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  • Public Library of Science  (20,535)
  • American Physical Society (APS)  (18,784)
  • Oxford University Press  (13,363)
  • American Geophysical Union
  • 2020-2024  (57)
  • 2015-2019  (59,945)
  • 2010-2014
  • 1995-1999
  • 2022  (57)
  • 2018  (59,945)
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  • 2020-2024  (57)
  • 2015-2019  (59,945)
  • 2010-2014
  • 1995-1999
  • 2020-2023  (107)
Year
  • 1
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    New Mediums, Better Messages? (2022)
    Oxford University Press
    Details
    Publication Date: 2022-11-18
    Description: The notion of development influences and is influenced by all aspects of human life. Social science is but one representational option among many for conveying the myriad ways in which development is conceived, encountered, experienced, justified, courted, and/or resisted by different groups at particular times and places. This wide-ranging collection from a diverse group of academic and non-academic authors engages with the broad field of development through twelve chapters that deal with music, theatre, fiction, photography, festivals, computer games, the arts, blogging, and other media. It explores three broad areas of alternative forms of knowledge about development, organized around the three themes of ‘translation’, ‘advocacy’, and ‘engagement’. The first of these is concerned with how popular representations of development can successfully compete with and complement formal social scientific representations; the second relates to the politics of popular representations of development, and the way that popular productions shape debates; and the third asks whether popular representations of development can generate alternative critiques that allow for the articulation of views that would be unacceptable to more orthodox means.
    Keywords: international development, popular representations of development, culture, translation, advocacy, arts and international development, media and development, development studies, festivals, music, theatre, fiction, photography, computer games, blogging, politics of representation, decolonizing knowledge ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCM Development economics & emerging economies ; bic Book Industry Communication::A The arts
    Language: English
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  • 2
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    Gauge Theory of Elementary Particle Physics (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-05
    Description: The aim of this book is to provide student and researcher with a practical introduction to some of the principal ideas in gauge theories and their applications to elementary particle physics. Elementary particle physics has made remarkable progress. We have a comprehensive theory of particle interactions. One can argue that it gives a complete and correct description of all non-gravitational physics. This theory is based on the principle of gauge symmetry. Strong, weak, and electromagnetic interactions are all gauge interactions. A knowledge of gauge theory is essential for anyone interested in modern high energy physics. Regardless of the ultimate correctness of every detail of this theory, it is the framework within which new theoretical and experimental advances will be interpreted in the foreseeable future.
    Keywords: Particle physics, relativistic quantum field theory, gauge symmetry, strong interactions, weak interactions, electromagnetic interactions, principles of locality, causality, renormalizability ; thema EDItEUR::P Mathematics and Science::PH Physics::PHN Nuclear physics
    Language: English
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  • 3
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    Chapter 17 Technology to Prevent Criminal Behavior (2022)
    Oxford University Press
    Details
    Publication Date: 2022-09-24
    Description: technology; prevent; criminal behavior
    Keywords: crime prevention; neurointerventions; neuroethics ; bic Book Industry Communication::J Society & social sciences::JK Social services & welfare, criminology::JKV Crime & criminology::JKVC Causes & prevention of crime
    Language: English
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  • 4
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    Sticky Power (2022)
    Oxford University Press
    Details
    Publication Date: 2022-09-13
    Description: Modern civilization revolves around money. However, money is a paradox. It is nothing more than a representation of and medium for decentralized networks of social trust, but its production is controlled by highly centralized networks of firms, places, and governments, and there is never enough of it to go around. Moreover, given that the creation of money, as credit, is based on expectations, money is at its heart an instrument for human agency to change the future. At the same time, however, the financial systems that produce money are deeply rooted in the past, and perpetuate themselves through history. This book seeks to deepen our understanding of the paradox of money, by introducing a novel conceptual lens—that of Global Financial Networks—to cast new light on the geography, history, politics, and sociology of finance from the middle ages to the global financial crisis and beyond. It shows that the power of finance is inherently “sticky”; with what are generally assumed to be new innovations such as “offshore” finance actually dating back centuries, and the architecture of global financial networks more broadly adapting to the rise and fall of empires and new technologies while changing surprisingly little in their basic character; or at most changing very slowly. A recognition of the mechanics of this durability, it is argued, calls for a new approach to reforming finance which is less reactively focused on regulation, and more proactively focused on building new institutional systems with a long-term “sticky power” of their own.
    Keywords: Financial geography, economic geography, economic history, international political economy, global financial networks, financial centers, financial and business services, offshore jurisdictions, financial innovation, financial institutions ; bic Book Industry Communication::K Economics, finance, business & management::KF Finance & accounting::KFF Finance ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCL International economics ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCZ Economic history
    Language: English
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  • 5
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    Chapter 1 Rethinking our Assumptions about Moral Status (2022)
    Oxford University Press | Rethinking Moral Status
    Details
    Publication Date: 2024-04-14
    Description: Recent technological developments and potential technological developments of the near future require us to try to think clearly about what it is to have moral status and about when and why we should attribute moral status to beings and entities. What should we say about the moral status of human non-human chimeras, human brain organoids, artificial intelligence, cyborgs, post-humans, and human minds that have been uploaded into a computer, or onto the internet? In this introductory chapter we survey some key assumptions ordinarily made about moral status that may require rethinking. These include the assumptions that all humans who are not severely cognitively impaired have equal moral status, that possession of the sophisticated cognitive capacities typical of human adults is necessary for full moral status, that only humans can have full moral status, and that there can be no beings with higher moral status than ordinary adult humans. We also need to consider how we should treat beings and entities when we find ourselves uncertain about their moral status.
    Keywords: artificial intelligence, cyborgs, human brain organoids, human non-human chimeras, moral uncertainty, moral status, post-humans, slavery, species membership, uploaded minds ; thema EDItEUR::U Computing and Information Technology::UY Computer science::UYQ Artificial intelligence
    Language: English
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  • 6
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    Social Mobility in Developing Countries (2022)
    Oxford University Press
    Details
    Publication Date: 2024-03-30
    Description: Social mobility is the hope of economic development and the mantra of a good society. There are disagreements about what constitutes social mobility, but there is broad agreement that people should have roughly equal chances of success regardless of their economic status at birth. Concerns about rising inequality have engendered a renewed interest in social mobility—especially in the developing world. However, efforts to construct the databases and meet the standards required for conventional analyses of social mobility are at a preliminary stage and need to be complemented by innovative, conceptual, and methodological advances. If forms of mobility have slowed in the West, then we might be entering an age of rigid stratification with defined boundaries between the always-haves and the never-haves—which does not augur well for social stability. Social mobility research is ongoing, with substantive findings in different disciplines—typically with researchers in isolation from each other. A key contribution of this book is the pulling together of the emerging streams of knowledge. Generating policy-relevant knowledge is a principal concern. Three basic questions frame the study of diverse aspects of social mobility in the book. How to assess the extent of social mobility in a given development context when the datasets by conventional measurement techniques are unavailable? How to identify drivers and inhibitors of social mobility in particular developing country contexts? How to acquire the knowledge required to design interventions to raise social mobility, either by increasing upward mobility or by lowering downward mobility?
    Keywords: Development economics & emerging economies; social mobility; welfare economics; economic growth ; thema EDItEUR::K Economics, Finance, Business and Management::KC Economics::KCM Development economics and emerging economies ; thema EDItEUR::J Society and Social Sciences::JB Society and culture: general::JBF Social and ethical issues::JBFQ Social mobility ; thema EDItEUR::K Economics, Finance, Business and Management::KC Economics::KCV Economics of specific sectors::KCVK Welfare economics
    Language: English
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  • 7
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    Global Legitimacy Crises (2022)
    Oxford University Press
    Details
    Publication Date: 2022-11-24
    Description: This book addresses the consequences of legitimacy in global governance, in particular asking: when and how do legitimacy crises affect international organizations (IOs) and their capacity to rule. The book starts with a new conceptualization of legitimacy crisis that looks at public challenges from a variety of actors. Based on this conceptualization, it applies a mixed-methods approach to identify and examine legitimacy crises, starting with a quantitative analysis of mass media data on challenges of a sample of 32 IOs. It shows that some, but not all organizations have experienced legitimacy crises, spread over several decades from 1985 to 2020. Following this, the book presents a qualitative study to further examine legitimacy crises of two selected case studies: the WTO and the UNFCCC. Whereas earlier research assumed that legitimacy crises have negative consequences, the book introduces a theoretical framework that privileges the activation inherent in a legitimacy crisis. It holds that this activation may not only harm an IO, but could also strengthen it, in terms of its material, institutional, and decision-making capacity. The following statistical analysis shows that whether a crisis has predominantly negative or positive effects depends on a variety of factors. These include the specific audience whose challenges define a certain crisis, and several institutional properties of the targeted organization. The ensuing in-depth analysis of the WTO and the UNFCCC further reveals how legitimacy crises and both positive and negative consequences are interlinked, and that effects of crises are sometimes even visible beyond the organizational borders.
    Keywords: legitimacy, legitimacy crises, global governance, international organizations, legitimacy audiences, effects of legitimacy, capacity to rule, liberal world order, UNFCCC, WTO ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPS International relations ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPS International relations::JPSN International institutions ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPH Political structure & processes::JPHV Political structures: democracy ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPA Political science & theory
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  • 8
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    Elementary Scattering Theory (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-05
    Description: The opportunities for doing scattering experiments at synchrotron and neutron facilities have grown rapidly in recent years and are set to continue to do so into the foreseeable future. This text provides a basic understanding of how these techniques enable the structure and dynamics of materials to be studied at the atomic and molecular level. Although mathematics cannot be avoided in a theoretical discussion, the aim has been to write a book that most scientists will still find approachable. To this end, the first two chapters are devoted to providing a tutorial background in the mathematics and physics that are implicitly assumed in other texts. Thereafter, the philosophy has been one of keeping things as simple as possible.
    Keywords: scattering experiments, synchrotron facilities, neutron facilities, dynamics of materials, structure of materials ; thema EDItEUR::P Mathematics and Science::PH Physics::PHF Materials / States of matter::PHFC Condensed matter physics (liquid state and solid state physics) ; thema EDItEUR::P Mathematics and Science::PN Chemistry::PNT Crystallography ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science
    Language: English
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  • 9
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    Policy Success in Canada (2022)
    Oxford University Press
    Details
    Publication Date: 2022-11-18
    Description: This book offers twenty-two in-depth case studies of public policies and programs of both provincial and federal governments in Canada that have been markedly successful. Using a common analytical framework, each case study describes the history and evolution of the policy, and assesses the extent of its programmatic, process, political and long-term success. Combined, the cases provide a unique collection of stories about instances in which Canadian institutions and policymakers actually worked as taxpayers would hope they always do. The volume provides a key and open access resource for teachers and researchers of both Canadian and comparative public policy.
    Keywords: Policy Success, Canada, Program success, Political success, Policymaking, Policy endurance ; bic Book Industry Communication::J Society & social sciences::JP Politics & government ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPA Political science & theory ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPQ Central government::JPQB Central government policies ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPP Public administration
    Language: English
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  • 10
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    Oxford Handbook of Philosophy and Disability (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-05
    Description: This Handbook introduces philosophers, as well as other scholars in the humanities and social sciences, to one of the most dynamic new areas of philosophical inquiry. Disability raises some of the deepest conceptual and normative issues about human embodiment and well-being; dignity, respect, justice and equality; and personal and social identity. But it also raises pressing practical questions for educational, health, reproductive, and technology policy, and confronts controversial questions about the scope and direction of the human and civil rights movements. The Handbook addresses these issues and more, with contributions from some of the most prominent philosophers in the field. The clarity it brings to these discussions demonstrates fully the continued centrality and importance of philosophical inquiry.
    Keywords: Philosophy, disability, human embodiment, social identity, normative, conceptual, dignity, human well-being, civil rights, human rights ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy
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  • 11
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    Comparative Policy Agendas (2022)
    Oxford University Press
    Details
    Publication Date: 2024-03-29
    Description: The Comparative Agendas Project (CAP) brings together data on government activities in over twenty countries, and provides a consistent categorizing system to understand when a given institution of government in a particular country took action on any issue of public policy. All topics are covered, comprehensively, over several decades, in some countries going back to World War II. Because of the open-data philosophy that animates the international network of scholars involved in the project and their meticulous attention to comparability and common data coding conventions, the databases of the CAP represent an unprecedented resource for the study of public policy across national borders. In this major new book, leaders of each national team provide the background and information needed for anyone to understand how best to make use of these newly available historical databases. Interested users will range from novice students of public policy to accomplished scholars, from interested citizens to professional journalists, political or partisan activists, and professional staff of legislative assemblies or national administrative agencies. The book’s sections include chapters introducing the CAP to a new audience, describing each national project, illustrating various cross-national uses and analyses that the CAP data allow, and concluding with ideas for further practical and research uses.
    Keywords: comparative public policy, comparative public administration, comparative legislative institutions, comparative media systems, comparative party systems, comparative politics, Comparative Agendas Project ; thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPA Political science and theory ; thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPB Comparative politics
    Language: English
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  • 12
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    Victims' State (2022)
    Oxford University Press | OUP USA
    Details
    Publication Date: 2024-04-04
    Description: Victims' State is the first integrated account of how Imperial Austria and the successor Austrian Republic responded to the needs of citizen-soldiers and their families in the age of mass politics and the First World War. It shows that compulsory military service and war mobilization changed the mission of the Austrian state and citizens' understanding of what they were entitled to, thus showing how war victim welfare was central to shaping modern European welfare state.
    Keywords: warfare-welfare nexus;Imperial Austria;Austrian First Republic;welfare state;First World War;disabled veteran;pension;conscription;war victim;social citizenship ; thema EDItEUR::N History and Archaeology::NH History::NHW Military history::NHWR Specific wars and campaigns::NHWR5 First World War ; thema EDItEUR::3 Time period qualifiers::3M c 1500 onwards to present day::3MP 20th century, c 1900 to c 1999::3MPB Early 20th century c 1900 to c 1950::3MPBF c 1910 to c 1919::3MPBFB c 1914 to c 1918 (World War One period) ; thema EDItEUR::N History and Archaeology::NH History::NHD European history ; thema EDItEUR::N History and Archaeology::NH History
    Language: English
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  • 13
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    The Digital Humanities and Literary Studies (2022)
    Oxford University Press
    Details
    Publication Date: 2024-03-27
    Description: This book delivers an introduction and overview of developing intersections between digital methods and literary studies. The Digital Humanities and Literary Studies serves as a starting place for those who wish to learn more about the possibilities, and the limitations, of the oft-touted digital humanities in the literary space. The volume engages with the proponents of digital humanities and its detractors alike, aiming to offer a fair and balanced perspective on this controversial topic. The book combines a survey and background approach with original literary research and, therefore, straddles the divide between seasoned digital experts and interested newcomers.
    Keywords: literary studies; literature; history; criticism; ethical & social aspects of IT ; thema EDItEUR::D Biography, Literature and Literary studies::DS Literature: history and criticism::DSB Literary studies: general ; thema EDItEUR::D Biography, Literature and Literary studies::D Biography, Literature and Literary studies::DS Literature: history and criticism ; thema EDItEUR::U Computing and Information Technology::UB Information technology: general topics::UBJ Digital and information technologies: social and ethical aspects
    Language: English
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  • 14
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    Vulnerability and the Politics of Care (2022)
    Oxford University Press
    Details
    Publication Date: 2024-03-30
    Description: Vulnerability is a fundamental aspect of existence, giving rise to the need for care in various forms. Yet we are not all vulnerable in the same way, and not all vulnerabilities are equally recognised or cared for. This transdisciplinary volume considers how vulnerability and care are shaped by relations of power within contemporary contexts of war, development, environmental degradation, sexual violence, aging populations and economic precarity. It proposes that care for vulnerable populations or individuals is inseparable from other political processes of recognition, welfare, healthcare and security, whilst also exploring vulnerability as a shared, generative condition that makes caring possible. Ethnographic and narrative accounts of vulnerable life and caring relations in various geographical regions - including Japan, Uganda, Micronesia, Iraq, Mexico, the UK and the US - are interspersed with perspectives from philosophy, International Relations, social and cultural theory, and more, resulting in a compelling series of intellectual exchanges, creative frictions and provocative insights.
    Keywords: health; politics
    Language: English
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  • 15
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    New Models for Managing Longevity Risk (2022)
    Oxford University Press
    Details
    Publication Date: 2022-03-10
    Description: Notwithstanding the terrible price the world has paid in the Coronavirus pandemic, the fact remains that longevity at older ages is likely to continue to rise in the medium and longer term. This volume explores how the private and public sectors can collaborate via public-private partnerships (PPPs) to develop new mechanisms to reduce older people’s risk of outliving their assets in later life. As we show in this volume, PPPs typically involve shared government financing alongside private-sector partner expertise, management responsibility, and accountability. In addition to offering empirical evidence on examples where this is working well, our contributors provide case studies, discuss survey results, and examine a variety of different financial and insurance products to better meet the needs of the aging population. The volume will be informative to researchers, plan sponsors, students, and policymakers seeking to enhance retirement plan offerings.
    Keywords: Longevity risk, public-private partnerships, retirement, pension, security ; bic Book Industry Communication::K Economics, finance, business & management::KF Finance & accounting::KFF Finance::KFFP Pensions ; bic Book Industry Communication::K Economics, finance, business & management::KN Industry & industrial studies::KNS Service industries::KNST Financial services industry ; bic Book Industry Communication::J Society & social sciences::JH Sociology & anthropology::JHB Sociology::JHBD Population & demography
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  • 16
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    Open Source Law, Policy and Practice (2022)
    Oxford University Press
    Details
    Publication Date: 2022-12-03
    Description: This book examines various policies, including the legal and commercial aspects of the Open Source phenomenon. Here, ‘Open Source’ is adopted as convenient shorthand for a collection of diverse users and communities, whose differences can be as great as their similarities. The common thread is their reliance on, and use of, law and legal mechanisms to govern the source code they write, use, and distribute. The central fact of open source is that maintaining control over source code relies on the existence and efficacy of intellectual property (‘IP’) laws, particularly copyright law. Copyright law is the primary statutory tool that achieves the end of openness, although implemented through private law arrangements at varying points within the software supply chain. This dependent relationship is itself a cause of concern for some philosophically in favour of ‘open’, with some predicting (or hoping) that the free software movement will bring about the end of copyright as a means for protecting software.
    Keywords: open source, free software, intellectual property, copyright law, source code, private law, software supply, object code ; bic Book Industry Communication::L Law::LN Laws of Specific jurisdictions::LNQ IT & Communications law::LNQD Data protection law ; bic Book Industry Communication::L Law::LN Laws of Specific jurisdictions::LNQ IT & Communications law ; bic Book Industry Communication::L Law::LN Laws of Specific jurisdictions::LNR Intellectual property law
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  • 17
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    The Digital Continent (2022)
    Oxford University Press
    Details
    Publication Date: 2023-03-03
    Description: Only ten years ago, there were more internet users in countries like France or Germany than in all of Africa put together. But much has changed in a decade. The year 2018 marks the first year in human history in which a majority of the world’s population are now connected to the internet. This mass connectivity means that we have an internet that no longer connects only the world’s wealthy. Workers from Lagos to Johannesburg to Nairobi and everywhere in between can now apply for and carry out jobs coming from clients who themselves can be located anywhere in the world. Digital outsourcing firms can now also set up operations in the most unlikely of places in order to tap into hitherto disconnected labour forces. With CEOs in the Global North proclaiming that ‘location is a thing of the past’ (Upwork, 2018), and governments and civil society in Africa promising to create millions of jobs on the continent, the book asks what this ‘new world of digital work’ means to the lives of African workers. It draws from a year-long fieldwork in South Africa, Kenya, Nigeria, Ghana, and Uganda, with over 200 interviews with participants including gig workers, call and contact centre workers, self-employed freelancers, small-business owners, government officials, labour union officials, and industry experts. Focusing on both platform-based remote work and call and contact centre work, the book examines the job quality implications of digital work for the lives and livelihoods of African workers.
    Keywords: gig economy, outsourcing, digital work, labour, job quality, precarity, flexibility, labour agency, Africa ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCM Development economics & emerging economies ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCL International economics ; bic Book Industry Communication::R Earth sciences, geography, environment, planning::RG Geography::RGC Human geography::RGCM Economic geography ; bic Book Industry Communication::1 Geographical Qualifiers::1H Africa
    Language: English
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  • 18
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    Middle English Medical Recipes and Literary Play, 1375-1500 (2022)
    Oxford University Press
    Details
    Publication Date: 2024-03-27
    Description: This volume is the first detailed, book-length study of Middle English medical recipes in their literary, imaginative, social, and codicological contexts. Analysing recipe collections in over seventy late medieval manuscripts, this book explores how the words and structures of recipes could contribute to those texts’ healing purpose, but could also confuse, impede, exceed, and redefine that purpose. The study therefore presents a challenge to recipes’ traditional reputation as mundane, unartful texts written and read solely for the sake of directing practical action. Crucially, it also relocates these neglected texts and overlooked manuscripts within the complex networks forming medieval textual culture, demonstrating that—though marginalized in modern scholarship—medical recipes were actually linguistically, formally, materially, and imaginatively interconnected with many other late medieval discourses, including devotional writings, romances, fabliaux, and Chaucerian poetry. The monograph thus models for readers modes of analysis and close reading that might be deployed in relation to recipes in order to understand better their allusive, fragmentary, and playful qualities as well as their wide-ranging influence on medieval imaginations.
    Keywords: recipes, remedies, medicine, Middle English, poetry, networks, imagination, close reading, play, fragments ; thema EDItEUR::D Biography, Literature and Literary studies::DS Literature: history and criticism::DSB Literary studies: general::DSBB Literary studies: ancient, classical and medieval ; thema EDItEUR::M Medicine and Nursing::MB Medicine: general issues::MBX History of medicine ; thema EDItEUR::3 Time period qualifiers::3K CE period up to c 1500::3KL c 1000 CE to c 1500
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  • 19
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    Chapter 11 Watchful Waiting (2022)
    Oxford University Press
    Details
    Publication Date: 2024-03-31
    Description: This paper opens up the relationship between vulnerability and the temporalities of care. It takes ‘care’ as not just a material practice that supports, manages and sustains vulnerable bodies, but as a temporal practice, one that produces time in situations that are otherwise felt to be stuck or ‘chronic’. It draws on some co-written anecdotes about the use of ‘watchful waiting’ by medical practitioners working in general practice in the UK’s National Health System (NHS) to think through the meanings of waiting in relation to chronic health and mental health crises. The offer of ‘watchful waiting’ as a response to ‘chronic crisis’ becomes a test case for understanding a more general condition of watchful waiting as a form of care, in a context in which waiting for healthcare has become an agony for many, experienced as a form of abandonment or a key sign of health service failure. The paper attempts to re-think ‘waiting times’ within a wider history of the temporalities of care, in order to elucidate the ways an offer of waiting can itself be understood as a response to vulnerability through a practice of staying with or alongside the chronic temporalities of others.
    Keywords: Temporality, waiting, care, crisis, mental health, general practice, NHS ; thema EDItEUR::M Medicine and Nursing::MB Medicine: general issues::MBP Health systems and services::MBPK Mental health services
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  • 20
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    Citizens, Elites, and the Legitimacy of Global Governance (2022)
    Oxford University Press
    Details
    Publication Date: 2022-11-18
    Description: Contemporary society has witnessed major growth in global governance, yet the legitimacy of global governance remains deeply in question. This book offers the first full comparative investigation of citizen and elite legitimacy beliefs toward global governance. Empirically, it provides a comprehensive analysis of public and elite opinion toward global governance, building on two uniquely coordinated surveys covering multiple countries and international organizations. Theoretically, it develops an individual-level approach, exploring how a person’s characteristics in respect of socioeconomic status, political values, geographical identification, and domestic institutional trust shape legitimacy beliefs toward global governance. The book’s central findings are threefold. First, there is a notable and general elite–citizen gap in legitimacy beliefs toward global governance. While elites on average hold moderately high levels of legitimacy toward international organizations, the general public is decidedly more skeptical. Second, individual-level differences in interests, values, identities, and trust dispositions provide significant drivers of citizen and elite legitimacy beliefs toward global governance, as well as the gap between the two groups. Most important on the whole are differences in the extent to which citizens and elites trust domestic political institutions, which shape how these groups assess the legitimacy of international organizations. Third, both patterns and sources of citizen and elite legitimacy beliefs vary across organizations and countries. These variations suggest that institutional and societal contexts condition attitudes toward global governance. The book’s findings shed light on future opportunities and constraints in international cooperation, suggesting that current levels of legitimacy point neither to a general crisis of global governance nor to a general readiness for its expansion.
    Keywords: global governance, international organizations, legitimacy, confidence, trust, citizens, elites, public opinion, elite opinion, International Criminal Court, International Monetary Fund, United Nations, World Bank, World Health Organization, World Trade Organization ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPS International relations ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPA Political science & theory ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPH Political structure & processes
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    Topics of Thought (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-08
    Description: This book concerns mental states such as thinking that Obama is tall, imagining that there will be a climate change catastrophe, knowing that one is not a brain in a vat, or believing that Martina Navratilova is the greatest tennis player ever. Such states are usually understood as having intentionality, that is, as being about things or situations to which the mind is directed. The contents of such states are often taken to be propositions. The book presents a new framework for the logic of thought, so understood—an answer to the question: Given that one thinks (believes, knows, etc.) something, what else must one think (ditto) as a matter of logic? This should depend on the propositions which make for the contents of the relevant thoughts. And the book defends the idea that propositions should be individuated hyperintensionally, i.e. not just by the sets of worlds at which they are true (as in standard ‘intensional’ possible worlds semantics), but also by what they are about: their topic or subject matter. Thus, the logic of thought should be ‘topic-sensitive’. After the philosophical foundations have been presented in Chapters 1−2, Chapter 3 develops a theory of Topic-Sensitive Intentional Modals (TSIMs): modal operators representing attitude ascriptions, which embed a topicality or subject matter constraint. Subsequent chapters explore applications ranging from mainstream epistemology (dogmatism, scepticism, fallibilism: Chapter 4), to the nature of suppositional thinking and imagination (Chapter 5), conditional belief and belief revision (Chapter 6), framing effects (Chapter 7), probabilities and indicative conditionals (Chapter 8).
    Keywords: Modal logic, Epistemic logic, Conditional logic, Hyperintensionality, Subject matters, Suppositional thought, Imagination, Belief revision, Framing effects, Indicative conditionals ; bic Book Industry Communication::H Humanities::HP Philosophy::HPL Philosophy: logic ; bic Book Industry Communication::H Humanities::HP Philosophy::HPK Philosophy: epistemology & theory of knowledge ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy::QDT Topics in philosophy::QDTL Philosophy: logic ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy::QDT Topics in philosophy::QDTK Philosophy: epistemology and theory of knowledge
    Language: English
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    Neutron Interferometry (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-05
    Description: Quantum mechanics is a part of physics where experiment and theory are inseparably intertwined. This general theme permeates the 2nd edition of this book. It discusses more than 40 neutron interferometry experiments along with their theoretical motivations and explanations. The basic ideas and results of interference experiments related to coherence and decoherence of matter waves and certain post-selection variations, gravitationally induced quantum phase shifts, Berry’s geometrical phases, spinor symmetry and spin superposition, and Bell’s inequalities are all discussed in this book. Both the scalar and vector Aharonov-Bohm topological interference effects and the neutron version of the Sagnac effect are presented in a self-contained and pedagogical way. Interferometry with perfect crystals, artificial lattices, and spin-echo systems are described in some detail. The book includes the theoretical underpinning as well as connections to other areas of experimental physics, such as quantum optics, nuclear physics, gravitation, and atom interferometry. The observed phase shifts due to the Earth’s gravity and rotation indicate a close connection to relativity theory. Neutron interferometry can be considered as a central technique of quantum optics with massive particles. It has stimulated the development of interferometry with atoms, molecules, and clusters. Quantum interference experiments with massive particles have direct consequences on the discussion of epistemological questions since they show explicitly the wave-particle duality, and the entanglement and the contextuality of various parameters governing our modern view of nature.
    Keywords: interferometry, neutrons, coherence, quantum mechanics, wave packets, spinor symmetry, quantum contextuality, AB effects, COW experiment, wave-particle duality, dynamical diffraction theory ; thema EDItEUR::P Mathematics and Science::PH Physics::PHM Atomic and molecular physics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHJ Optical physics
    Language: English
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    Algorithmic Reason (2022)
    Oxford University Press
    Details
    Publication Date: 2022-09-06
    Description: Are algorithms ruling the world today? Is artificial intelligence making life-and-death decisions? Are social media companies able to manipulate elections? As we are confronted with public and academic anxieties about unprecedented changes, this book offers a different analytical prism to investigate these transformations as more mundane and fraught. Aradau and Blanke develop conceptual and methodological tools to understand how algorithmic operations shape the government of self and other. While disperse and messy, these operations are held together by an ascendant algorithmic reason. Through a global perspective on algorithmic operations, the book helps us understand how algorithmic reason redraws boundaries and reconfigures differences. The book explores the emergence of algorithmic reason through rationalities, materializations, and interventions. It traces how algorithmic rationalities of decomposition, recomposition, and partitioning are materialized in the construction of dangerous others, the power of platforms, and the production of economic value. The book shows how political interventions to make algorithms governable encounter friction, refusal, and resistance. The theoretical perspective on algorithmic reason is developed through qualitative and digital methods to investigate scenes and controversies that range from mass surveillance and the Cambridge Analytica scandal in the UK to predictive policing in the US, and from the use of facial recognition in China and drone targeting in Pakistan to the regulation of hate speech in Germany. Algorithmic Reason offers an alternative to dystopia and despair through a transdisciplinary approach made possible by the authors’ backgrounds, which span the humanities, social sciences, and computer sciences.
    Keywords: algorithms, governmentality, big data, artificial intelligence, politics, difference, self/other, friction, refusal, resistance ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPA Political science & theory ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPS International relations ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPV Political control & freedoms ; bic Book Industry Communication::U Computing & information technology::UM Computer programming / software development::UMB Algorithms & data structures ; bic Book Industry Communication::U Computing & information technology::UY Computer science::UYQ Artificial intelligence
    Language: English
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    Political Settlements and Development (2022)
    Oxford University Press
    Details
    Publication Date: 2022-09-06
    Description: Few concepts have captured the imagination of the conflict and development communities in recent years as powerfully as the idea of a ‘political settlement’. At its most ambitious, ‘political settlements analysis’ (PSA) promises to explain why conflicts occur and states collapse, the conditions for their successful rehabilitation, different developmental pathways from peace, and how to better fit development policy to country context. Yet despite the meteoric rise of the term and its tremendous promise, not all is well in the world of PSA. Rival definitions of the concept abound; there are disagreements about its scope and the way it should be used; a growing schism between conflict specialists and economists; basic concepts are ambiguous; and little progress has been made on measurement. This book consequently has three main aims. The first is to argue for a revised definition of a political settlement, capable of unifying its diverse strands. The second is to put the concept on a more solid theoretical and scientific footing, providing a method for measuring and categorizing political settlements, using both qualitative case studies and a large-n statistical analysis to illustrate its potential. And the third is to examine the implications of the findings for mainstream social science analysis and for policymakers.
    Keywords: Government Policy, Provision and Effects of Welfare Programmes, Economic Development, Development Planning and Policy, Rent-Seeking, Lobbying, Elections, Legislatures, and Voting Behavior, Bureaucracy, Administrative Processes in Public Organizations, Corruption, Conflict, Conflict Resolution, Alliances, Revolutions, Positive Analysis of Policy Formulation and Implementation, Political Economy ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCP Political economy ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCM Development economics & emerging economies ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCS Economic systems & structures
    Language: English
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    Perceptual Experience (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-08
    Description: This book offers an account of perceptual experience—its intrinsic nature, its engagement with the world, its relations to mental states of other kinds, and its role in epistemic norms. One of the book’s main claims is that perceptual experience constitutively involves representations of worldly items. A second claim is that the relevant form of representation can be explained in broadly biological terms. After defending these foundational doctrines, the book proceeds to give an account of perceptual appearances and how they are related to the objective world. Appearances turn out to be relational, viewpoint dependent properties of external objects. There is also a complementary account of how the objects that possess these properties are represented. Another major concern is the phenomenological dimension of perception. The book maintains that perceptual phenomenology can be explained reductively in terms of the representational contents of experiences, and it uses this doctrine to undercut the traditional arguments for dualism. This treatment of perceptual phenomenology is then expanded to encompass cognitive phenomenology, the phenomenology of moods and emotions, and the phenomenology of pain. The next topic is the various forms of consciousness that perceptual experience can possess. A principal aim is to show that phenomenology is metaphysically independent of these forms of consciousness, and another is to de-mystify the form known as phenomenal consciousness. The book concludes by discussing the relations of various kinds that perceptual experiences bear to higher level cognitive states, including relations of format, content, and justification or support.
    Keywords: perception, experience, representation, teleosemantics, appearance, phenomenology, pain, consciousness, iconic representation, epistemic justification ; bic Book Industry Communication::H Humanities::HP Philosophy::HPJ Philosophy: metaphysics & ontology ; bic Book Industry Communication::H Humanities::HP Philosophy::HPM Philosophy of mind ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy::QDT Topics in philosophy::QDTJ Philosophy: metaphysics and ontology ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy::QDT Topics in philosophy::QDTM Philosophy of mind
    Language: English
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    The Black Book of Quantum Chromodynamics (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-05
    Description: The LHC (Large Hadron Collider) will serve as the energy frontier for high-energy physics for the next 20 years. The highlight of the LHC running so far has been the discovery of the Higgs boson, but the LHC programme has also consisted of the measurement of a myriad of other Standard Model processes, as well as searches for Beyond-the-Standard-Model physics, and the discrimination between possible new physics signatures and their Standard Model backgrounds. Essentially all of the physics processes at the LHC depend on quantum chromodynamics, or QCD, in the production, or in the decay stages, or in both. This book has been written as an advanced primer for physics at the LHC, providing a pedagogical guide for the calculation of QCD and Standard Model predictions, using state-of-the-art theoretical frameworks. The predictions are compared to both the legacy data from the Tevatron, as well as the data obtained thus far from the LHC, with intuitive connections between data and theory supplied where possible. The book is written at a level suitable for advanced graduate students, and thus could be used in a graduate course, but is also intended for every physicist interested in physics at the LHC.
    Keywords: LHC, Tevatron, QCD, Standard Model, Higgs boson, W/Z bosons, jets, parton showers, resummation, parton distribution functions ; thema EDItEUR::P Mathematics and Science::PH Physics::PHQ Quantum physics (quantum mechanics and quantum field theory) ; thema EDItEUR::P Mathematics and Science::PH Physics::PHP Particle and high-energy physics ; thema EDItEUR::P Mathematics and Science::PH Physics
    Language: English
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    The Challenges of Technology and Economic Catch-up in Emerging Economies (2022)
    Oxford University Press
    Details
    Publication Date: 2022-09-13
    Description: This book synthesizes and interprets existing knowledge on technology upgrading failures as well as lessons from successes and failures in order to better understand the challenges of technology upgrading in emerging economies. The objective is to bring together in one volume diverse evidence regarding three major dimensions of technology upgrading: paths of technology upgrading, structural changes in the nature of technology upgrading, and the issues of technology transfer and technology upgrading. The knowledge of these three dimensions is being synthesized at the firm, sector, and macro levels across different countries and world macro-regions. Compared to the old and new challenges and uncertainties facing emerging economies, our understanding of the technology upgrading is sparse, unsystematic, and scattered. While our understanding of these issues from the 1980s and 1990s is relatively more systematized, the changes that took place during the globalization and proliferation of GVCs, the effects of the post-2008 events, and the effects of the current COVID-19 and geopolitical struggles on technology upgrading have not been explored and compared synthetically. Moreover, the recent growth slowdown in many emerging economies, often known as a middle-income trap, has reinforced the importance of understanding the technology upgrading challenges of catching-up economies. We believe that the time is ripe for “taking stock of the area” in order to systematize and evaluate the existing knowledge on processes of technology upgrading of emerging economies at the firm, sector, and international levels and to make further inroads in research on this issue. This volume aims to significantly contribute towards this end.
    Keywords: technological capabilities, technology upgrading, global value chain, middle-income trap, emerging economies, innovation and economic growth, technology transfer, economic catching-up ; bic Book Industry Communication::K Economics, finance, business & management::KJ Business & management::KJD Business innovation ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCG Economic growth ; bic Book Industry Communication::K Economics, finance, business & management::KJ Business & management::KJM Management & management techniques::KJMV Management of specific areas::KJMV3 Knowledge management
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    The Spirit of Global Health (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-08
    Description: Since the beginning of the World Health Organization, many of its staff members, regional offices, Member States, and directors-general have grappled with the question of what a ‘spiritual dimension’ of health looks like, and how it might enrich the health policies advocated by their organization. Contrary to the widespread perception that ‘spirituality’ is primarily related to palliative care and has emerged relatively recently within the WHO, this book shows that its history is considerably longer and more complex, and has been closely connected to the organization’s ethical aspirations, its quest for more holistic and equitable healthcare, and its struggle with the colonial legacy of international health organizations. Such ideals and struggles silently motivated many of its key actors and policies—such as the provision of universal primary healthcare—which for decades have embodied the organization’s loftiest aspirations. The WHO’s official relationship with ‘spirituality’ advanced in fits, leaps, and setbacks. At times creative and interdisciplinary, at others deeply political, this process was marked by cycles of institutional forgetting and remembering. Rather than a triumph of religious lobbyists, this book argues, the ‘spiritual dimension’ of health may be better understood as a ‘ghost’ that has haunted—and continues to haunt—the WHO as it comes to terms with its mandate of advancing health as a state of ‘complete well-being’ available to all.
    Keywords: religion, spirituality, global health, World Health Organization, United Nations, primary healthcare, healthcare reform, social determinants of health ; bic Book Industry Communication::H Humanities::HR Religion & beliefs::HRA Religion: general::HRAM Religious issues & debates::HRAM3 Religion & science ; bic Book Industry Communication::H Humanities::HR Religion & beliefs::HRA Religion: general::HRAM Religious issues & debates::HRAM2 Religion & politics ; bic Book Industry Communication::H Humanities::HR Religion & beliefs::HRA Religion: general::HRAX History of religion ; bic Book Industry Communication::M Medicine::MB Medicine: general issues::MBX History of medicine ; thema EDItEUR::Q Philosophy and Religion::QR Religion and beliefs::QRA Religion: general::QRAM Religious issues and debates::QRAM3 Religion and science ; thema EDItEUR::Q Philosophy and Religion::QR Religion and beliefs::QRA Religion: general::QRAM Religious issues and debates::QRAM2 Religion and politics ; thema EDItEUR::Q Philosophy and Religion::QR Religion and beliefs::QRA Religion: general::QRAX History of religion ; thema EDItEUR::M Medicine and Nursing::MB Medicine: general issues::MBX History of medicine
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    Bad Beliefs (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-08
    Description: Why do people come to reject climate science or the safety and efficacy of vaccines, in defiance of the scientific consensus? A popular view explains bad beliefs like these as resulting from a range of biases that together ensure that human beings fall short of being genuinely rational animals. This book presents an alternative account. It argues that bad beliefs arise from genuinely rational processes. We’ve missed the rationality of bad beliefs because we’ve failed to recognize the ubiquity of the higher-order evidence that shapes beliefs, and the rationality of being guided by this evidence. The book argues that attention to higher-order evidence should lead us to rethink both how minds are best changed and the ethics of changing them: we should come to see that nudging—at least usually—changes belief (and behavior) by presenting rational agents with genuine evidence, and is therefore fully respectful of intellectual agency. We needn’t rethink Enlightenment ideals of intellectual autonomy and rationality, but we should reshape them to take account of our deeply social epistemic agency.
    Keywords: belief, evidence, rationality, autonomy, nudging ; bic Book Industry Communication::H Humanities::HP Philosophy::HPK Philosophy: epistemology & theory of knowledge ; bic Book Industry Communication::H Humanities::HP Philosophy::HPQ Ethics & moral philosophy ; bic Book Industry Communication::H Humanities::HP Philosophy::HPS Social & political philosophy ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy::QDT Topics in philosophy::QDTK Philosophy: epistemology and theory of knowledge ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy::QDT Topics in philosophy::QDTQ Ethics and moral philosophy ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy::QDT Topics in philosophy::QDTS Social and political philosophy
    Language: English
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    The Oxford Handbook of Digital Ethics (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-08
    Description: digital ethics
    Keywords: digital ethics ; bic Book Industry Communication::H Humanities::HP Philosophy ; bic Book Industry Communication::H Humanities::HP Philosophy::HPQ Ethics & moral philosophy ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy::QDT Topics in philosophy::QDTQ Ethics and moral philosophy
    Language: English
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    The Politics of Distributing Social Transfers (2022)
    Oxford University Press
    Details
    Publication Date: 2022-09-06
    Description: This book provides a systematic analysis of the political processes shaping the distribution of social transfers in six countries in sub-Saharan Africa and South Asia. In doing so, the book addresses a notable gap in recent research on social protection concerning the politics of implementation. While considerable attention has been devoted to debating the merits of different policy designs and the political factors shaping the adoption and diffusion of different policy models, ultimately the ability of any social transfer programme to deliver on its promises is dependent on the effective implementation and distribution of social transfers in line with intended objectives. The chapters in this book examine international and sub-national variation in programme implementation in Bangladesh, Ethiopia, Ghana, Kenya, Nepal, and Rwanda, drawing on a common analytical framework that highlights the importance of state capacity and reach, rooted in histories of state formation, and contemporary political competition in shaping the distribution of social transfers. Comparative analysis of the case studies supports the view that variation in the capacity and reach of the state within countries is a centrally important factor shaping the effectiveness and impartiality of distribution. Yet state capacity alone is insufficient. Rather, political competition and power relations shape how this capacity is actually deployed in practice. As such, the book underscores the inherently political nature of implementation and questions common technocratic efforts to improve implementation by de-politicizing the social protection policy process.
    Keywords: social protection, social transfer, policy implementation, political economy, power relations, state capacity, Africa, South Asia ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCP Political economy ; bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFF Social issues & processes ; bic Book Industry Communication::G Reference, information & interdisciplinary subjects::GT Interdisciplinary studies::GTF Development studies ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics::KCM Development economics & emerging economies
    Language: English
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    Movements After Revolution (2022)
    Oxford University Press
    Details
    Publication Date: 2022-07-16
    Keywords: Agrarian Movement;Communism;Communist Party;Labor Movement;Land Reform;Latin America;Mexican Revolution;Modern Mexico;People’s Movement;Popular Movement ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPW Political activism::JPWQ Revolutionary groups & movements ; bic Book Industry Communication::H Humanities::HB History
    Language: English
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    Chapter Disabilities and wellbeing (2022)
    Oxford University Press | Oxford Handbook of Philosophy and Disability
    Details
    Publication Date: 2024-04-05
    Description: This chapter argues for a normative distinction between disabilities that are inherently negative with respect to wellbeing and disabilities that are inherently neutral with respect to wellbeing. First, after clarifying terms I discuss recent arguments according to which possession of a disability is inherently neutral with respect to wellbeing. I note that though these arguments are compelling, they are only intended to cover certain disabilities, and in fact there exists a broad class regarding which they do not apply. In section three I discuss two such problem cases: Locked-in Syndrome and the Minimally Conscious State. In section four I explain why these are cases in which possession of the disability makes one worse off overall. I do so by explicating the notion of control over one’s situation. I argue that disabilities that significantly impair control over one’s own situation – e.g., Locked-in Syndrome and the Minimally Conscious State – strongly tend to be inherently negative with respect to wellbeing, while disabilities that do not strongly tend to be inherently neutral. The upshot is that we must draw an important normative distinction between disabilities that undermine this kind of control, and disabilities that do not.
    Keywords: wellbeing, Minimally Conscious State, Locked-in Syndrome, control over one’s situation ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy
    Language: English
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    Particle Physics in the LHC era (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-05
    Description: This book gives a modern introduction to particle physics. The main mathematical tools required for the rest of the book are developed in Chapter 2. A quantitative introduction to accelerator physics is presented in Chapter 3. Chapter 4 covers detector physics, with an emphasis on fundamental physical principles. Chapter 5 covers the static quark model, with applications to light mesons and baryons as well as heavier states containing charm and beauty quarks. Chapter 6 introduces relativistic quantum mechanics and uses spinors to relate Lorentz invariance to the Dirac equation. Chapter 7 covers the basics of the electroweak theory based on broken SU(2) × U(1) symmetry. Chapter 8 reviews some of the key experiments that led to the development of the electroweak theory. Chapter 9 explains the importance of deep inelastic scattering data for providing direct evidence for the existence of quarks. It also gives a brief introduction to quantum chromodynamics (QCD). Chapter 10 considers flavour oscillations in the quark sector and then discusses the evidence for CP violation. Chapter 11 examines the theory of neutrino oscillations as well as the evidence for these oscillations. Chapter 12 gives an elementary introduction to the Higgs mechanism as well as a careful explanation of the experimental evidence for the existence of a Higgs boson. Chapter 13 looks at LHC physics and explains how searches for Beyond the Standard Model Physics are performed. It concludes with a discussion of the evidence for dark matter and dark energy.
    Keywords: Particle physics, nuclear physics, astrophysics, cosmology, accelerator physics, detector physics, quarks and leptons, Dirac equation, electroweak theory, quantum chromodynamics, flavour oscillations, CP violation, Higgs boson, Beyond the Standard Model physics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHP Particle and high-energy physics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHN Nuclear physics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHV Applied physics::PHVB Astrophysics ; thema EDItEUR::P Mathematics and Science::PG Astronomy, space and time::PGK Cosmology and the universe ; thema EDItEUR::P Mathematics and Science::PH Physics::PHM Atomic and molecular physics
    Language: English
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    A Featural Typology of Bantu Agreement (2022)
    Oxford University Press
    Details
    Publication Date: 2024-03-24
    Description: The Bantu languages are in some sense remarkably uniform (SVO basic word order, noun classes, verbal morphology), but this extensive language family also show a wealth of morphosyntactic variation. Two core areas in which such variation is attested are subject and object agreement. The book explores the variation in Bantu subject and object marking on the basis of data from 75 Bantu languages, discovering striking patterns (the RANDOM and the AWSOM correlation), and providing a novel syntactic analysis. This analysis takes into account not just phi agreement, but also nominal licensing and information structure. A Person feature, associated with animacy, definiteness, or givenness, is shown to be responsible for differential object agreement, while at the same time accounting for doubling vs. non-doubling object marking – a hybrid solution to an age-old debate in Bantu comparative morphosyntax. It is furthermore proposed that low functional heads can Case-license flexibly downwards or upwards, depending on the relative topicality of the two arguments involved. This accounts for the properties of symmetric object marking in ditransitives (for Appl), and subject inversion constructions (for v). By keeping Agree constant and systematically determining which featural parameters are responsible for the attested variation, the proposed analysis argues for an emergentist view of features and parameters (following Biberauer 2018, 2019), and against both Strong Uniformity and Strong Modularity.
    Keywords: Bantu languages, agreement, Agree, comparative morphosyntax, Case, information structure, nominal licensing, Person, Topic, subject marking, object marking, crosslinguistic variation ; thema EDItEUR::C Language and Linguistics::CF Linguistics::CFK Grammar, syntax and morphology ; thema EDItEUR::C Language and Linguistics::CF Linguistics::CFF Historical and comparative linguistics ; thema EDItEUR::2 Language qualifiers::2H African languages::2HC Niger-Congo languages::2HCB Bantu languages
    Language: English
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    How to Achieve Inclusive Growth (2022)
    Oxford University Press
    Details
    Publication Date: 2024-03-30
    Description: Rising inequality and widespread poverty, social unrest and polarization, gender and ethnic disparities, declining social mobility, economic fragility, unbalanced growth due to technology and globalization, and existential danger from climate change are urgent global concerns of our day. These issues are intertwined. They therefore require a holistic framework to examine their interplay and bring the various strands together. This book brings together leading academic economists and experts from several international institutions to explain the sources and scale of these challenges. The book summarizes a wide array of empirical evidence and country experiences, lays out practical policy solutions, and devises a comprehensive and unified plan of action for combatting these economic and social disparities. This authoritative book is accessible to policy makers, students, and the general public interested in how to craft a brighter future by building a sustainable, green, and inclusive society in the years ahead.
    Keywords: Inclusive growth, growth, inequality, equality, poverty, development, climate change, disparities, income distribution, economic policy ; thema EDItEUR::K Economics, Finance, Business and Management::KC Economics ; thema EDItEUR::K Economics, Finance, Business and Management::KC Economics::KCV Economics of specific sectors::KCVG Environmental economics ; thema EDItEUR::K Economics, Finance, Business and Management::KC Economics::KCG Economic growth ; thema EDItEUR::K Economics, Finance, Business and Management::KC Economics::KCA Economic theory and philosophy
    Language: English
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    Bell Nonlocality (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-05
    Description: Nonlocality was discovered by John Bell in 1964, in the context of the debates about quantum theory, but is a phenomenon that can be studied in its own right. Its observation proves that measurements are not revealing pre-determined values, falsifying the idea of “local hidden variables” suggested by Einstein and others. One is then forced to make some radical choice: either nature is intrinsically statistical and individual events are unspeakable, or our familiar space-time cannot be the setting for the whole of physics. As phenomena, nonlocality and its consequences will have to be predicted by any future theory, and may possibly play the role of foundational principles in these developments. But nonlocality has found a role in applied physics too: it can be used for “device-independent” certification of the correct functioning of random number generators and other devices. After a self-contained introduction to the topic, this monograph on nonlocality presents the main tools and results following a logical, rather than a chronological, order.
    Keywords: Nonlocality, Bell’s theorem, John Bell, quantum entanglement, Einstein-Podolsky-Rosen, device-independent, quantum foundations, local hidden variables, local realism, spooky action ; thema EDItEUR::P Mathematics and Science::PH Physics::PHQ Quantum physics (quantum mechanics and quantum field theory) ; thema EDItEUR::P Mathematics and Science::PH Physics::PHP Particle and high-energy physics ; thema EDItEUR::U Computing and Information Technology::UY Computer science
    Language: English
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    Rethinking Moral Status (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-14
    Description: Common-sense morality implicitly assumes that reasonably clear distinctions can be drawn between the ‘full’ moral status usually attributed to ordinary adult humans, the partial moral status attributed to non-human animals, and the absence of moral status, usually ascribed to machines and other artefacts. These assumptions were always subject to challenge; but they now come under renewed pressure because there are beings we are now able to create, and beings we may soon be able to create, which blur traditional distinctions between humans, non-human animals, and non-biological beings. Examples are human non-human chimeras, cyborgs, human brain organoids, post-humans, human minds that have been uploaded into computers and onto the internet, and artificial intelligence. It is far from clear what moral status we should attribute to any of these beings. While commonsensical views of moral status have always been questioned, the latest technological developments recast many of the questions and raise additional objections. There are a number of ways we could respond, such as revising our ordinary suppositions about the prerequisites for full moral status. We might also reject the assumption that there is a sharp distinction between full and partial moral status. The present volume provides a forum for philosophical reflection about the usual presuppositions and intuitions about moral status, especially in light of the aforementioned recent and emerging technological advances.
    Keywords: morality, moral status, chimera, cyborg, human brain organoid, post human, non-human animal, artificial intelligence ; thema EDItEUR::U Computing and Information Technology::UY Computer science::UYQ Artificial intelligence
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    The Changing German Voter (2022)
    Oxford University Press
    Details
    Publication Date: 2022-06-11
    Description: Over the past half century, the behavior of German voters has changed profoundly—at first rather gradually but during the last decade at accelerated speed. Electoral decision-making has become much more volatile, rendering election outcomes less predictable. Party system fragmentation intensified sharply. The success of the Alternative for Germany (AfD) put an end to Germany’s exceptionality as one of the few European countries without a strong right-wing populist party. Utilizing a wide range of data compiled by the German Longitudinal Election Study, the book examines changing voters’ behavior in the context of changing parties, campaigns, and media during the period of its hitherto most dramatically increased fluidity at the 2009, 2013, and 2017 federal elections. Guided by the notions of realignment and dealignment, the study addresses three questions: How did the turbulences that increasingly characterize German electoral politics come about? How did they in turn condition voters’ decision-making? How were voters’ attitudes and choices affected by situational factors that pertained to the specifics of particular elections? The book demonstrates how traditional cleavages lost their grip on voters and a new socio-cultural line of conflict became the dominant axis of party competition. A series of major crises, but also programmatic shifts of the established parties promoted this development. It led to a segmentation of the party system that pits the right-wing populist AfD against the traditional parties. The book also demonstrates the relevance of coalition preferences, candidate images as well as media and campaign effects for voters’ attitudes, beliefs, and preferences.
    Keywords: Germany, electoral behavior, electoral change, party system development, realignment, dealignment, party competition, socio-economic conflict dimension, socio-cultural conflict dimension, right-wing populism ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPA Political science & theory ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPB Comparative politics ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPH Political structure & processes::JPHF Elections & referenda ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPH Political structure & processes ; bic Book Industry Communication::1 Geographical Qualifiers::1D Europe::1DF Central Europe::1DFG Germany
    Language: English
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    Future Morality (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-05
    Description: The world is changing so fast that it's hard to know how to think about what we ought to do. We barely have time to reflect on how scientific advances will affect our lives before they're upon us. New kinds of dilemma are springing up. Can robots be held responsible for their actions? Will artificial intelligence be able to predict criminal activity? Is the future gender-fluid? Should we strive to become post-human? Should we use drugs to improve our intimate relationships — or to reduce crime? Our intuitions about questions like these are often both weak and confused. David Edmonds has put together a philosophical task force to get to grips with these challenges. Twenty-nine philosophers present provocative and engaging pieces about aspects of life today, and life tomorrow — birth and death, health and medicine, brain and body, personal relationships, wrongdoing and justice, the internet, animals, and the environment. The future won't look the same when you've finished this book.
    Keywords: philosophy; moral philosophy; social & political philosophy ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy
    Language: English
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    Voices in Psychosis (2022)
    Oxford University Press
    Details
    Publication Date: 2022-09-10
    Description: Voices in Psychosis: Interdisciplinary Perspectives deepens and extends the understanding of hearing voices in psychosis in a striking way. For the first time, this collection brings multiple disciplinary, clinical and experiential perspectives to bear on an original and extraordinarily rich body of testimony: transcripts of forty in-depth phenomenological interviews conducted with people who hear voices and who have accessed Early Intervention in Psychosis services. Voice-hearing experiences associated with psychosis are highly varied, frequently distressing, poorly understood, and deeply stigmatized, even within mental health services. Voices in Psychosis responds to the urgent need for new ways of listening to and making sense of these experiences. The book addresses the social, clinical and research contexts in which the interviews took place, thoroughly investigating the embodied, multisensory, affective, linguistic, spatial, and relational qualities of voice-hearing experiences. The nature, politics, and consequences of these analytic endeavours is a focus of critical reflection throughout. This volume presents a collection of essays by members and associates of the Hearing the Voice project that were written in response to the transcripts. Each chapter gives a multifaceted insight into the experiences of voice-hearers in the North East of England and to their wider resonance in contexts ranging from medieval mysticism to Amazonian shamanism, from the nineteenth-century novel to the twenty-first-century survivor movement.
    Keywords: voice-hearing, phenomenology, interdisciplinarity, psychosis, mental health services, trauma ; bic Book Industry Communication::J Society & social sciences::JM Psychology::JMP Abnormal psychology ; bic Book Industry Communication::J Society & social sciences::JM Psychology::JMQ Psychology: emotions ; bic Book Industry Communication::J Society & social sciences::JM Psychology::JMS The self, ego, identity, personality ; bic Book Industry Communication::M Medicine::MM Other branches of medicine::MMH Psychiatry ; bic Book Industry Communication::J Society & social sciences::JK Social services & welfare, criminology::JKS Social welfare & social services::JKSM Care of the mentally ill
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    Dancing the World Smaller (2022)
    Oxford University Press
    Details
    Publication Date: 2024-03-24
    Description: This book examines international dance performances in New York City in the 1940s as sites in which dance artists and audiences contested what it meant to practice globalism in mid-twentieth-century America. Debates over globalism in dance proxied larger cultural struggles over how to reconcile the nation’s new role as a global superpower. In dance as in cultural politics, Americans labored over how to realize diversity while honoring difference and manage dueling impulses toward globalism, on the one hand, and isolationism, on the other.
    Keywords: Performing arts, dance, ballet, modern dance, world dance, dance, globalism, internationalism, modernism, ethnic, ethnologic, New York City, 1940s, mid-century, mid-twentieth century ; thema EDItEUR::A The Arts::AT Performing arts::ATQ Dance ; thema EDItEUR::A The Arts::AT Performing arts::ATX Other performing arts
    Language: English
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    Public Law and Economics (2022)
    Oxford University Press
    Details
    Publication Date: 2023-03-03
    Description: This comprehensive textbook applies economic analysis to public law. The economic analysis of law has revolutionized legal scholarship and teaching in the last half-century, but it has focused mostly on private law, business law, and criminal law. This book extends the analysis to fundamental topics in public law, such as the separation of government powers, regulation by agencies, constitutional rights, and elections. Every public law involves six fundamental processes of government: bargaining, voting, entrenching, delegating, adjudicating, and enforcing. The book devotes two chapters to each process, beginning with the economic theory and then applying the theory to a wide range of puzzles and problems in law. Each chapter concentrates on cases and legal doctrine, showing the relevance of economics to the work of lawyers and judges. Featuring lucid, accessible writing and engaging examples, the book addresses enduring topics in public law as well as modern controversies, including gerrymandering, voter identification laws, and qualified immunity for police.
    Keywords: law and economics, interpretive economics, constitutional economics, economics of rights, economics of bargaining, economics of voting, economics of entrenchment, economics of delegation, economics of adjudication, economics of enforcement ; bic Book Industry Communication::L Law::LB International law::LBB Public international law ; bic Book Industry Communication::K Economics, finance, business & management::KC Economics ; bic Book Industry Communication::L Law::LB International law
    Language: English
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    Sacred Rivals (2022)
    Oxford University Press | OUP USA
    Details
    Publication Date: 2024-04-08
    Description: France;Algeria;Ottoman Syria;Islam;Catholicism;Catholic Orientalism;Imperialism;Missions;Jesuits;Louis Veuillot;Melchior de Vogüé;Charles Lavigerie;White Fathers;Humanitarianism;Œuvre d'Orient;Civilizing Mission
    Keywords: France;Algeria;Ottoman Syria;Islam;Catholicism;Catholic Orientalism;Imperialism;Missions;Jesuits;Louis Veuillot;Melchior de Vogüé;Charles Lavigerie;White Fathers;Humanitarianism;Œuvre d'Orient;Civilizing Mission ; bic Book Industry Communication::H Humanities::HR Religion & beliefs::HRA Religion: general::HRAX History of religion ; bic Book Industry Communication::H Humanities::HB History::HBJ Regional & national history::HBJD European history ; bic Book Industry Communication::H Humanities::HB History::HBT History: specific events & topics::HBTQ Colonialism & imperialism ; thema EDItEUR::Q Philosophy and Religion::QR Religion and beliefs::QRA Religion: general::QRAX History of religion ; thema EDItEUR::N History and Archaeology::NH History::NHD European history ; thema EDItEUR::N History and Archaeology::NH History::NHT History: specific events and topics::NHTQ Colonialism and imperialism
    Language: English
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    Chapter (When) Is Adblocking Wrong? (2022)
    Oxford University Press
    Details
    Publication Date: 2022-11-22
    Description: In this chapter, I examine three deontological objections to adblocking: the objection from property (according to which adblocking involves accessing another’s property without satisfying the conditions placed on such access by the owner), the objection from complicity (according to which, by blocking ads, consumers become complicit in wrongdoing of adblocking software providers), and the objection from freeriding (according to which adblocking consumers free-ride on other consumers who allow ads to be served). I argue that, though these objections plausibly establish the moral impermissibility of some instances of adblocking, they do not, even collectively, establish a blanket moral prohibition on adblocking, as it is currently done.
    Keywords: Adblocking, Piracy, Theft, Intellectual Property, Complicity, Extortion, Free-Riding ; bic Book Industry Communication::L Law::LN Laws of Specific jurisdictions::LNR Intellectual property law
    Language: English
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    Empires and Communities in the Post-Roman and Islamic World, c. 400 – 1000 CE (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-01
    Description: This book deals with the ways in which empires affect smaller communities – for instance, ethnic groups, religious communities, local or peripheral populations. It addresses Byzantinium, the early Islamic World and the West in the 5th to 10th centuries CE, a period with a particular dynamic of imperial formation and decline in Europe and the Mediterranean.
    Description: Dieser Band beschäftigt sich mit den Auswirkungen von Imperien auf kleinere Gemeinschaften – zum Beispiel ethnische verbände, religiöse Gemeinschaften, lokale oder periphere Bevölkerungen. Behnadelt werden Byzanz, die frühislamische Welt und der Westen im 5.-10. Jahrhundert n. Chr., eine Zeit von besonders dynamischen Prozessen von Neubildung und verfall von Imperien in Europa und dem Mittelmeeraum.
    Keywords: Imperien – Geschichte – vor 1500; Zivilisation, mittelalterliche; Mittelalter; Islamisches Imperium, Geschichte; Ethnizität, Geschichte, bis 1500; Ost und West ; ÖFOS 2012, Byzantinistik ; ÖFOS 2012, Globalgeschichte ; ÖFOS 2012, Islam ; Imperialism—History—To 1500; Civilization, Medieval; Middle Ages; Islamic Empire—History; Ethnicity—History—To 1500; East and West (nach LCSH) ; ÖFOS 2012, Byzantine studies ; ÖFOS 2012, Global history ; ÖFOS 2012, Islam ; thema EDItEUR::N History and Archaeology ; thema EDItEUR::3 Time period qualifiers::3K CE period up to c 1500 ; thema EDItEUR::N History and Archaeology::NH History::NHD European history ; thema EDItEUR::N History and Archaeology::NH History::NHG Middle Eastern history
    Language: English
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    Sick Note (2022)
    Oxford University Press
    Details
    Publication Date: 2024-04-02
    Description: Sick Note is a history of how the British state asked, ‘who is really sick?’ Tracing medical certification for absence from work from 1948 to 2010, it shows that doctors, employers, employees, politicians, media commentators, and citizens each concerned themselves with measuring sickness. At various times, each understood that a signed note from a doctor was not enough to ‘prove’ whether someone was ‘really’ sick. Yet, with no better alternative on offer, the sick note survived in practice and in the popular imagination—just like the welfare state itself. Sick Note reveals the interplay between medical, employment, and social security policy. The physical note became an integral part of working and living in Britain, while the term ‘sick note’ was often deployed rhetorically as a mocking nickname or symbol of Britain’s economic and political troubles. Using government policy documents, popular media, internet archives, and contemporary research, this book covers the evolution of medical certification and the welfare state since the Second World War, demonstrating how sickness and disability policies responded to demographic and economic changes—though not always satisfactorily for administrators or claimants. Moreover, despite the creation of ‘the fit note’ in 2010, the idea of ‘the sick note’ has remained. With the specific challenges posed by the global pandemic in the early 2020s, Sick Note shows how the question of ‘who is really sick?’ has never been straightforward and will continue to perplex the British state.
    Keywords: history, welfare, United Kingdom, social security, medicine, employment, absenteeism, disability, politics ; thema EDItEUR::N History and Archaeology::NH History::NHD European history ; thema EDItEUR::N History and Archaeology ; thema EDItEUR::3 Time period qualifiers::3M c 1500 onwards to present day ; thema EDItEUR::N History and Archaeology::NH History::NHT History: specific events and topics::NHTB Social and cultural history ; thema EDItEUR::M Medicine and Nursing::MB Medicine: general issues::MBX History of medicine
    Language: English
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    India in the Persian World of Letters (2022)
    Oxford University Press
    Details
    Publication Date: 2024-03-24
    Description: This study traces the development of philology (the analysis of literary language) in the Persian tradition in India, concentrating on its socio-political ramifications. The most influential Indo-Persian philologist of the eighteenth century was Sirāj al-Dīn ʿAlī Ḳhān (d. 1756), whose pen-name was Ārzū. Besides being a respected poet, Ārzū was a rigorous theoretician of language whose intellectual legacy was side-lined by colonialism. His conception of language accounted for literary innovation and historical change in part to theorize the tāzah-goʾī [literally, “fresh-speaking”] movement in Persian literary culture. Although later scholarship has tended to frame this debate in anachronistically nationalist terms (Iranian native speakers versus Indian imitators), the primary sources show that contemporary concerns had less to do with geography than with the question of how to assess innovative “fresh-speaking” poetry, a situation analogous to the Quarrel of the Ancients and the Moderns in early modern Europe. Ārzū used historical reasoning to argue that as a cosmopolitan language Persian could not be the property of one nation or be subject to one narrow kind of interpretation. Ārzū also shaped attitudes about reḳhtah, the Persianized form of vernacular poetry that would later be renamed and reconceptualized as Urdu, helping the vernacular to gain acceptance in elite literary circles in northern India. This study puts to rest the persistent misconception that Indians started writing the vernacular because they were ashamed of their poor grasp of Persian at the twilight of the Mughal Empire.
    Keywords: Persian, Indo-Persian, Urdu, philology, Sirāj al-Dīn ʿAlī Ḳhān Ārzū, tāzah-goʾī, vernacularization, literary culture, early modern, Mughal Empire ; thema EDItEUR::C Language and Linguistics::CB Language: reference and general::CBX Language: history and general works ; thema EDItEUR::D Biography, Literature and Literary studies::DC Poetry::DCF Poetry by individual poets ; thema EDItEUR::D Biography, Literature and Literary studies::DS Literature: history and criticism::DSC Literary studies: poetry and poets ; thema EDItEUR::C Language and Linguistics::CF Linguistics::CFF Historical and comparative linguistics ; thema EDItEUR::3 Time period qualifiers::3M c 1500 onwards to present day::3ML 18th century, c 1700 to c 1799
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    Moderately warm upper mantle beneath the Tristan da Cunha Hotspot, from Rayleigh-wave dispersion and petrological modeling (2018)
    American Geophysical Union
    In:  EPIC3Geochemistry, Geophysics, Geosystems, American Geophysical Union, (19), pp. 1412-1428
    Details
    Publication Date: 2018-07-15
    Description: Understanding the enigmatic intraplate volcanism in the Tristan da Cunha region requires knowledge of the temperature of the lithosphere and asthenosphere beneath it. We measured phasevelocity curves of Rayleigh waves using cross-correlation of teleseismic seismograms from an array of ocean-bottom seismometers around Tristan, constrained a region-average, shear-velocity structure, and inferred the temperature of the lithosphere and asthenosphere beneath the hotspot. The ocean-bottom data set presented some challenges, which required data-processing and measurement approaches different from those tuned for land-based arrays of stations. Having derived a robust, phase-velocity curve for the Tristan area, we inverted it for a shear wave velocity profile using a probabilistic (Markov chain Monte Carlo) approach. The model shows a pronounced low-velocity anomaly from 70 to at least 120 km depth. VS in the low velocity zone is 4.1–4.2 km/s, not as low as reported for Hawaii (�4.0 km/s), which probably indicates a less pronounced thermal anomaly and, possibly, less partial melting. Petrological modeling shows that the seismic and bathymetry data are consistent with a moderately hot mantle (mantle potential temperature of 1,410–1,4308C, an excess of about 50–1208C compared to the global average) and a melt fraction smaller than 1%. Both purely seismic inversions and petrological modeling indicate a lithospheric thickness of 65–70 km, consistent with recent estimates from receiver functions. The presence of warmer-than-average asthenosphere beneath Tristan is consistent with a hot upwelling (plume) from the deep mantle. However, the excess temperature we determine is smaller than that reported for some other major hotspots, in particular Hawaii.
    Repository Name: EPIC Alfred Wegener Institut
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    Genomic Observatories Network: socio-technical perspectives on the path to long-term multi-omic observation (2018)
    American Geophysical Union
    In:  EPIC3American Geophysical Union Fall Meeting, Washington D.C., USA, 2018-12-10-2018-12-14American Geophysical Union
    Details
    Publication Date: 2020-02-12
    Description: Four years after the Genomic Observatories Network was formally established as a collaboration between the Group on Earth Observations Biodiversity Observation Network and the Genomic Standards Consortium, we review the development of the network. Considering institutional infrastructure, we note the growing role of omic observation in active and increasingly interlinked marine networks, with examples such as EMBRC/ASSEMBLE, International Long Term Ecological Research Network, AtlantOS, National Association of Marine Labs, Smithsonian MarineGEO, and Partnership on Observation of the Global Oceans. We also note some key human elements essential to meeting the networks' goals, address how the community is evolving, and why performing seemingly simple tasks within a broadly distributed community presents significant challenges even among those who have agreed to use standards. From the perspectives above, we review lessons learned from use cases that leverage Genomic Observatories Network, such as the Autonomous Reef Monitoring Structures (ARMS), Ocean Sampling Day (OSD) and myOSD, which included experiences with citizen science. Looking forward, we survey 1) promising new technologies for in situ biological observation (e.g., cheap 3D printed omics samplers), 2) progress towards adoption of omics methods in marine policy and conservation programs, and 3) opportunities that a Genomic Observatory brings, alone or embedded in a network, to address novel scientific questions and support Essential Biodiversity Variables, Essential Ocean Variables, and indices such as the Ocean Health Index. Given the data intensive nature of omics investigation, we note emerging cyberinfrastructure solutions, such as the Genomic Observatories Metadatabase (GeOMe), an open-access repository for geographic and ecological metadata associated with biosamples, and predictive modeling efforts, such as those of the Island Digital Ecosystem Avatar (IDEA) Consortium. Finally, we explore the potential of Genomic Observatories as components of high-resolution calibration sites. Such observatories would provide super-contextualized "data trusts" for machine learning and artificial intelligence applications that draw on multi-omic observation.
    Repository Name: EPIC Alfred Wegener Institut
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    Managing the Evolution and Sustainability of Best Practices Across Ocean Science (2018)
    American Geophysical Union
    In:  EPIC32018 Ocean Sciences Meeting, Portland, Oregon, USA, 2018-02-11-2018-02-16American Geophysical Union
    Details
    Publication Date: 2020-02-12
    Description: Target audience: All ocean scientists who wish to share or discover best practice documents in their domain. Background: A working group convened under the AtlantOS project and including partners from ODIP, IODE, JCOMM, IEEE, and AWI is currently developing new technologies and approaches for handling best practices (BPs) across ocean science. The goal of the working group is to create a sustained repository for BPs, to ease their propagation and adoption. Goals: After briefly describing its work, the BP working group will engage town hall participants in a discussion on 1) how best to find and centrally archive BPs in participants' disciplines and 2) what capacities a central archive of BPs would need to help participants create, discover, share, and archive their BPs. The participant input gathered will be used to further the development of a multidisciplinary repository for BPs and better harmonise ocean observation.
    Repository Name: EPIC Alfred Wegener Institut
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    The first known virus isolates from Antarctic sea ice have complex infection patterns (2018)
    Oxford University Press
    In:  EPIC3FEMS Microbiology Ecology, Oxford University Press, 94(4), pp. 1-15, ISSN: 1574-6941
    Details
    Publication Date: 2018-11-09
    Repository Name: EPIC Alfred Wegener Institut
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    Contribution of Convection-Induced Heat Flux to Winter Ice Decay in the Western Nansen Basin (2018)
    American Geophysical Union
    In:  EPIC3Journal of Geophysical Research: Oceans, American Geophysical Union, ISSN: 2169-9275
    Details
    Publication Date: 2018-09-20
    Description: Gradually decaying Arctic sea ice changes the boundary conditions at the surface, separating ocean and atmosphere. In recent years, substantial reductions in sea ice during winter have been observed in the Atlantic sector of the Arctic Ocean, which forms the gateway for warm water inflow from the midlatitudes. In this study, we used routine output from the Mercator Ocean global operational system (MOGOS) to assess the efficiency of winter thermohaline convection transporting heat from deep layers to the ocean surface along the Atlantic origin water (AW) pathway, between Svalbard and Franz Joseph Land in the Nansen Basin. Positive temperature extremes in the AW layer in midwinter promote favorable prerequisite conditions for deep‐reaching thermohaline convection, with explicit signs captured by the MOGOS. Balance equations with several assumptions for the compact region around the position (81.30°N, 31°E) of the long‐term (2004–2010) mooring demonstrated that winter heat loss at the ocean surface is mainly compensated by convective heat flux from the AW layer. Heat and salt fluxes, associated with horizontal advection, are compatible with convective fluxes, while contribution of ice formation/melt is substantially smaller. Conclusion about the dominant role of vertical convection in shaping thermohaline structure and reducing sea ice in winter is supported by correlation analysis of the MOGOS output and mooring‐based measurements. Unfavorable background conditions (thick and consolidated sea ice in combination with specific directions of ice drift) may significantly alter convection development, as demonstrated for two sequential years with substantially different external forcing.
    Repository Name: EPIC Alfred Wegener Institut
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    Crustal structure of the Ionian basin and eastern Sicily margin: results from a wide-angle seismic survey (2018)
    American Geophysical Union
    Details
    Publication Date: 2019-03-26
    Description: In the Ionian Sea (Central Mediterranean) the slow convergence between Africa and Eurasia results in the formation of a narrow subduction zone. The nature of the crust of the subducting plate remains debated and could represent the last remnants of the Neo-Tethys ocean. The origin of the Ionian basin is also under discussion, especially concerning the rifting mechanisms as the Malta Escarpment could represent a remnant of this opening. This subduction retreat toward the south-east (motion occurring since the last 35 Ma) but is confined to the narrow Ionian Basin. A major lateral slab tear fault is required to accommodate the slab roll-back. This fault is thought to propagate along the eastern Sicily margin but its precise location remains controversial. This study focuses on the deep crustal structure of the Eastern-Sicily margin and the Malta Escarpment. We present two two-dimensional P-wave velocity models obtained from forward modeling of wide-angle seismic data acquired onboard the R/V Meteor during the DIONYSUS cruise in 2014. The results image an oceanic crust within the Ionian basin as well as the deep structure of the Malta Escarpment, which presents characteristics of a transform margin. A deep and asymmetrical sedimentary basin is imaged south of the Messina strait and seems to have opened between the Calabrian and Peloritan continental terranes. The interpretation of the velocity models suggests that the tear fault is located east of the Malta Escarpment, along the Alfeo fault system (AFS).
    Description: The DIONYSUS cruise is funded through the Deutsche Forschungsgemeinschaft DFG.
    Description: Published
    Description: 2090-2114
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Keywords: Crustal structure ; Subduction ; Crustal structure of the Ionian basin and eastern Sicily margin: results from a wide-angle seismic survey.
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Phase Equilibria of Pantelleria Trachytes (Italy): Constraints on Pre-eruptive Conditions and on the Metaluminous to Peralkaline Transition in Silicic Magmas (2018)
    Oxford University Press
    Details
    Publication Date: 2018-09-20
    Description: The relationships between trachytes and peralkaline rhyolites (i.e. pantellerites and comendites), which occur in many continental rift systems, oceanic islands and continental intraplate settings, is unclear. To fill this gap, we have performed phase equilibrium experiments on two representative metaluminous trachytes from Pantelleria to determine both their pre-eruptive equilibration conditions (pressure, temperature, H2O content and redox state) and liquid lines of descent. Experiments were performed in the temperature range 750–950 C, pressure 0 5–1 5 kbar and fluid saturation conditions with XH2O [¼H2O/(H2OþCO2)] ranging between zero and unity. Redox conditions were fixed below the nickel–nickel oxide buffer (NNO). The results show that at 950 C and melt water contents (H2Omelt) close to saturation, trachytes are at liquidus conditions at all pressures. Clinopyroxene is the liquidus phase, being followed by iron-rich olivine and alkali feldspar. Comparison of experimental and natural phases (abundances and compositions) yields the following pre-eruptive conditions: P¼160 5 kbar, T¼925625 C, H2Omelt¼261wt %, and fO2 between NNO– 0 5 and NNO– 2. A decrease in temperature from 950 C to 750 C, as well as of H2Omelt, promotes a massive crystallization of alkali feldspar to over 80 wt %. Iron-bearing minerals show gradual iron enrichment when T and fO2 decrease, trending towards the compositions of the phenocrysts of natural pantellerites. Despite the metaluminous character of the bulk-rock compositions, residual glasses obtained after 80 wt % crystallization evolve toward comenditic compositions, owing to profuse alkali feldspar crystallization, which decreases the Al2O3 of the melt, leading to a consequent increase in the peralkalinity index [PI¼molar (Na2OþK2O)/Al2O3]. This is the first experimental demonstration that peralkaline felsic derivatives can be produced by low-pressure fractional crystallization of metaluminous mafic magmas. Our results show that the pantelleritic magmas of basalt–trachyte–rhyolite igneous suites require at least 95 wt % of parental basalt crystallization, consistent with trace element evidence. Redox conditions, through their effect on Fe–Ti oxide stabilities, control the final iron content of the evolving melt.
    Description: Published
    Description: 559- 588
    Description: 2V. Struttura e sistema di alimentazione dei vulcani
    Description: JCR Journal
    Keywords: peralkaline silicic magmatism ; Pantelleria ; Green Tuff ; petrology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Experimental detection of upward going cosmic particles and consequences for correction of density radiography of volcanoes (2018)
    American Geophysical Union
    Details
    Publication Date: 2018-02-16
    Description: Muon tomography measures the flux of cosmic muons crossing geological bodies to determine their density. The telescopes used to perform measurements are exposed to noise fluxes with high intensities relative to the tiny flux of interest. We give experimental evidences of a so far never described source of noise caused by a flux of upward going particles. Data acquired on La Soufrière of Guadeloupe and Mount Etna reveal that upward going particles are detected only when the rear side of the telescope is exposed to a wide volume of atmosphere located below the altitude of the telescope and with a rock obstruction less than several tens of meters. Biases produced on density muon radiographies by upward going fluxes are quantified, and correction procedures are applied to radiographies of La Soufrière.
    Description: Published
    Description: 6334–6339
    Description: 2V. Struttura e sistema di alimentazione dei vulcani
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Evolution of Conduit Geometry and Eruptive Parameters During Effusive Events (2018)
    American Geophysical Union
    Details
    Publication Date: 2019-11-22
    Description: The dynamics of effusive events is controlled by the interplay between conduit geometry and source conditions. Dyke‐like geometries have been traditionally assumed for describing conduits during effusive eruptions, but their depth‐dependent and temporal modifications are largely unknown. We present a novel model which describes the evolution of conduit geometry during effusive eruptions by using a quasi steady state approach based on a 1‐D conduit model and appropriate criteria for describing fluid shear stress and elastic deformation. This approach provides time‐dependent trends for effusion rate, conduit geometry, exit velocity, and gas flow. Fluid shear stress leads to upward widening conduits, whereas elastic deformation becomes relevant only during final phases of effusive eruptions. Simulations can reproduce different trends of effusion rate, showing the effect of magma source conditions and country rock properties on the eruptive dynamics. This model can be potentially applied for data inversion in order to study specific case studies.
    Description: Published
    Description: 7471-7480
    Description: 5V. Processi eruttivi e post-eruttivi
    Description: JCR Journal
    Keywords: Magma ascent ; Effusive eruption ; Conduit geometry ; 04.08. Volcanology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Rates of coastal destruction in areas of tabular ground ice occurrence in the western Russian Arctic (2018)
    American Geophysical Union
    In:  EPIC3American Geophysical Union Fall Meeting, Washington D.C., USA, 2018-12-10-2018-12-14Washington D.C., American Geophysical Union
    Details
    Publication Date: 2018-12-23
    Description: Tabular ground ice bodies are widely spread on Eurasian and North American Arctic plains. Exposed tabular ground ice in coastal bluffs favors the activation of thermal abrasion and thermal denudation, which in turn causes increasing coastal destruction rates. Thermo-denudation under conditions of ground ice exposures includes thawing of ice and frozen sediments along retreating headwalls of retrogressive thaw slumps and their constant enlargement. Thermo-cirques and thermo-terraces are two basic landform types that either feature channelized or broad open outlets, depending on the initial ice body outcrop by the denudation processes inland or in the retreating coastal bluffs. We study key-sites on Kolguev Island (Barents Sea) and on Yugorsky Peninsula (Kara Sea), continuing and extending earlier research efforts on coastal dynamics in the region. New data on thermo-denudation and thermo-abrasion rates for these key-sites have been obtained using a set of multi-temporal satellite images of high and very-high spatial resolution covering the period from 2002 to 2016. For orthorectification purposes of imagery collected prior to TanDEM-X acquisitions, we used an edited version of the 12 m TanDEM-X DEM. Along erosive coastline segments the former relief situation was reconstructed through extrapolation of coastal bluff edge elevation values and restoration of the coastal plain relief towards the sea. On the western coast of Kolguev Island, average coastal bluff retreat rates between 2002 and 2012 varied from 1.7 to 2.4 m/year, while averaged rates of thermo-cirques headwalls retreat were 2.6 m/year. Maximum rates at some sections increased up to 14.5-15.1 m/year in the recent past. High rates of thermo-denudation increase were not only observed on western Kolguev Island, but also on the Yugorsky Peninsula, were rates raised up to 13 m/year in recent years. Activation of thermo-denudation is also noted in other parts of Kara Sea coasts and were generally correlated with changing environmental factors, particularly expressed in an increase on the thaw index during recent years.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev , info:eu-repo/semantics/conferenceObject
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    The impact of Southern Ocean circulation on the global carbon cycle and Antarctic ice shelf stability (2018)
    American Geophysical Union
    In:  EPIC3AGU Fall Meeting 2018, Washington DC, 2018-12-10-2018-12-14Washington DC, American Geophysical Union
    Details
    Publication Date: 2019-01-06
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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    Graphical user interface for interactive seismic ray tracing (2018)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Eos 86 (2005): 90, doi:10.1029/2005EO090004.
    Description: RayGUI 2.0 is a new version of RayGUI, a graphical user interface (GUI) to the seismic travel time modeling program of Zelt and Smith [1992]. It represents a significant improvement over the previous version of RayGUI (RayGUI 1.04; Loss et al.[1998a,1998b]).
    Repository Name: Woods Hole Open Access Server
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    Light control of G protein signaling pathways by a novel photopigment (2018)
    Public Library of Science
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in PLoS One 13 (2018): e0205015, doi:10.1371/journal.pone.0205015.
    Description: Channelopsins and photo-regulated ion channels make it possible to use light to control electrical activity of cells. This powerful approach has lead to a veritable explosion of applications, though it is limited to changing membrane voltage of the target cells. An enormous potential could be tapped if similar opto-genetic techniques could be extended to the control of chemical signaling pathways. Photopigments from invertebrate photoreceptors are an obvious choice—as they do not bleach upon illumination -however, their functional expression has been problematic. We exploited an unusual opsin, pScop2, recently identified in ciliary photoreceptors of scallop. Phylogenetically, it is closer to vertebrate opsins, and offers the advantage of being a bi-stable photopigment. We inserted its coding sequence and a fluorescent protein reporter into plasmid vectors and demonstrated heterologous expression in various mammalian cell lines. HEK 293 cells were selected as a heterologous system for functional analysis, because wild type cells displayed the largest currents in response to the G-protein activator, GTP-γ-S. A line of HEK cells stably transfected with pScop2 was generated; after reconstitution of the photopigment with retinal, light responses were obtained in some cells, albeit of modest amplitude. In native photoreceptors pScop2 couples to Go; HEK cells express poorly this G-protein, but have a prominent Gq/PLC pathway linked to internal Ca mobilization. To enhance pScop2 competence to tap into this pathway, we swapped its third intracellular loop—important to confer specificity of interaction between 7TMDRs and G-proteins—with that of a Gq-linked opsin which we cloned from microvillar photoreceptors present in the same retina. The chimeric construct was evaluated by a Ca fluorescence assay, and was shown to mediate a robust mobilization of internal calcium in response to illumination. The results project pScop2 as a potentially powerful optogenetic tool to control signaling pathways.
    Description: This work was funded by Colciencias grant FP44842-010-2015 and Connecticut Fund for Science.
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    Shipboard design and fabrication of custom 3D-printed soft robotic manipulators for the investigation of delicate deep-sea organisms (2018)
    Public Library of Science
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in PLos One 13 (2018): e0200386, doi:10.1371/journal.pone.0200386.
    Description: Soft robotics is an emerging technology that has shown considerable promise in deep-sea marine biological applications. It is particularly useful in facilitating delicate interactions with fragile marine organisms. This study describes the shipboard design, 3D printing and integration of custom soft robotic manipulators for investigating and interacting with deep-sea organisms. Soft robotics manipulators were tested down to 2224m via a Remotely-Operated Vehicle (ROV) in the Phoenix Islands Protected Area (PIPA) and facilitated the study of a diverse suite of soft-bodied and fragile marine life. Instantaneous feedback from the ROV pilots and biologists allowed for rapid re-design, such as adding “fingernails”, and re-fabrication of soft manipulators at sea. These were then used to successfully grasp fragile deep-sea animals, such as goniasterids and holothurians, which have historically been difficult to collect undamaged via rigid mechanical arms and suction samplers. As scientific expeditions to remote parts of the world are costly and lengthy to plan, on-the-fly soft robot actuator printing offers a real-time solution to better understand and interact with delicate deep-sea environments, soft-bodied, brittle, and otherwise fragile organisms. This also offers a less invasive means of interacting with slow-growing deep marine organisms, some of which can be up to 18,000 years old.
    Description: This work is supported by NOAA OER Grant # NA17OAR0110083 “Exploration of the Seamounts of the Phoenix Islands Protected Area” to RDR, EEC, TMS and DFG and Schmidt Ocean Institute Grant: “What is the Current State of the Deep-Sea Coral Ecosystem in the Phoenix Island Protected Area?” to EEC, RDR, TMS and DFG; NSF Instrument Development for Biological Research Award # 1556164 to RJW and #1556123 to DFG; the National Academies Keck Futures Initiative of the National Academy of Sciences under award #NAKFI DBS21 to RJW and DFG; and NFS Research Fellowship awarded to KPB (#DGE1144152). It is also supported by the Wyss Institute for Biologically Inspired Engineering at Harvard University. We are grateful for the support from the National Geographic Society Innovation Challenge (Grant No.: SP 12-14) to RJW and DFG.
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    Multi-year patterns in testosterone, cortisol and corticosterone in baleen from adult males of three whale species (2018)
    Oxford University Press
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Conservation Physiology 6 (2018): coy049, doi:10.1093/conphys/coy049.
    Description: Male baleen whales have long been suspected to have annual cycles in testosterone, but due to difficulty in collecting endocrine samples, little direct evidence exists to confirm this hypothesis. Potential influences of stress or adrenal stress hormones (cortisol, corticosterone) on male reproduction have also been difficult to study. Baleen has recently been shown to accumulate steroid hormones during growth, such that a single baleen plate contains a continuous, multi-year retrospective record of the whale’s endocrine history. As a preliminary investigation into potential testosterone cyclicity in male whales and influences of stress, we determined patterns in immunoreactive testosterone, two glucocorticoids (cortisol and corticosterone), and stable-isotope (SI) ratios, across the full length of baleen plates from a bowhead whale (Balaena mysticetus), a North Atlantic right whale (Eubalaena glacialis) and a blue whale (Balaenoptera musculus), all adult males. Baleen was subsampled at 2 cm (bowhead, right) or 1 cm (blue) intervals and hormones were extracted from baleen powder with methanol, followed by quantification of all three hormones using enzyme immunoassays validated for baleen extract of these species. Baleen of all three males contained regularly spaced peaks in testosterone content, with number and spacing of testosterone peaks corresponding well to SI data and to species-specific estimates of annual baleen growth rate. Cortisol and corticosterone exhibited some peaks that co-occurred with testosterone peaks, while other glucocorticoid peaks occurred independent of testosterone peaks. The right whale had unusually high glucocorticoids during a period with a known entanglement in fishing gear and a possible disease episode; in the subsequent year, testosterone was unusually low. Further study of baleen testosterone patterns in male whales could help clarify conservation- and management-related questions such as age of sexual maturity, location and season of breeding, and the potential effect of anthropogenic and natural stressors on male testosterone cycles.
    Description: This work was supported by (1) the Arizona Board of Regents Technology Research Initiative Fund; (2) the Center for Bioengineering Innovation at Northern Arizona University; (3) the Greenland Institute of Natural Resources; (4) the Woods Hole Oceanographic Institution Ocean Life Institute and (5) Fisheries and Ocean Canada’s (DFO) Priorities and Partnership Strategic Initiatives Fund and Oceans Protection Plan.
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    Resonance control of acoustic focusing systems through an environmental reference table and impedance spectroscopy (2018)
    Public Library of Science
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in PLoS One 13 (2018): e0207532, doi:10.1371/journal.pone.0207532.
    Description: Acoustic standing waves can precisely focus flowing particles or cells into tightly positioned streams for interrogation or downstream separations. The efficiency of an acoustic standing wave device is dependent upon operating at a resonance frequency. Small changes in a system’s temperature and sample salinity can shift the device’s resonance condition, leading to poor focusing. Practical implementation of an acoustic standing wave system requires an automated resonance control system to adjust the standing wave frequency in response to environmental changes. Here we have developed a rigorous approach for quantifying the optimal acoustic focusing frequency at any given environmental condition. We have demonstrated our approach across a wide range of temperature and salinity conditions to provide a robust characterization of how the optimal acoustic focusing resonance frequency shifts across these conditions. To generalize these results, two microfluidic bulk acoustic standing wave systems (a steel capillary and an etched silicon wafer) were examined. Models of these temperature and salinity effects suggest that it is the speed of sound within the liquid sample that dominates the resonance frequency shift. Using these results, a simple reference table can be generated to predict the optimal resonance condition as a function of temperature and salinity. Additionally, we show that there is a local impedance minimum associated with the optimal system resonance. The integration of the environmental results for coarse frequency tuning followed by a local impedance characterization for fine frequency adjustments, yields a highly accurate method of resonance control. Such an approach works across a wide range of environmental conditions, is easy to automate, and could have a significant impact across a wide range of microfluidic acoustic standing wave systems.
    Description: This research was supported by grants from the National Institute of General Medical Sciences of the National Institutes of Health under award number R21GM107805 and the NSF under award number (OCE-1130140 and OCE-1131134) to SWG, RJO, and HMS.
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    Role of DNA methylation in altered gene expression patterns in adult zebrafish (Danio rerio) exposed to 3, 3’, 4, 4’, 5-pentachlorobiphenyl (PCB 126) (2018)
    Oxford University Press
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Environmental Epigenetics 4 (2018): dvy005, doi:10.1093/eep/dvy005.
    Description: There is growing evidence that environmental toxicants can affect various physiological processes by altering DNA methylation patterns. However, very little is known about the impact of toxicant-induced DNA methylation changes on gene expression patterns. The objective of this study was to determine the genome-wide changes in DNA methylation concomitant with altered gene expression patterns in response to 3, 3’, 4, 4’, 5-pentachlorobiphenyl (PCB126) exposure. We used PCB126 as a model environmental chemical because the mechanism of action is well-characterized, involving activation of aryl hydrocarbon receptor, a ligand-activated transcription factor. Adult zebrafish were exposed to 10 nM PCB126 for 24 h (water-borne exposure) and brain and liver tissues were sampled at 7 days post-exposure in order to capture both primary and secondary changes in DNA methylation and gene expression. We used enhanced Reduced Representation Bisulfite Sequencing and RNAseq to quantify DNA methylation and gene expression, respectively. Enhanced reduced representation bisulfite sequencing analysis revealed 573 and 481 differentially methylated regions in the liver and brain, respectively. Most of the differentially methylated regions are located more than 10 kilobases upstream of transcriptional start sites of the nearest neighboring genes. Gene Ontology analysis of these genes showed that they belong to diverse physiological pathways including development, metabolic processes and regeneration. RNAseq results revealed differential expression of genes related to xenobiotic metabolism, oxidative stress and energy metabolism in response to polychlorinated biphenyl exposure. There was very little correlation between differentially methylated regions and differentially expressed genes suggesting that the relationship between methylation and gene expression is dynamic and complex, involving multiple layers of regulation.
    Description: This work was supported by the National Institute of Health Outstanding New Environmental Scientist Award to NA (NIH R01ES024915) and Woods Hole Center for Oceans and Human Health [National Institutes of Health (NIH) grant P01ES021923 and National Science Foundation Grant OCE-1314642 to M. Hahn, J. Stegeman, NA and SK].
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    Geophysical evidence for the evolution of the California Inner Continental Borderland as a metamorphic core complex (2018)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2000. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 105 (2000): 5835-5857, doi:10.1029/1999JB900318.
    Description: We use new seismic and gravity data collected during the 1994 Los Angeles Region Seismic Experiment (LARSE) to discuss the origin of the California Inner Continental Borderland (ICB) as an extended terrain possibly in a metamorphic core complex mode. The data provide detailed crustal structure of the Borderland and its transition to mainland southern California. Using tomographic inversion as well as traditional forward ray tracing to model the wide-angle seismic data, we find little or no sediments, low (#6.6 km/s) P wave velocity extending down to the crust-mantle boundary, and a thin crust (19 to 23 km thick). Coincident multichannel seismic reflection data show a reflective lower crust under Catalina Ridge. Contrary to other parts of coastal California, we do not find evidence for an underplated fossil oceanic layer at the base of the crust. Coincident gravity data suggest an abrupt increase in crustal thickness under the shelf edge, which represents the transition to the western Transverse Ranges. On the shelf the Palos Verdes Fault merges downward into a landward dipping surface which separates “basement” from low-velocity sediments, but interpretation of this surface as a detachment fault is inconclusive. The seismic velocity structure is interpreted to represent Catalina Schist rocks extending from top to bottom of the crust. This interpretation is compatible with a model for the origin of the ICB as an autochthonous formerly hot highly extended region that was filled with the exhumed metamorphic rocks. The basin and ridge topography and the protracted volcanism probably represent continued extension as a wide rift until ;13 m.y. ago. Subduction of the young and hot Monterey and Arguello microplates under the Continental Borderland, followed by rotation and translation of the western Transverse Ranges, may have provided the necessary thermomechanical conditions for this extension and crustal inflow.
    Description: The LARSE experiment was funded by NSF EAR-9416774, the U.S. Geological Survey’s Earthquake Hazards and Coastal and Marine Programs, and by the Southern California Earthquake Center (SCEC).
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    Investigating microearthquake finite source attributes with IRIS Community Wavefield Demonstration Experiment in Oklahoma (2018)
    Oxford University Press
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © The Authors, 2018. This article is posted here by permission of The Royal Astronomical Society for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 215 (2018): 1072–1087, doi:10.1093/gji/ggy203.
    Description: An earthquake rupture process can be kinematically described by rupture velocity, duration and spatial extent. These key kinematic source parameters provide important constraints on earthquake physics and rupture dynamics. In particular, core questions in earthquake science can be addressed once these properties of small earthquakes are well resolved. However, these parameters of small earthquakes are poorly understood, often limited by available data sets and methodologies. The Incorporated Research Institutions for Seismology Community Wavefield Experiment in Oklahoma deployed ∼350 three-component nodal stations within 40 km2 for a month, offering an unprecedented opportunity to test new methodologies for resolving small earthquake finite source properties in high resolution. In this study, we demonstrate the power of the nodal data set to resolve the variations in the seismic wavefield over the focal sphere due to the finite source attributes of an M2 earthquake within the array. The dense coverage allows us to tightly constrain rupture area using the second moment method even for such a small earthquake. The M2 earthquake was a strike-slip event and unilaterally propagated towards the surface at 90 per cent local S-wave speed (2.93 km s−1). The earthquake lasted ∼0.019 s and ruptured Lc ∼70 m and Wc ∼45 m. With the resolved rupture area, the stress-drop of the earthquake is estimated as 7.3 MPa for Mw 2.3. We demonstrate that the maximum and minimum bounds on rupture area are within a factor of two, much lower than typical stress-drop uncertainty, despite a suboptimal station distribution. The rupture properties suggest that there is little difference between the M2 Oklahoma earthquake and typical large earthquakes. The new three-component nodal systems have great potential for improving the resolution of studies of earthquake source properties.
    Description: WF is currently supported by the Postdoctoral Scholar Program at the Woods Hole Oceanographic Institution, with funding provided by the Weston Howland Jr. Postdoctoral Scholarship. JM was partially supported by SCEC grant #17177 at Woods Hole Oceanographic Institution. This research was supported by the Southern California Earthquake Center (Contribution No. 8014). SCEC is funded by NSF Cooperative Agreement EAR-1033462 and USGS Cooperative Agreement G12AC20038.
    Keywords: Inverse theory ; Waveform inversion ; Body waves ; Earthquake dynamics ; Earthquake source observations ; Seismic instruments
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    Using surface waves recorded by a large mesh of three-element arrays to detect and locate disparate seismic sources (2018)
    Oxford University Press
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © The Authors, 2018. This article is posted here by permission of The Royal Astronomical Society for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 215 (2018): 942–958, doi:10.1093/gji/ggy316.
    Description: Surface waves recorded by global arrays have proven useful for locating tectonic earthquakes and in detecting slip events depleted in high frequency, such as glacial quakes. We develop a novel method using an aggregation of small- to continental-scale arrays to detect and locate seismic sources with Rayleigh waves at 20–50 s period. The proposed method is a hybrid approach including first dividing a large aperture aggregate array into Delaunay triangular subarrays for beamforming, and then using the resolved surface wave propagation directions and arrival times from the subarrays as data to formulate an inverse problem to locate the seismic sources and their origin times. The approach harnesses surface wave coherence and maximizes resolution of detections by combining measurements from stations spanning the whole U.S. continent. We tested the method with earthquakes, glacial quakes and landslides. The results show that the method can effectively resolve earthquakes as small as ∼M3 and exotic slip events in Greenland. We find that the resolution of the locations is non-uniform with respect to azimuth, and decays with increasing distance between the source and the array when no calibration events are available. The approach has a few advantages: the method is insensitive to seismic event type, it does not require a velocity model to locate seismic sources, and it is computationally efficient. The method can be adapted to real-time applications and can help in identifying new classes of seismic sources.
    Description: WF is currently supported by the Postdoctoral Scholar Program at the Woods Hole Oceanographic Institution, with funding provided by the Weston Howland Jr. Postdoctoral Scholarship. This work was supported by National Science Foundation grant EAR-1358520 at Scripps Institution of Oceanography, UC San Diego.
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    Slab tears and intermediate‐depth seismicity (2018)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 40 (2013): 4244-4248, doi:10.1002/grl.50830.
    Description: Active tectonic regions where plate boundaries transition from subduction to strike slip can take several forms, such as triple junctions, acute, and obtuse corners. Well‐documented slab tears that are associated with high rates of intermediate‐depth seismicity are considered here: Gibraltar arc, the southern and northern ends of the Lesser Antilles arc, and the northern end of Tonga trench. Seismicity at each of these locations occurs, at times, in the form of swarms or clusters, and various authors have proposed that each marks an active locus of tear propagation. The swarms and clusters start at the top of the slab below the asthenospheric wedge and extend 30–60 km vertically downward within the slab. We propose that these swarms and clusters are generated by fluid‐related embrittlement of mantle rocks. Focal mechanisms of these swarms generally fit the shear motion that is thought to be associated with the tearing process.
    Keywords: Slab tear ; Intermediate seismicity ; Subduction corner
    Repository Name: Woods Hole Open Access Server
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    Directly estimating earthquake rupture area using second moments to reduce the uncertainty in stress drop (2018)
    Oxford University Press
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2018. This article is posted here by permission of Oxford University Press for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 214 (2018): 2224–2235, doi:10.1093/gji/ggy201.
    Description: The key kinematic earthquake source parameters: rupture velocity, duration and area, shed light on earthquake dynamics, provide direct constraints on stress drop, and have implications for seismic hazard. However, for moderate and small earthquakes, these parameters are usually poorly constrained due to limitations of the standard analysis methods. Numerical experiments by Kaneko and Shearer demonstrated that standard spectral fitting techniques can lead to roughly one order of magnitude variation in stress-drop estimates that do not reflect the actual rupture properties even for simple crack models. We utilize these models to explore an alternative approach where we estimate the rupture area directly. For the suite of models, the area averaged static stress drop is nearly constant for models with the same underlying friction law, yet corner-frequency-based stress-drop estimates vary by a factor of 5–10 even for noise-free data. Alternatively, we simulated inversions for the rupture area as parametrized by the second moments of the slip distribution. A natural estimate for the rupture area derived from the second moments is A = πLcWc, where Lc and Wc are the characteristic rupture length and width. This definition yields estimates of stress drop that vary by only 10 per cent between the models but are slightly larger than the true area averaged values. We simulate inversions for the second moments for the various models and find that the area can be estimated well when there are at least 15 available measurements of apparent duration at a variety of take-off angles. The improvement compared to azimuthally averaged corner-frequency-based approaches results from the second moments accounting for directivity and removing the assumption of a circular rupture area, both of which bias the standard approach. We also develop a new method that determines the minimum and maximum values of rupture area that are consistent with a particular data set at the 95 per cent confidence level. For the Kaneko and Shearer models with 20+ randomly distributed observations and ∼10 per cent noise levels, we find that the maximum and minimum bounds on rupture area typically vary by a factor of two and that the minimum stress drop is often more tightly constrained than the maximum.
    Description: This work was supported by USGS NEHRP Award G17AP00029. The research was supported by the Southern California Earthquake Center (SCEC; Contribution No. 8013). SCEC is funded by NSF Cooperative Agreement EAR-1033462 and USGS Cooperative Agreement G12AC20038. YK was supported by both public funding from the Government of New Zealand and the Royal Society of New Zealand’s Rutherford Discovery Fellowship.
    Keywords: Earthquake dynamics ; Earthquake source observations ; Body waves
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    Strength in numbers : collaborative science for new experimental model systems (2018)
    Public Library of Science
    Details
    Publication Date: 2022-05-25
    Description: The work is made available under the Creative Commons CCO public domain dedication.. The definitive version was published in PLoS Biology 16 (2018): e2006333, doi:10.1371/journal.pbio.2006333.
    Description: Our current understanding of biology is heavily based on a small number of genetically tractable model organisms. Most eukaryotic phyla lack such experimental models, and this limits our ability to explore the molecular mechanisms that ultimately define their biology, ecology, and diversity. In particular, marine protists suffer from a paucity of model organisms despite playing critical roles in global nutrient cycles, food webs, and climate. To address this deficit, an initiative was launched in 2015 to foster the development of ecologically and taxonomically diverse marine protist genetic models. The development of new models faces many barriers, some technical and others institutional, and this often discourages the risky, long-term effort that may be required. To lower these barriers and tackle the complexity of this effort, a highly collaborative community-based approach was taken. Herein, we describe this approach, the advances achieved, and the lessons learned by participants in this novel community-based model for research.
    Description: The research efforts, connections, and collaborations described in this paper and protocols.io (https://www.protocols.io/) were supported by the Gordon and Betty Moore Foundation’s Marine Microbiology Initiative.
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    Magma wagging and whirling : excitation by gas flux (2018)
    Oxford University Press
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © The Authors, 2018. This article is posted here by permission of The Royal Astronomical Society for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 215 (2018): 713–735, doi:10.1093/gji/ggy313.
    Description: Gas flux in volcanic conduits is often associated with long-period oscillations known as seismic tremor (Lesage et al.; Nadeau et al.). In this study, we revisit and extend the ‘magma wagging’and ‘whirling’models for seismic tremor, in order to explore the effects of gas flux on the motion of a magma column surrounded by a permeable vesicular annulus (Jellinek & Bercovici; Bercovici et al.; Liao et al.). We find that gas flux flowing through the annulus leads to a Bernoulli effect, which causes waves on the magma column to become unstable and grow. Specifically, the Bernoulli effects are associated with torques and forces acting on the magma column, increasing its angular momentum and energy. As the displacement of the magma column becomes large due to the Bernoulli effect, frictional drag on the conduit wall decelerates the motions of the column, restoring them to small amplitude. Together, the Bernoulli effect and the damping effect contribute to a self-sustained wagging-and-whirling mechanism that help explain the longevity of long-period seismic tremor.
    Description: This work was supported by National Science Foundation grants EAR-1344538 and EAR-1645057
    Keywords: Physics of magma and magma bodies ; Volcano seismology ; Volcanic gases
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    Seismic evidence for a slab tear at the Puerto Rico Trench (2018)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 105 (2013): 2915-2923, doi:10.1002/jgrb.50227.
    Description: The fore‐arc region of the northeast Caribbean plate north of Puerto Rico and the Virgin Islands has been the site of numerous seismic swarms since at least 1976. A 6 month deployment of five ocean bottom seismographs recorded two such tightly clustered swarms, along with additional events. Joint analyses of the ocean bottom seismographs and land‐based seismic data reveal that the swarms are located at depths of 50–150 km. Focal mechanism solutions, found by jointly fitting P wave first‐motion polarities and S/P amplitude ratios, indicate that the broadly distributed events outside the swarm generally have strike‐ and dip‐slip mechanisms at depths of 50–100 km, while events at depths of 100–150 km have oblique mechanisms. A stress inversion reveals two distinct stress regimes: The slab segment east of 65°W longitude is dominated by trench‐normal tensile stresses at shallower depths (50–100 km) and by trench‐parallel tensile stresses at deeper depths (100–150 km), whereas the slab segment west of 65°W longitude has tensile stresses that are consistently trench normal throughout the depth range at which events were observed (50–100 km). The simple stress pattern in the western segment implies relatively straightforward subduction of an unimpeded slab, while the stress pattern observed in the eastern segment, shallow trench‐normal tension and deeper trench‐normal compression, is consistent with flexure of the slab due to rollback. These results support the hypothesis that the subducting North American plate is tearing at or near these swarms. The 35 year record of seismic swarms at this location and the recent increase in seismicity suggest that the tear is still propagating.
    Keywords: Subduction ; Slab‐tear ; Caribbean ; Focal mechanism ; Stress inversion
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    New seafloor map of the Puerto Rico trench helps assess earthquake and tsunami hazards (2018)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Eos 85 (2004): 349,354, doi:10.1029/2004EO370001 .
    Description: The Puerto Rico Trench, the deepest part of the Atlantic Ocean, is located where the North American (NOAM) plate is subducting under the Caribbean plate (Figure l). The trench region may pose significant seismic and tsunami hazards to Puerto Rico and the U.S.Virgin Islands, where 4 million U.S. citizens reside. Widespread damage in Puerto Rico and Hispaniola from an earthquake in 1787 was estimated to be the result of a magnitude 8 earthquake north of the islands [McCann et al., 2004]. A tsunami killed 40 people in NW Puerto Rico following a magnitude 7.3 earthquake in 1918 [Mercado and McCann, 1998]. Large landslide escarpments have been mapped on the seafloor north of Puerto Rico [Mercado et al., 2002; Schwab et al., 1991],although their ages are unknown.
    Description: Funding was provided by the NOAA Office of Ocean Exploration and the USGS Coastal and Marine Program
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    Predictive modelling of grain-size distributions from marine electromagnetic profiling data using end-member analysis and a radial basis function network (2018)
    Oxford University Press
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © The Authors, 2018. This article is posted here by permission of The Royal Astronomical Society for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 215 (2018): 460–473, doi:10.1093/gji/ggy152.
    Description: In this work, we present a new methodology to predict grain-size distributions from geophysical data. Specifically, electric conductivity and magnetic susceptibility of seafloor sediments recovered from electromagnetic profiling data are used to predict grain-size distributions along shelf-wide survey lines. Field data from the NW Iberian shelf are investigated and reveal a strong relation between the electromagnetic properties and grain-size distribution. The here presented workflow combines unsupervised and supervised machine-learning techniques. Non-negative matrix factorization is used to determine grain-size end-members from sediment surface samples. Four end-members were found, which well represent the variety of sediments in the study area. A radial basis function network modified for prediction of compositional data is then used to estimate the abundances of these end-members from the electromagnetic properties. The end-members together with their predicted abundances are finally back transformed to grain-size distributions. A minimum spatial variation constraint is implemented in the training of the network to avoid overfitting and to respect the spatial distribution of sediment patterns. The predicted models are tested via leave-one-out cross-validation revealing high prediction accuracy with coefficients of determination (R2) between 0.76 and 0.89. The predicted grain-size distributions represent the well-known sediment facies and patterns on the NW Iberian shelf and provide new insights into their distribution, transition and dynamics. This study suggests that electromagnetic benthic profiling in combination with machine learning techniques is a powerful tool to estimate grain-size distribution of marine sediments.
    Description: This work was funded through DFG Research Center/Cluster of Excellence ‘The Ocean in the Earth System’ and was part of MARUM Research Area SD
    Keywords: Neural networks ; Fuzzy logic ; Statistical methods ; Electrical properties ; Magnetic properties ; Marine electromagnetics ; Controlled source electromagnetics (CSEM)
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    Indoles induce metamorphosis in a broad diversity of jellyfish, but not in a crown jelly (Coronatae) (2018)
    Public Library of Science
    Details
    Publication Date: 2022-05-26
    Description: © The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in PLoS One 12 (2017): e0188601, doi:10.1371/journal.pone.0188601.
    Description: Many animals go through one or more metamorphoses during their lives, however, the molecular underpinnings of metamorphosis across diverse species are not well understood. Medusozoa (Cnidaria) is a clade of animals with complex life cycles, these life cycles can include a polyp stage that metamorphoses into a medusa (jellyfish). Medusae are produced through a variety of different developmental mechanisms—in some species polyps bud medusae (Hydrozoa), in others medusae are formed through polyp fission (Scyphozoa), while in others medusae are formed through direct transformation of the polyp (Cubozoa). To better understand the molecular mechanisms that may coordinate these different forms of metamorphosis, we tested two compounds first identified to induce metamorphosis in the moon jellyfish Aurelia aurita (indomethacin and 5-methoxy-2-methylindole) on a broad diversity of medusozoan polyps. We discovered that indole-containing compounds trigger metamorphosis across a broad diversity of species. All tested discomedusan polyps metamorphosed in the presence of both compounds, including species representatives of several major lineages within the clade (Pelagiidae, Cyaneidae, both clades of Rhizostomeae). In a cubozoan, low levels of 5-methoxy-2-methylindole reliably induced complete and healthy metamorphosis. In contrast, neither compound induced medusa metamorphosis in a coronate scyphozoan, or medusa production in either hydrozoan tested. Our results support the hypothesis that metamorphosis is mediated by a conserved induction pathway within discomedusan scyphozoans, and possibly cubozoans. However, failure of these compounds to induce metamorphosis in a coronate suggests this induction mechanism may have been lost in this clade, or is convergent between Scyphozoa and Cubozoa.
    Description: National Science Foundation Graduate Research Fellowship (DGE - 1058262; https://www.nsfgrfp.org/general_resources/about) to RRH. Evo-Devo-Eco Network (IOS # 0955517; http://edenrcn.com/) Research Exchange Funds, awarded to RRH. National Science Foundation Rhode Island Established Program to Stimulate Competitive Graduate Research Fellowship to RRH (DEB-1256695; http://web.uri.edu/rinsfepscor/grad-fellowships/). Brown University Ecology and Evolutionary Biology Dissertation Development Grant from the Bushnell Research and Education Fund awarded to RRH.
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    Intra- and intertrench variations in flexural bending of the Manila, Mariana and global trenches : implications on plate weakening in controlling trench dynamics (2018)
    Oxford University Press
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © Author(s), 2017. This article is posted here by permission of Oxford University Press for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 212 (2018): 1429–1449, doi:10.1093/gji/ggx488.
    Description: We conducted detailed analyses of a global array of trenches, revealing systematic intra- and intertrench variations in plate bending characteristics. The intratrench variations of the Manila and Mariana Trenches were analysed in detail as end-member cases of the relatively young (16–36 Ma) and old (140–160 Ma) subducting plates, respectively. Meanwhile, the intertrench variability was investigated for a global array of additional trenches including the Philippine, Kuril, Japan, Izu-Bonin, Aleutian, Tonga-Kermadec, Middle America, Peru, Chile, Sumatra and Java Trenches. Results of the analysis show that the trench relief (W0) and width (X0) of all systems are controlled primarily by the faulting-reduced elastic thickness near the trench axis (Tme) and affected only slightly by the initial unfaulted thickness (TMe) of the incoming plate. The reduction in Te has caused significant deepening and narrowing of trench valleys. For the cases of relatively young or old plates, the plate age could be a dominant factor in controlling the trench bending shape, regardless the variations in axial loadings. Our calculations also show that the axial loading and stresses of old subducting plates can vary significantly along the trench axis. In contrast, the young subducting plates show much smaller values and variations in axial loading and stresses.
    Description: This work was supported by Chinese Academy of Sciences Grants (Y4SL021001, QYZDY-SSW-DQC005, YZ201325 and YZ201534), National Natural Science Foundation of China Grants (91628301, U1606401, 41376063 and 41706056) and HKSAR Research Grant Council Grants (24601515, 14313816).
    Keywords: Lithospheric flexure ; Subduction zone processes
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    Linking deep convection and phytoplankton blooms in the northern Labrador Sea in a changing climate (2018)
    Public Library of Science
    Details
    Publication Date: 2022-05-26
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in PLoS One 13 (2018): e0191509, doi:10.1371/journal.pone.0191509.
    Description: Wintertime convective mixing plays a pivotal role in the sub-polar North Atlantic spring phytoplankton blooms by favoring phytoplankton survival in the competition between light-dependent production and losses due to grazing and gravitational settling. We use satellite and ocean reanalyses to show that the area-averaged maximum winter mixed layer depth is positively correlated with April chlorophyll concentration in the northern Labrador Sea. A simple theoretical framework is developed to understand the relative roles of winter/spring convection and gravitational sedimentation in spring blooms in this region. Combining climate model simulations that project a weakening of wintertime Labrador Sea convection from Arctic sea ice melt with our framework suggests a potentially significant reduction in the initial fall phytoplankton population that survive the winter to seed the region’s spring bloom by the end of the 21st century.
    Description: KB, LB, PJR and LRL were supported by the Office of Science (BER), U. S. Department of Energy as part of the Regional and Global Climate Modelling (RGCM) Program. SCD acknowledges support from NASA Award NNX15AE65G North Atlantic Aerosol and Marine Ecosystem Study (NAAMES).
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    Prion protein inhibits fast axonal transport through a mechanism involving casein kinase 2 (2018)
    Public Library of Science
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    Publication Date: 2022-05-26
    Description: © The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in PLoS One 12 (2017): e0188340, doi:10.1371/journal.pone.0188340.
    Description: Prion diseases include a number of progressive neuropathies involving conformational changes in cellular prion protein (PrPc) that may be fatal sporadic, familial or infectious. Pathological evidence indicated that neurons affected in prion diseases follow a dying-back pattern of degeneration. However, specific cellular processes affected by PrPc that explain such a pattern have not yet been identified. Results from cell biological and pharmacological experiments in isolated squid axoplasm and primary cultured neurons reveal inhibition of fast axonal transport (FAT) as a novel toxic effect elicited by PrPc. Pharmacological, biochemical and cell biological experiments further indicate this toxic effect involves casein kinase 2 (CK2) activation, providing a molecular basis for the toxic effect of PrPc on FAT. CK2 was found to phosphorylate and inhibit light chain subunits of the major motor protein conventional kinesin. Collectively, these findings suggest CK2 as a novel therapeutic target to prevent the gradual loss of neuronal connectivity that characterizes prion diseases.
    Description: This work was supported by Alzheimer Association New Investigator Research Grant to Promote Diversity NIRGD-11-206379 and Consejo Nacional de Investigaciones Científicas y Técnicas PIP 112 20150100954 CO (to GP), National Institutes of Health NS066942A and NS096642 (to GM), R01-NS023868 and R01-NS041170 (to STB).
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    Cells containing aragonite crystals mediate responses to gravity in Trichoplax adhaerens (Placozoa), an animal lacking neurons and synapses (2018)
    Public Library of Science
    Details
    Publication Date: 2022-05-26
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in PLoS One 13 (2018): e0190905, doi:10.1371/journal.pone.0190905.
    Description: Trichoplax adhaerens has only six cell types. The function as well as the structure of crystal cells, the least numerous cell type, presented an enigma. Crystal cells are arrayed around the perimeter of the animal and each contains a birefringent crystal. Crystal cells resemble lithocytes in other animals so we looked for evidence they are gravity sensors. Confocal microscopy showed that their cup-shaped nuclei are oriented toward the edge of the animal, and that the crystal shifts downward under the influence of gravity. Some animals spontaneously lack crystal cells and these animals behaved differently upon being tilted vertically than animals with a typical number of crystal cells. EM revealed crystal cell contacts with fiber cells and epithelial cells but these contacts lacked features of synapses. EM spectroscopic analyses showed that crystals consist of the aragonite form of calcium carbonate. We thus provide behavioral evidence that Trichoplax are able to sense gravity, and that crystal cells are likely to be their gravity receptors. Moreover, because placozoans are thought to have evolved during Ediacaran or Cryogenian eras associated with aragonite seas, and their crystals are made of aragonite, they may have acquired gravity sensors during this early era.
    Description: This research was supported by the intramural research program of the NIH, NINDS.
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    Skillful long-lead prediction of summertime heavy rainfall in the US Midwest from sea surface salinity (2022)
    American Geophysical Union
    Details
    Publication Date: 2023-01-07
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 49(13), (2022): e2022GL098554, https://doi.org/10.1029/2022GL098554.
    Description: Summertime heavy rainfall and its resultant floods are among the most harmful natural hazards in the US Midwest, one of the world's primary crop production areas. However, seasonal forecasts of heavy rain, currently based on preseason sea surface temperature anomalies (SSTAs), remain unsatisfactory. Here, we present evidence that sea surface salinity anomalies (SSSAs) over the tropical western Pacific and subtropical North Atlantic are skillful predictors of summer time heavy rainfall one season ahead. A one standard deviation change in tropical western Pacific SSSA is associated with a 1.8 mm day−1 increase in local precipitation, which excites a teleconnection pattern to extratropical North Pacific. Via extratropical air-sea interaction and long memory of midlatitude SSTA, a wave train favorable for US Midwest heavy rain is induced. Combined with soil moisture feedbacks bridging the springtime North Atlantic salinity, the SSSA-based statistical prediction model improves Midwest heavy rainfall forecasts by 92%, complementing existing SSTA-based frameworks.
    Description: This study is supported by the NSF PREEVENTS program under ICER-1663138 (LL) and ICER-1663704 (RWS and CCU).
    Description: 2023-01-07
    Keywords: Sea surface salinity ; Midwest precipitation ; Heavy rainfall ; Long-lead prediction
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    Contributions of different sea-level processes to high-tide flooding along the US coastline (2022)
    American Geophysical Union
    Details
    Publication Date: 2023-01-14
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 127(7), (2022): e2021JC018276, https://doi.org/10.1029/2021JC018276.
    Description: Coastal communities across the United States (U.S.) are experiencing an increase in the frequency of high-tide flooding (HTF). This increase is mainly due to sea-level rise (SLR), but other factors such as intra- to inter-annual mean sea level variability, tidal anomalies, and non-tidal residuals also contribute to HTF events. Here we introduce a novel decomposition approach to develop and then analyze a new database of different sea-level components. Those components represent processes that act on various timescales to contribute to HTF along the U.S. coastline. We find that the relative importance of components to HTF events strongly varies in space and time. Tidal anomalies contribute the most along the west and northeast coasts, where HTF events mostly occur in winter. Non-tidal residuals are most important along the Gulf of Mexico and mid-Atlantic coasts, where HTF events mostly occur in fall. We also quantify the minimum number of components that were required to cause HTF events in the past and how this number changed over time. The results highlight that at present, due to SLR, fewer components are needed to combine to push water levels above HTF thresholds, but tidal anomalies alone are still not sufficient to reach HTF thresholds in most locations. Finally, we explore how co-variability between different components leads to compounding effects. In some places, positive correlation between sea-level components leads to significantly more HTF events than would be expected if sea-level components were uncorrelated, whereas in other places negative correlation leads to fewer HTF events.
    Description: his work was supported by NASA's Sea Level Change Team award number 80NSSC20K1241. S.L. also acknowledges support by the China Scholarship Council (no. 201904910413) and the Ministry of Science and Technology of the People's Republic of China (grant no. 2011YQ120045).
    Description: 2023-01-14
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    Master stability functions for metacommunities with two types of habitats (2022)
    American Physical Society (APS)
    In:  EPIC3Physical Review E, American Physical Society (APS), 105(4), pp. 044310-044310, ISSN: 2470-0045
    Details
    Publication Date: 2023-12-05
    Description: Current questions in ecology revolve around instabilities in the dynamics on spatial networks and particularly the effect of node heterogeneity. We extend the master stability function formalism to inhomogeneous biregular networks having two types of spatial nodes. Notably, this class of systems also allows the investigation of certain types of dynamics on higher-order networks. Combined with the generalized modeling approach to study the linear stability of steady states, this is a powerful tool to numerically asses the stability of large ensembles of systems. We analyze the stability of ecological metacommunities with two distinct types of habitats analytically and numerically in order to identify several sets of conditions under which the dynamics can become stabilized by dispersal. Our analytical approach allows general insights into stabilizing and destabilizing effects in metapopulations. Specifically, we identify self-regulation and negative feedback loops between source and sink populations as stabilizing mechanisms and we show that maladaptive dispersal may be stable under certain conditions.
    Repository Name: EPIC Alfred Wegener Institut
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    Submarine groundwater discharge in the northern Bohai Sea, China: Implications for coastal carbon budgets and buffering capacity (2022)
    American Geophysical Union
    Details
    Publication Date: 2023-01-20
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Biogeosciences 127(8), (2022): e2022JG006810, https://doi.org/10.1029/2022jg006810.
    Description: Submarine groundwater discharge (SGD) has been widely recognized as an important source of dissolved nutrients in coastal waters and affects nutrient biogeochemistry. In contrast, little information is available on SGD impacts on coastal carbon budgets. Here, we assessed the SGD and associated carbon (dissolved inorganic carbon [DIC] and total alkalinity [TA]) fluxes in Liaodong Bay (the largest bay of the Bohai Sea, China) and discussed their border implications for coastal DIC budget and buffering capacity. Based on 223Ra and 228Ra mass balance models, the SGD flux was estimated to be (0.92–1.43) × 109 m3 d−1. SGD was the largest contributor of DIC, accounting for 55%–77% of the total DIC sources. The low ratio (〈1) of SGD-derived TA to DIC fluxes and negative correlation between radium isotopes and pH in seawater implied that SGD would potentially reduce seawater pH in Liaodong Bay. Combining the groundwater carbon data in Liaodong Bay with literature data, we found that the SGD-derived DIC flux off China was 4–9 times greater than those from rivers. By analyzing the TA/DIC ratios in groundwater along the Chinese coast and related carbon fluxes, SGD was thought to partially reduce the CO2 buffer capacity in receiving seawater. These results obtained at the bay scale and national scale suggest that SGD is a significant component of carbon budget and may play a critical role in modulating coastal buffering capacity and atmospheric CO2 sequestration.
    Description: his research was supported by National Natural Science Foundation of China (Grant Nos. 42130703, 42007170) and the Science, Technology and Innovation Commission of Shenzhen (Grant No. 20200925174525002.
    Description: 2023-01-20
    Keywords: Submarine groundwater discharge ; Radium isotopes ; Dissolved inorganic carbon ; Total alkalinity ; Carbon budgets ; Buffering capacity
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    Metagenomic survey of the microbiome of ancient Siberian permafrost and modern Kamchatkan cryosols (2022)
    Oxford University Press
    In:  EPIC3microLife, Oxford University Press, 3(1), pp. 1-15, ISSN: 2633-6693
    Details
    Publication Date: 2024-01-30
    Description: In the context of global warming, the melting of arctic permafrost raises the threat of a re-emergence of microorganisms some of which were shown to remain viable in ancient frozen soils for up to half a million years. In order to evaluate this risk, it is of interest to acquire a better knowledge of the composition of the microbial communities found in this understudied environment. Here we present a metagenomics analysis of 12 soil samples from Russian Arctic and subarctic pristine areas: Chukotka, Yakutia, and Kamchatka, including 9 permafrost samples collected at various depths. These large datasets (9.2 1011 total bp) were assembled (525,313 contigs 〉 5kb), their encoded protein contents predicted, then used to perform taxonomical assignments of bacterial, archaeal, and eukaryotic organisms, as well as DNA viruses. The various samples exhibited variable DNA contents and highly diverse taxonomic profiles showing no obvious relationship with their locations, depths or deposit ages. Bacteria represented the largely dominant DNA fraction (95%) in all samples, followed by archaea (3.2%), surprisingly little eukaryotes (0.5%), and viruses (0.4%). Although no common taxonomic pattern was identified, the samples shared unexpected high frequencies of β-lactamase genes, almost 0.9 copy/bacterial genome. In addition of known environmental threats, the particularly intense warming of the Arctic might thus enhance the spread of bacterial antibiotic resistances, today's major challenge in public health. β-lactamases were also observed at high frequency in other types of soils, suggesting their general role in the regulation of bacterial populations.
    Repository Name: EPIC Alfred Wegener Institut
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  • 86
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    A Theoretical Model for the Evolution of Microstructure in Lithospheric Shear Zones (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉The strength of the lithosphere plays a key role in the formation and evolution of tectonic plate boundaries. Localized lithospheric deformation associated with plate tectonics requires a mechanism for weakening across the entire width of the lithosphere, including the strongest cold ductile region. We explore the microphysics of weakening of lithospheric materials, and in particular the coupled evolution of mineral grain size and intragranular defects and their control on lithospheric strength. We propose a model for the interaction between grain-boundaries and dislocation density to reduce the net free energy of grains during dynamic recrystallization (DRX). The driving forces for DRX arise from heterogeneity in dislocation density and grain boundary curvature. Our model shows that grain growth driven by variation in grain boundary curvature can be impeded by variation in dislocation density; this occurs because as the grains grow, to minimize their surface energy, their dislocation density and associated internal energy may increase and offset the driving forces for grain growth. The correlation between grain size and dislocation density can for example arise because the dislocation accumulation in smaller grains is suppressed due to the large stress that is needed to bend and elongate a short dislocation (as dictated by the small grain size), while the larger grains can have long dislocations and reach a steady state dislocation density dictated by the applied stress. In a lithospheric setting, slower grain growth means that it would require less mechanical work to establish weak localized shear zones through grain damage, and retard the healing of previously damaged zones. Furthermore, the competition of two different time-scales - that of grain growth and the dislocation kinetics - can lead to oscillating behavior over 1 to 10 years as the grain size and dislocation density advance towards their steady states. These oscillations are likely to have an effect on the rheology of lithospheric rocks, e.g. their strengthening and weakening through time, and have a potential application to geological processes such as postseismic creep in ductile shear zones.〈/span〉
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    Locating and monitoring microseismicity, hydraulic fracture and earthquake rupture using elastic time-reversal imaging (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉Locating and monitoring passive seismic sources provides us important information for studying subsurface rock deformation, injected fluid migration, regional stress conditions as well as fault rupture mechanism. In this paper, we present a novel passive-source monitoring approach using vector-based elastic time-reversal imaging. By solving the elastic wave equation using observed multicomponent records as boundary conditions, we first compute back-propagated elastic wavefields in the subsurface. Then, we separate the extrapolated wavefields into compressional (P-wave) and shear (S-wave) modes using the vector Helmholtz decomposition. A zero-lag cross-correlation imaging condition is applied to the separated pure-mode vector wavefields to produce passive-source images. We compare imaging results using three implementations, i.e., dot-product, energy and power. Numerical experiments demonstrate that the power imaging condition gives us the highest resolution and is less sensitive to the presence of random noises. To capture the propagation of microseismic fracture and earthquake rupture, we modify the traditional zero-lag cross-correlation imaging condition by summing the multiplication of the separated P- and S-wavefields within local time windows, which enables us to capture the temporal and spatial evolution of earthquake rupture. 2D and 3D numerical examples demonstrate that the proposed method is capable of accurately locating point sources, as well as delineating dynamic propagation of hydraulic fracture and earthquake rupture.〈/span〉
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    Distribution and magnitude of stress due to lateral variation of gravitational potential energy between Indian lowland and Tibetan plateau (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉Magnitudes of differential stress in the lithosphere, especially in the crust, are still disputed. Earthquake-based stress drop estimates indicate median values 〈 10 MPa whereas the lateral variation of gravitational potential energy per unit area (〈span〉GPE〈/span〉) across significant relief indicates stress magnitudes of ca. 100 MPa in average across a 100 km thick lithosphere between the Indian lowland and the Tibetan plateau. These standard 〈span〉GPE〈/span〉-based stress estimates correspond to membrane stresses, because they are associated with a deformation that is uniform with depth. We show here with new analytical results that lateral variations in 〈span〉GPE〈/span〉 can also cause bending moments and related bending stresses of several hundreds of MPa. Furthermore, we perform two-dimensional thermo-mechanical numerical simulations (1) to evaluate estimates for membrane and bending stresses based on 〈span〉GPE〈/span〉 variations, (2) to quantify minimum crustal stress magnitudes that are required to maintain the topographic relief between Indian lowland and Tibetan plateau for ca. 10 Ma and (3) to quantify the corresponding relative contribution of crustal strength to the total lithospheric strength. The numerical model includes viscoelastoplastic deformation, gravity and heat transfer. The model configuration is based on density fields from the CRUST1.0 data set and from a geophysically and petrologically constrained density model based on 〈span〉in situ〈/span〉 field campaigns. The numerical results indicate that values of differential stress in the upper crust must be 〉 ca. 180 MPa, corresponding to a friction angle of ca. 10°, to maintain the topographic relief between lowland and plateau for 〉 10 Ma. The relative contribution of crustal strength to total lithospheric strength varies considerably laterally. In the region between lowland and plateau and inside the plateau the depth-integrated crustal strength is approximately equal to the depth-integrated strength of the mantle lithosphere. Simple analytical formulae predicting the lateral variation of depth-integrated stresses agree with numerically calculated stress fields, which show both the accuracy of the numerical results and the applicability of simple, rheology-independent, analytical predictions to highly variable, rheology-dependent, stress fields. Our results indicate that (1) crustal strength can be locally equal to mantle lithosphere strength and that (2) crustal stresses must be at least one order of magnitude larger than median stress drops in order to support the plateau relief over a duration of ca. 10 Ma.〈/span〉
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    A uniqueness theorem for tomography-assisted potential-field inversion (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉Scanning magnetometers are increasingly used to characterize the magnetization of mineral grains in rock samples. Up-scaling this measurement technique to large numbers of individual particles is hampered by the intrinsic non-uniqueness of potential-field inversion. Here it is shown that this problem can be circumvented by adding tomographic information that determines the location of the possible field sources. Standard potential theory is used to prove a uniqueness theorem which completely characterizes the mathematical background of the corresponding source-localized inversion. It exactly resolves under which conditions a potential field measurement on a surface can be uniquely decomposed into signals from the different source regions. The intrinsic non-uniqueness of potential field inversion prevents that the source distribution inside the tomographically outlined regions can be recovered, but the potential field of each region is uniquely defined. For scanning magnetometers in rock magnetism, this result implies that magnetic dipole vectors of large numbers of individual magnetic particles can be reliably reconstructed from surface scans of the magnetic field, if the particle positions are independently determined. This provides an incentive to improve scanning methods for future paleomagnetic applications.〈/span〉
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    Empirical evaluation of the magnitude-independence assumption (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉The most common earthquake forecasting models assume that the magnitude of the next earthquake is independent from the past. This feature severely limits the capability to forecast large earthquakes with high probabilities. Here we investigate empirically on the magnitude-independence assumption, exploring if: i) background and triggered earthquakes have the same frequency-magnitude distribution, ii) variations of seismicity in the space-time-magnitude domain encode some information on the future earthquakes size. For this purpose, and to verify the stability of the findings, we consider seismic catalogues covering different space-time-magnitude windows, such as the Alto Tiberina Near Fault Observatory (TABOO), the California and Japanese seismic catalogues. Our approach is inspired by the nearest-neighbour method proposed by Baiesi & Paczuski (2004) and elaborated by Zaliapin et al. (2008) to distinguish between triggered and background earthquakes. Here we implement the same metric-based correlation to identify the precursory seismicity of any triggered earthquake; this allows us to analyse, for each triggered earthquake, the space-time-magnitude distribution of the seismicity that likely contributed to its occurrence. Our results show that the magnitude-independence assumption holds reasonably well in all catalogues, with a remarkable exception that is consistent with a previous independent study; this departure from the magnitude-independence assumption shows that larger events tend to nucleate at a higher distance from the ongoing sequence. We also notice that the reliability of this assumption may depend on the spatial scale considered; it holds for seismic catalogues of large areas, but we identify possible departures in small areas, reflecting different ways to release locally seismic energy. Finally, we come across an important issue that may lead to misleading results in similar studies, i.e., if a seismic catalogue appears overall complete above a fixed magnitude threshold, it may still yield spurious signals into the analysis. Specifically, we show that some significant departures from the magnitude-independence assumption do not survive when considering spatiotemporal variations of the magnitude of completeness.〈/span〉
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    Vp/Vs tomography in the southern California plate boundary region using body- and surface-wave traveltime data (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉Vp/Vs models provide important complementary information to Vp and Vs models, relevant to lithology, rock damage, partial melting, water saturation, etc. However, seismic tomography using body-wave traveltime data from local or regional earthquakes does not constrain Vp/Vs well due to the different resolution of Vp and Vs models, with the Vp models usually better constrained than Vs. Since surface-wave data are most sensitive to Vs, which leads to complementary strengths with respect to body-wave data, we jointly invert body- and surface-wave data to better resolve the Vp/Vs models. In order to show the robustness of our joint inversion method, we compare the results to other approaches, including dividing Vp by Vs models and Vp/Vs parameterization with body-wave or both body- and surface-wave data, using synthetic data and real data from the southern California plate boundary region. We confirm that Vp/Vs models from body-wave inversion obtained by division tend to include artifacts, even when both Vp and Vs models seem reasonable. The joint inversion with Vp/Vs parameterization is found to improve the Vp/Vs ratio model significantly and the resultant Vp/Vs model shows more geologically consistent features, such as high Vp/Vs along fault traces at shallow depths likely indicating fault-related damage. The Vp/Vs model also exhibits contrasts at intermediate depths along the Peninsular Range compositional boundary, and high Vp/Vs in the lower crust near the Salton Sea region correlated with high heat flow and may indicate partial melting. The improved Vp/Vs as well as individual Vp and Vs models are useful for earthquake relocation, high-resolution Moho depth imaging, and interpretation of other data and tectonic evolution in the region.〈/span〉
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    Variability in surface rupture between successive earthquakes on the Suusamyr Fault, Kyrgyz Tien Shan: implications for palaeoseismology (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉Interpretation of surface fault scarps and palaeoseismic trenches is a key component of estimating fault slip rates, earthquake recurrence rates and maximum magnitudes for hazard assessments. Often these analyses rely on the assumption that successive earthquakes all breached the surface and that the ruptures are recorded topographically, or by the deposits exposed in a trench. The M〈sub〉〈span〉w〈/span〉〈/sub〉7.2 1992 Suusamyr earthquake, Kyrgyzstan, is an apparently problematic case for such analyses because its ruptures show significant displacement but are only mapped as having broken the surface along small, disparate portions of the fault. Here we present the results of surveys conducted along the Suusamyr Fault to establish whether that is the case. Two sets of ruptures were identified following the earthquake. They are unusually short for their displacement and are separated by a 25 km gap. Using satellite imagery, high-resolution digital elevation models and palaeoseismic trenching we first reassess the distribution of the 1992 ruptures and then reconstruct the Holocene earthquake record to establish the extent to which the 1992 earthquake is representative of the rupture behaviour of this fault. We find evidence for at least two prehistoric surface rupturing earthquakes in the Holocene: one ∼3 ka and one 〉8 ka that, along with the modern event, gives recurrence intervals of ∼3 kyr and ∼5 kyr. Within spatial gaps between segments of the 1992 ruptures there are clear prehistoric surface ruptures and the ruptures in each prehistoric earthquake were discontinuous. We conclude that there is significant variability in the surface rupture pattern of successive earthquakes on the Suusamyr Fault, with implications for the completeness of palaeoseismic records obtained from thrust scarps.〈/span〉
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    6-C polarization analysis using point measurements of translational and rotational ground-motion: theory and applications (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉We provide a six-component (6-C) polarization model for 〈span〉P〈/span〉-, 〈span〉SV〈/span〉-, 〈span〉SH〈/span〉-, Rayleigh-, and Love-waves both inside an elastic medium as well as at the free surface. It is shown that single-station 6-C data comprised of three components of rotational motion and three components of translational motion provide the opportunity to unambiguously identify the wave type, propagation direction, and local 〈span〉P〈/span〉- and 〈span〉S〈/span〉-wave velocities at the receiver location by use of polarization analysis. To extract such information by conventional processing of three-component (3-C) translational data would require large and dense receiver arrays. The additional rotational components allow the extension of the rank of the coherency matrix used for polarization analysis. This enables us to accurately determine the wave type and wave parameters (propagation direction and velocity) of seismic phases, even if more than one wave is present in the analysis time window. This is not possible with standard, pure-translational 3-C recordings. In order to identify modes of vibration and to extract the accompanying wave parameters, we adapt the multiple signal classification algorithm (MUSIC). Due to the strong nonlinearity of the MUSIC estimator function, it can be used to detect the presence of specific wave types within the analysis time window at very high resolution. We show how the extracted wavefield properties can be used, in a fully automated way, to separate the wavefield into its different wave modes using only a single 6-C recording station. As an example, we apply the method to remove surface wave energy while preserving the underlying reflection signal and to suppress energy originating from undesired directions, such as side-scattered waves.〈/span〉
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    A systematic study of earthquake detectability using Sentinel-1 Interferometric Wide-Swath data (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉The Sentinel-1 mission comprises two synthetic aperture radar satellites, each with a 12 day orbital repeat, orbiting 6 days apart within a narrow tube. The mission design promises the ability to respond quickly to earthquakes with InSAR, and to facilitate production of interferograms with good interferometric correlation globally. We report on our efforts to study global seismicity using Sentinel-1 Interferometric Wide-Swath data between April 2015 and December 2016. We select 35 potentially detectable terrestrial earthquakes in the range 5.5 ≤ 〈span〉Mw〈/span〉 ≤ 7.8 on the basis of their locations, depths and magnitudes, and process the first post-event interferogram with the shortest possible time-span for each using the ISCE software. We evaluate each interferogram for earthquake deformation signals by visual inspection. We can identify deformation signals attributable to earthquakes in 18 of these interferograms (51%); a further six interferograms (17%) have ambiguous interferometric phase affected by tropospheric noise. 11 events (31%) could not be identified from their interferograms. The majority of these failed detections were due to interferogram decorrelation, particularly apparent for earthquakes that occurred between 15°N and 15°S, where climate conditions promote dense vegetation. The majority of the ambiguous interferograms are affected by tropospheric noise, suggesting that techniques to mitigate such noise could improve detection performance. The largest event we do not detect with Sentinel-1 data is a 〈span〉Mw〈/span〉7.0 earthquake that occurred in Vanuatu in April 2016; we also fail to detect the 2016 〈span〉Mw〈/span〉6.2 Kurayoshi earthquake in one out of two possible 24-day interferograms. We propose these as upper and lower estimates on the magnitude of completeness for earthquakes studied with Sentinel-1 data; to raise the magnitude of completeness we suggest that more frequent (e.g. six day) recurrence may be necessary in low latitude areas.〈/span〉
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    Frequency dependent quality factors from the deconvolution of ambient noise recordings in a borehole in West Bohemia/Vogtland (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉The correct estimation of site-specific attenuation is crucial for the assessment of seismic hazard. Downhole instruments provide in this context valuable information to constrain attenuation directly from data. In this study, we apply an interferometric approach to this problem by deconvolving seismic motions recorded at depth with those recorded at the surface. In doing so, incident and surface-reflected waves can be separated. We apply this technique not only to earthquake data but also to recordings of ambient vibrations. We compute the transfer function between incident and surface-reflected waves in order to infer frequency dependent quality factors for S-waves. The method is applied to a 87 m deep borehole sensor and a co-located surface instrument situated at a hard-rock site in West Bohemia/Vogtland, Germany. We show that the described method provides comparable attenuation estimates using either earthquake data or ambient noise for frequencies between 5-15 Hz. Moreover, a single hour of noise recordings seems to be sufficient to yield stable deconvolution traces and quality factors, thus, offering a fast and easy way to derive attenuation estimates from borehole recordings even in low to mid seismicity regions.〈/span〉
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    Coupled inverse modelling of tight CO2 reservoirs using gravity and ground deformation data (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉Injection of CO〈sub〉2〈/sub〉 into tight reservoirs produces both gravity change and ground deformation, which provide great opportunities for more accurate coupled inverse modelling. In this study, we incorporate signals generated from several synthetic models to estimate the CO〈sub〉2〈/sub〉 distribution in the reservoir. A relationship is found that connects density variations to volumetric changes associated with injected CO〈sub〉2〈/sub〉, taking advantage of a common set of model parameters for both gravitational and geo-mechanical inverse modelling. This is achieved by assuming that the injected CO〈sub〉2〈/sub〉 increases pressure in the reservoir, which in turn generates extra porosity that is then filled in by the CO〈sub〉2〈/sub〉 mass in the generated space. Tikhonov regularization, supported by the Generalized Cross Validation (GCV) technique for finding the optimized model, is used to solve the ill-posed inverse problems. The results indicate that with a combination of gravity and ground deformation monitoring, the uncertainty and ambiguity in gravimetric modelling due to high levels of noise is mitigated by implementing highly accurate ground deformation measurements, which normally have a higher signal to noise ratio.〈/span〉
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    PhaseNet: A Deep-Neural-Network-Based Seismic Arrival Time Picking Method (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉As the number of seismic sensors grows, it is becoming increasingly difficult for analysts to pick seismic phases manually and comprehensively, yet such efforts are fundamental to earthquake monitoring. Despite years of improvements in automatic phase picking, it is difficult to match the performance of experienced analysts. A more subtle issue is that different seismic analysts may pick phases differently, which can introduce bias into earthquake locations. We present a deep-neural-network-based arrival-time picking method called ”PhaseNet” that picks the arrival times of both P and S waves. Deep neural networks have recently made rapid progress in feature learning, and with sufficient training, have achieved super-human performance in many applications. PhaseNet uses three-component seismic waveforms as input and generates probability distributions of P arrivals, S arrivals, and noise as output. We engineer PhaseNet such that peaks in the probability distributions provide accurate arrival times for both P and S waves. PhaseNet is trained on the prodigious available data set provided by analyst-labeled P and S arrival times from the Northern California Earthquake Data Center. The dataset we use contains more than seven hundred thousand waveform samples extracted from over thirty years of earthquake recordings. We demonstrate that PhaseNet achieves much higher picking accuracy and recall rate than existing methods when applied to the waveforms of known earthquakes, which has the potential to increase the number of S-wave observations dramatically over what is currently available. This will enable both improved locations and improved shear wave velocity models.〈/span〉
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    The rupture extent of low frequency earthquakes near Parkfield, CA (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉The low frequency earthquakes (LFEs) that constitute tectonic tremor are often inferred to be slow: to have durations of 0.2 to 0.5 s, a factor of 10 to 100 longer than those of typical 〈span〉MW〈/span〉 1-2 earthquakes. Here we examine LFEs near Parkfield, CA in order to assess several proposed explanations for LFEs’ long durations. We determine LFE rupture areas and location distributions using a new approach, similar to directivity analysis, where we examine how signals coming from various locations within LFEs’ finite rupture extents create differences in the apparent source time functions recorded at various stations. We use synthetic ruptures to determine how much the LFE signals recorded at each station would be modified by spatial variations of the source-station travel time within the rupture area given various possible rupture diameters, and then compare those synthetics with the data. Our synthetics show that the methodology can identify inter-station variations created by heterogeneous slip distributions or complex rupture edges, and thus lets us estimate LFE rupture extents for unilateral or bilateral ruptures. To obtain robust estimates of the sources’ similarity across stations, we stack signals from thousands of LFEs, using an empirical Green’s function approach to isolate the LFEs’ apparent source time functions from the path effects. Our analysis of LFEs in Parkfield implies that LFEs’ apparent source time functions are similar across stations at frequencies up to 8 to 16 Hz, depending on the family. The inter-station coherence observed at these relatively high frequencies, or short wavelengths (down to 0.2 to 0.5 km), suggest that LFEs in each of the 7 families examined occur on asperities. They are clustered in patches with sub-1-km diameters. The individual LFEs’ rupture diameters are estimated to be smaller than 1.1 km for all families, and smaller than 0.5 km and 1 km for the two shallowest families, which were previously found to have 0.2-s durations. Coupling the diameters with the durations suggests that it is possible to model these 〈span〉MW〈/span〉 1-2 LFEs with earthquake-like rupture speeds: around 70% of the shear wave speed. However, that rupture speed matches the data only at the edge of our uncertainty estimates for the family with highest coherence. The data for that family are better matched if LFEs have rupture velocities smaller than 40% of the shear wave speed, or if LFEs have different rupture dynamics. They could have long rise times, contain composite sub-ruptures, or have slip distributions that persist from event to event.〈/span〉
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    Tsunami Squares modeling of the June 24, 2015 Hongyanzi landslide generated river tsunami in Three Gorges Reservoir, China (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉On June 24, 2015, a 230,000 cubic metre landslide slid into the triangle bayou at the intersection of the Yangtze and Daning Rivers and generated a river tsunami that ran up 6.2 metres on the opposite shoreline at Wushan town. The slope failure and resulting waves killed two people and damaged many shipping facilities. Based on field surveys and eyewitness observations, we apply the ‘Tsunami Squares’ method to model the Hongyanzi landslide and its generated waves. Landslide simulations indicate a maximum impact velocity of ∼16 m/s that matches well with an eyewitness video. The computed post-slide mass stopped on the near riverbed with a shape fitting the observed geological profile. Tsunami simulations reveal a large region of wave impacts that coincide with the observed runup heights. The successful reproduction of the dynamics of this landslide-generated river tsunami emphasizes the capacity and efficiency of Tsunami Squares modeling in emergency reaction and risk assessment.〈/span〉
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    Testing performances of the optimal sequence estimation and autoregressive method in the frequency domain for estimating eigenfrequencies and zonal structure coefficients of low-frequency normal modes (2018)
    Oxford University Press
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    Publication Date: 2018
    Description: 〈span〉〈div〉Summary〈/div〉Improvement of global 3D Earth density and velocity models is based in part on measurements of Earth’s normal mode eigenfrequencies and splitting function coefficients. Despite many methods developed inconsistency in measurements still exists and it is difficult to understand which results are more precise, that is which methods introduce less systematic biases in the measurements. Therefore, the main goal of this study is to test the performances of typically used techniques in low-frequency normal mode studies: the optimal sequence estimation stacking method and the autoregressive method in the frequency domain, where validation of the estimates is performed with the phasor walkout method. Motivations for their utilization are their easy and fast implementation and their accurate performances when it comes to eigenfrequency estimates. For this purpose, we first perform the analysis with synthetic seismograms in order to evaluate how the station distributions and noise levels impact the estimates of eigenfrequencies and structure coefficients. Synthetic seismograms are calculated for a 3D realistic Earth model, which includes Earth’s rotation as well as ellipticity and other lateral heterogeneities. They were computed by means of normal mode summation and a perturbation theory for modes up to 1 mHz. The three methods above are also applied to long-period seismometer and superconducting gravimeter data recorded after six earthquakes of magnitude greater than 8.3. Finally, our study shows that the optimal sequence estimation is sensitive to the station distribution under the noise influence, while the autoregressive method for frequency estimation gives us reasonable estimates within the estimated error bars. Moreover, we present new estimates of eigenfrequencies and Q-factors for 〈sub〉0〈/sub〉S〈sub〉2, 0〈/sub〉S〈sub〉3, 2〈/sub〉S〈sub〉1〈/sub〉 and 〈sub〉3〈/sub〉S〈sub〉1〈/sub〉 multiplets. A new value for the 〈span〉c〈/span〉〈sub〉20〈/sub〉 structure coefficient of 〈sub〉0〈/sub〉S〈sub〉2〈/sub〉 multiplet −0.7233 ± 0.0623 μHz is obtained.〈/span〉
    Print ISSN: 2051-1965
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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