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  • energy economics  (62)
  • 550 - Earth sciences  (56)
  • English  (118)
  • 2005-2009  (118)
  • 1980-1984
  • 1
    Keywords: energy ; energy economics
    Description / Table of Contents: Since its founding in 1974, oil supply security has been a core mission of the International Energy Agency. In order to test IEA member countries’ readiness to deal with oil and gas emergencies, IEA member country representatives and the IEA Secretariat participate in peer reviews of member countries every few years. Procedures and institutional arrangements are thoroughly analysed. The publication Oil Supply Security: The Emergency Response of IEA Countries (2007) represents the last full cycle of reviews of IEA member countries (and some non-member countries). Below are updated reviews of member countries’ (and Chile) emergency preparedness in oil and gas carried out in the most recent review cycle (2009-2012).
    Pages: Online-Ressource (384 Seiten)
    Language: English
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  • 2
    Keywords: energy ; energy economics
    Description / Table of Contents: The environmental benefits of renewable energy are well known. But the contribution that they can make to energy security is less widely recognised. This report aims to redress the balance, showing how in electricity generation, heat supply, and transport, renewables can enhance energy security and suggesting policies that can optimise this contribution.
    Pages: Online-Ressource (74 Seiten)
    Language: English
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  • 3
    Keywords: energy ; energy economics
    Description / Table of Contents: China’s rapid economic growth has aroused intense interest around the world. Policy makers, industrialists, investors, environmentalists, researchers and others want to better understand the issues that this populous nation faces as it further develops an already thriving economy largely fuelled by coal. This study sheds light on the Chinese coal supply and transformation sectors. China’s rapid economic growth has aroused intense interest around the world. Policy makers, industrialists, investors, environmentalists, researchers and others want to better understand the issues that this populous nation faces as it further develops an already thriving economy largely fuelled by coal. This study sheds light on the Chinese coal supply and transformation sectors. China’s coal, mined locally and available at a relatively low cost, has brought enormous benefits to energy consumers in China and to those outside the country who enjoy the products of its coal-based economy. Yet from another perspective, China’s coal use has a high cost. Despite progress, health and safety in the thousands of small coal mines lag far behind the standards achieved in China’s modern, large mines. Environmental degradation is a real and pressing problem at all stages of coal production, supply and use. Adding to these burdens, emissions of carbon dioxide are of concern to the Chinese government as it embarks on its own climate protection strategy. Technology solutions are already transforming the way coal is used in China and elsewhere. This study explores the context in which the development and deployment of these technologies can be accelerated. Providing a large amount of new data, it describes in detail the situation in China as well as the experiences of other countries in making coal cleaner. Above all, the report calls for much greater levels of collaboration – existing bi-lateral and multi-lateral co-operation with China on coal is found lacking. China’s growing openness presents many commercial opportunities. Establishing a global market for cleaner coal technologies is key to unlocking the potential of technology – one of ten major recommendations made in this study.
    Pages: Online-Ressource (320 Seiten)
    Language: English
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  • 4
    Keywords: energy ; energy economics
    Description / Table of Contents: The conflicts over the break-up of the former Yugoslavia damaged much of the energy infrastructure and compounded the challenge of providing reliable energy supply. The Western Balkans – composed of Albania, Bosnia and Herzegovina, Croatia, the Former Yugoslav Republic of Macedonia, Montenegro, Serbia and Kosovo – is a complex region facing significant energy challenges. The conflicts over the break-up of the former Yugoslavia damaged much of the energy infrastructure and compounded the challenge of providing reliable energy supply. Electricity systems in many parts of the region remain fragile and in need of investment. A priority across the region is to put into place the institutions, infrastructure and policies that can support the provision of reliable, affordable and sustainable energy. For the Western Balkans as a whole, a key element of the reform effort is the Energy Community Treaty – a regulatory and market framework to which the entire region has now subscribed. This Treaty aims to create an integrated regional market for electricity and gas compatible with the European Union’s internal energy market. This Energy Policy Survey is the first comprehensive review of energy policies and strategies in the Western Balkan region, and also covers important cross-cutting topics such as co-operation and energy trade, oil and gas transportation, and the links between energy and poverty. It identifies and assesses the reforms that are still needed to deliver efficient, modernised energy systems that can assist economic development, address energy poverty and reduce the environmental impacts of energy use.
    Pages: Online-Ressource (416 Seiten)
    Language: English
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  • 5
    Keywords: energy ; energy economics
    Description / Table of Contents: This report explores the vulnerability of heavy industry to carbon leakage and competitiveness loss. It reviews the existing literature on competitiveness and carbon leakage under uneven climate policies. It also suggests a statistical method to track carbon leakage, and applies this methodology to Phase I of the EU emissions trading scheme, for various industrial activities: iron and steel, cement, aluminium and refineries. Finally, it reviews measures to mitigate carbon leakage, as discussed in Australia, Canada, Europe, New Zealand and the US.
    Pages: Online-Ressource (122 Seiten)
    Language: English
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  • 6
    Keywords: energy ; energy economics
    Description / Table of Contents: Industry accounts for one-third of global energy use and almost 40% of worldwide CO2 emissions. Achieving substantial emissions reduction in the future will require urgent action from industry. Industry accounts for one-third of global energy use and almost 40% of worldwide CO2 emissions. Achieving substantial emissions reduction in the future will require urgent action from industry. What are the likely future trends in energy use and CO2 emissions from industry? What impact could the application of best available technologies have on these trends? Which new technologies are needed if these sectors are to fully play their role in a more secure and sustainable energy future? Energy Technology Transitions for Industry addresses these questions through detailed sectoral and regional analyses, building on the insights of crucial IEA findings, such as Energy Technology Perspectives 2008: Scenarios and Strategies to 2050. It contains new indicators and methodologies as well as scenario results for the following sectors: iron and steel, cement, chemicals, pulp and paper and aluminium sectors. The report discusses the prospects for new low-carbon technologies and outlines potential technology transition paths for the most important industrial sectors. This publication is one of three new end-use studies, together with transport and buildings, which look at the role of technologies in transforming the way energy is used in these sectors.
    Pages: Online-Ressource (326 Seiten)
    Language: English
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  • 7
    Keywords: energy ; energy economics
    Description / Table of Contents: This study assesses the long-term economic and environmental effects of introducing price caps and price floors in hypothetical climate change mitigation architecture, which aims to reduce global energy-related CO2 emissions by 50% by 2050. Based on abatement costs in IPCC and IEA reports, this quantitative analysis confirms what qualitative analyses have already suggested: introducing price caps could significantly reduce economic uncertainty. This uncertainty stems primarily from unpredictable economic growth and energy prices, and ultimately unabated emission trends. In addition, the development of abatement technologies is uncertain. With price caps, the expected costs could be reduced by about 50% and the uncertainty on economic costs could be one order of magnitude lower. Reducing economic uncertainties may spur the adoption of more ambitious policies by helping to alleviate policy makers’ concerns of economic risks. Meanwhile, price floors would reduce the level of emissions beyond the objective if the abatement costs ended up lower than forecasted. If caps and floors are commensurate with the ambition of the policy pursued and combined with slightly tightened emission objectives, climatic results could be on average similar to those achieved with “straight” objectives (i.e. with no cost-containment mechanism). This papers reviews current proposals in the UNFCCC negotiations for future mechanisms to report and record Parties’ GHG mitigation actions and commitments, as well as support provided for such actions. It explores the possible purposes, coverage and form of a reporting/recording mechanism post-2012 and highlights the decision points that are needed in order to establish such a mechanism. It examines what information such a mechanism could include in terms of actions, commitments and support, as well as the institutional implications of different design options.
    Pages: Online-Ressource (45 Seiten)
    Language: English
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  • 8
    Keywords: energy ; energy economics
    Description / Table of Contents: Measurable, Reportable and Verifiable Mitigation Actions and Support
    Pages: Online-Ressource (4 Seiten)
    Language: English
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  • 9
    Keywords: energy ; energy economics
    Description / Table of Contents: This paper compares model estimates of national and sectoral GHG mitigation potential across six key OECD GHG-emitting economies: Australia, Canada, the EU, Japan, Mexico and the US. It examines the implications of model structure, baseline and policy assumptions, and assesses GHG mitigation potential estimates across a variety of models, including models that are used to inform climate policy-makers in each of these economies.
    Pages: Online-Ressource (85 Seiten)
    Language: English
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  • 10
    Keywords: energy ; energy economics
    Description / Table of Contents: This paper is a background document on the global chemical and petrochemical sector for the IEA publication Energy Technology Transitions in Industry (IEA, 2009). It provides further, more detailed information on the methodology and data issues for energy efficiency indicators for the sector. The indicators discussed offer insight regarding the energy efficiency improvement potential in the short- to medium-term (by proven technologies). This paper is a background document on the global chemical and petrochemical sector for the IEA publication Energy Technology Transitions in Industry (IEA, 2009). It provides further, more detailed information on the methodology and data issues for energy efficiency indicators for the sector. The indicators discussed offer insight regarding the energy efficiency improvement potential in the short- to medium-term (by proven technologies).
    Pages: Online-Ressource (60 Seiten)
    Language: English
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  • 11
    Keywords: energy ; energy economics
    Description / Table of Contents: This paper explores sectoral approaches as a new set of options to enhance the effectiveness of greenhouse gas reduction policies and to engage emerging economies on a lower emission path. It surveys existing literature and recent policy trends in international climate change discussions, and provides an overview of sectoral approaches and related issues for trade-exposed, greenhouse-gas intensive industries (cement, iron and steel and aluminium). It is also based on interviews conducted by the IEA Secretariat in Australia, China, Europe, Japan, and the United States. Sectoral approaches were also discussed during workshops on technology and energy efficiency policies in industry, following the IEA’s mandate under the Gleneagles Plan of Action.
    Pages: Online-Ressource (77 Seiten)
    Language: English
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  • 12
    Keywords: energy ; energy economics
    Description / Table of Contents: Addressing climate change requires nothing short of an energy revolution. Electricity, mostly generated from fossil fuels, is at the core of this challenge, accounting for more than 40 % of global energy-related CO2 emissions. This issue is most pressing for developing countries where growth in power demand is particularly high, fueling the risk of irreversible investment in CO2-intensive capacity, the so-called “carbon lock-in”. Addressing climate change requires nothing short of an energy revolution. Electricity, mostly generated from fossil fuels, is at the core of this challenge, accounting for more than 40 % of global energy-related CO2 emissions. This issue is most pressing for developing countries where growth in power demand is particularly high, fueling the risk of irreversible investment in CO2-intensive capacity, the so-called “carbon lock-in”. Sectoral Approaches in Electricity – Building Bridges to a Safe Climate shows how the international climate policy framework could effectively support a transition towards low-CO2 electricity systems in developing countries. Sectoral approaches are intended to address sectors that require urgent actions, without waiting for countries to take nation-wide commitments. Once built, power generation capacity lasts for decades. Investing massively in CO2-intensive technologies to meet surging electricity demand will either make it impossible or overly costly to stabilise CO2 concentrations at sustainable levels. The technology mix needed to avoid such a development is clear: higher generation efficiency, CO2 capture and storage, nuclear and renewables. Earlier IEA publications have extensively reviewed developed countries’ efforts to steer generation away from carbon-intensive production modes, from dedicated support to low-carbon technologies to, increasingly, the reliance on CO2 pricing via emissions trading. Following the same logic, there are proposals seeking to use the international carbon market to drive changes at sectoral level in developing countries. This publication illustrates the pros and cons of such an approach in a few key emerging economies. It also asks how international climate policy could support and enhance ongoing efforts on end-use energy efficiency - an essential piece of the climate change/electricity puzzle.
    Pages: Online-Ressource (186 Seiten)
    Language: English
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  • 13
    Keywords: energy ; energy economics
    Description / Table of Contents: CDM
    Pages: Online-Ressource (26 Seiten)
    Language: English
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  • 14
    Keywords: energy ; energy economics
    Description / Table of Contents: This paper offers a preliminary analysis of several scenarios for integration of sectoral approaches in international and national climate policy. We consider four broad types of sectoral approaches: • A global action, i.e. a unilateral move by industry to foster GHG improvements • A global agreement between industry and Parties to the UNFCCC • A series of national policies targeting a sector, with some intergovernmental co-ordination • A sectoral crediting mechanism whereby reductions recorded at a sector level may be eligible for emission credits
    Pages: Online-Ressource (77 Seiten)
    Language: English
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  • 15
    Keywords: energy ; energy economics
    Description / Table of Contents: A key issue for policy makers is how to choose a climate change policy that recognises the uncertainties in the costs and benefits of abatement actions. This paper reviews the economic literature relative to the choice of the economic instruments that could be used to mitigate climate change. Because climate change is driven by the slow build-up of atmospheric concentrations of greenhouse gases, flexible instruments would be more economically efficient than fixed quotas. They may help engage a broader set of countries into a common framework for mitigating climate change, and may facilitate the adoption of relatively more ambitious policies. The certainty of achieving at least some precise levels of emissions would decrease, but the probability of bettering these levels would increase.
    Pages: Online-Ressource (0 Seiten)
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  • 16
    Keywords: energy ; energy economics
    Description / Table of Contents: At the Gleneagles Summit in July 2005, the G8 heads of state asked the International Energy Agency (IEA) to identify measures to map out the path to a “clean, clever and competitive energy future.” This request came in recognition of the Agency’s strengths and offered the opportunity to draw on its existing expertise and programmes. We responded with a broad array of initiatives to develop strategies to mitigate climate change, secure clean energy and achieve sustainable development.
    Pages: Online-Ressource (12 Seiten)
    Language: English
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  • 17
    Keywords: energy ; energy economics
    Description / Table of Contents: This paper discusses coal mine methane emissions (CMM) in the Russian Federation and the potential for their productive utilisation. It highlights specific opportunities for cost-effective reductions of CMM from oil and natural gas facilities, coal mines and landfills, with the aim of improving knowledge about effective policy approaches.
    Pages: Online-Ressource (70 Seiten)
    Language: English
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  • 18
    Keywords: energy ; energy economics
    Description / Table of Contents: The goal of sustainable development is to ensure economic growth today without jeopardising economic development, the social well-being and natural environment of future generations. Energy consumption is closely tied to this goal and plays a key role in determining whether is attainable. As oil, gas and coal still heavily dominate world energy supply, fossil fuels – because of their environmental impact – have been challenged to contribute to a cleaner and sustainable energy future. In 2002, the International Energy Agency Coal Industry Advisory Board issued a position paper at the United Nations World Summit on Sustainable Development that recognised the paramount importance of sustainable development and committed to rally its members to provide evidence of progress towards sustainable development. In this compendium of over fifty case studies, the coal industry demonstrates that practical progress is being made in many areas: communities and people; resource stewardship and environmental impacts; management processes and systems; and along the value chain, in co-operation with customers and suppliers. This publication illustrates that many of the commercial objectives of the coal industry – cost effective achievement of environmental standards, technology research and development, technology transfer and collaboration along the value chain – are also issues that governments can approach positively, in consultation with industry, so that coal is able to have a long-term role in sustainable development.
    Pages: Online-Ressource (97 Seiten)
    Language: English
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  • 19
    Keywords: energy ; energy economics
    Description / Table of Contents: An Assessment of Technology, Policy and Financial Issues Relating to CMM in China, based on Interviews Conducted at Coal Mines in Guizhou and Sichuan Provinces.
    Pages: Online-Ressource (36 Seiten)
    Language: English
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  • 20
    Keywords: energy ; energy economics
    Description / Table of Contents: This chapter considers electrical appliances for home and office, which are produced and consumed in large and increasing numbers in industrialised and, increasingly, in developing economies.
    Pages: Online-Ressource (53 Seiten)
    Language: English
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  • 21
    Keywords: energy ; energy economics
    Description / Table of Contents: This report presents the findings of a new assessment of the techno-economic and policy-related efficiency improvement potential in the North American building stock conducted as part of a wider appraisal of existing buildings in member states of the International Energy Agency. It summarizes results and provides insights into the lessons learned through a broader global review of best practice to improve the energy efficiency of existing buildings. At this time, the report is limited to the USA because of the large size of its buildings market. At a later date, a more complete review may include some details about policies and programs in Canada. If resources are available an additional comprehensive review of Canada and Mexico may be performed in the future.
    Pages: Online-Ressource (108 Seiten)
    Language: English
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  • 22
    Keywords: energy ; energy economics
    Description / Table of Contents: The IEA has identified energy efficiency as essential to achieving a sustainable energy future. In order to improve energy efficiency in industry one of the priority areas for further action is the promotion of more and higher quality energy management (EM) activity. However, there are significant gaps in the current implementation of EM. One method of bridging these gaps would be the creation of an EM Action NetworK (EMAK) to bring practical support to energy managers, connect energy managers to energy policy makers, and interconnect these networks globally.
    Pages: Online-Ressource (68 Seiten)
    Language: English
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  • 23
    Keywords: energy ; energy economics
    Description / Table of Contents: How much can technology contribute to securing adequate and affordable energy supplies and lower CO2 emissions? What energy technologies hold the most promise? How long will it take? At their 2005 summit in Gleneagles, G-8 leaders confronted these questions and decided to act with resolve and urgency. They called upon the International Energy Agency to provide advice on scenarios and strategies for a clean and secure energy future. Energy Technology Perspectives is a response to the G8 request. This innovative work demonstrates how energy technologies can make a difference in a series of global scenarios to 2050. It reviews in detail the status and prospects of key energy technologies in electricity generation, buildings, industry and transport. It assesses ways the world can enhance energy security and contain growth in CO2 emissions by using a portfolio of current and emerging technologies. Major strategic elements of a successful portfolio are energy efficiency, CO2 capture and storage, renewables and nuclear power. While technology does hold great promise for the future, we must act now if we are to unlock the potential of current and emerging technologies and reduce the impact of fossil fuel dependence on energy security and the environment. Energy Technology Perspectives provides detailed technology and policy insights to help policy makers craft sustainable solutions.
    Pages: Online-Ressource (484 Seiten)
    Language: English
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  • 24
    Keywords: energy ; energy economics
    Description / Table of Contents: The world needs ever increasing energy supplies to sustain economic growth and development. But energy resources are under pressure and CO2 emissions from today’s energy use already threaten our climate. What options do we have for switching to a cleaner and more efficient energy future? How much will it cost? And what policies do we need? This second edition of Energy Technology Perspectives addresses these questions, drawing on the renowned expertise of the International Energy Agency and its energy technology network. This publication responds to the G8 call on the IEA to provide guidance for decision makers on how to bridge the gap between what is happening and what needs to be done in order to build a clean, clever and competitive energy future. The IEA analysis demonstrates that a more sustainable energy future is within our reach, and that technology is the key. Increased energy efficiency, CO2 capture and storage, renewables, and nuclear power will all be important. We must act now if we are to unlock the potential of current and emerging technologies and reduce the dependency on fossil fuels with its consequent effects on energy security and the environment. This innovative work demonstrates how energy technologies can make a difference in an ambitious series of global scenarios to 2050. The study contains technology road maps for all key energy sectors, including electricity generation, buildings, industry and transport. Energy Technology Perspectives 2008 provides detailed technology and policy insights to help focus the discussion and debate in energy circles..
    Pages: Online-Ressource (500 Seiten)
    Language: English
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  • 25
    Keywords: energy ; energy economics
    Description / Table of Contents: Existing buildings require over 40% of the world’s total final energy consumption, and account for 24% of world CO2 emissions (IEA, 2006a). Much of this consumption could be avoided through improved efficiency of building energy systems (IEA, 2006a) using current, commercially-viable technology. In most cases, these technologies make economic sense on a life-cycle cost analysis (IEA, 2006b). Moreover, to the extent that they reduce dependence on risk-prone fossil energy sources, energy efficient technologies also address concerns of energy security.
    Pages: Online-Ressource (52 Seiten)
    Language: English
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  • 26
    Keywords: energy ; energy economics
    Description / Table of Contents: When the incandescent lamp was first commercialised the main mode of transport was the horse, trains were powered by steam, balloons were the only means of flight and the telegraph was the state of the art for long-distance communication. Much has changed in the intervening 127 years, but much has also remained the same. In 1879 the incandescent lamp set a new standard in energy-efficient lighting technology, but today good-quality compact fluorescent lamps need only onequarter of the power to provide the same amount of light. Yet most of us continue to rely on the “horse” of the incandescent lamp instead of the “internal combustion engine” of the compact fluorescent lamp. Nor is this the only way in which lighting energy is being wasted. We illuminate rooms when we’re not there, we over-light spaces, we squander available daylight and we underutilise the most efficient street lighting and non-residential building lighting technologies. This might not matter were it not for the severe challenges we face in securing a clean, sustainable and affordable energy system. Electricity generation is the main source of energy-related greenhouse gas emissions and lighting uses one-fifth of its output. Despite having many higher-efficiency and lower-cost alternatives, we continue to use less efficient and more expensive lighting technologies. Is this because we are inherently attached to these older technologies, or is it simply because we stick to what we know when unaware or unsure of the merits of the alternatives? In each of the main lighting end-use sectors (commercial buildings, households, industrial lighting, outdoor lighting and vehicle lighting), this book shows that not only do more cost-effective and higherefficiency alternative choices exist, but that they could be deployed very quickly were the current market barriers to be addressed. Doing this would allow our economies to be stronger and cleaner without sacrificing anything in our quality of life. Moreover, the policies that can bring about this change have been tested and found to work. What is needed is more comprehensive and vigorous implementation in each economy and lighting sector. This book shows us why and how we should do so.
    Pages: Online-Ressource (561 Seiten)
    Language: English
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  • 27
    Keywords: energy ; energy economics
    Description / Table of Contents: This paper provides the latest developments of announced, proposed and existing greenhouse gas emissions trading schemes (ETS) around the world since 2006. It also examines different potential design options for ETS (e.g. coverage, allocation mode, provision for offsets), and how these options are treated in the existing, announced or proposed schemes.
    Pages: Online-Ressource (43 Seiten)
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  • 28
    Keywords: energy ; energy economics
    Description / Table of Contents: The aim of this IEA Information Paper is to help policy makers and other stakeholders understand the challenges facing the incorporation of high efficiency combined heat and power (CHP) into greenhouse gas (GHG) Emissions Trading Schemes (ETSs) – and to propose options for overcoming them.
    Pages: Online-Ressource (27 Seiten)
    Language: English
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  • 29
    Unknown
    Paris : OECD/IEA
    Keywords: energy ; energy economics
    Description / Table of Contents: Since WEO-2008, the economic downturn has led to a drop in energy use, CO2 emissions and energy investment. Is this an opportunity to arrest climate change or a threat that any economic upturn might be stifled at birth? What package of commitments and measures should the climate negotiators at Copenhagen put together if they really want to stop global temperatures rising? How much would it cost? And how much might the developed world have to pay to finance action elsewhere? How big is the gas resource base and what is the typical pattern of production from a gas field? What does the unconventional gas boom in the United States mean for the rest of the world? Are we headed for a global gas glut? What role will gas play in the future energy mix? And how might the way gas is priced change? All these questions and many others are answered in WEO-2009. The data are extensive, the projections more detailed than ever and the analyses compelling.
    Pages: Online-Ressource (696 Seiten)
    ISBN: 9789264061309
    Language: English
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  • 30
    Unknown
    Paris : OECD/IEA
    Keywords: energy ; energy economics
    Description / Table of Contents: This publication examines global energy trends and sets out projections for supply and demand of oil, gas, coal and power sectors. It then goes on to present an alternative policy scenario which considers the energy challenges we need to address to secure a sustainable energy future, identifies priority areas for action and key instruments, and measures both the costs and cost-effectiveness of alternative policies. Other issues discussed include: the impact of higher energy prices, current trends in oil and gas investment, the prospects for nuclear power, the outlook for biofuels, energy for cooking in developing countries, and an in-depth study of the energy sector in Brazil.
    Pages: Online-Ressource (596 Seiten)
    Edition: 2nd ed.
    ISBN: 9264109897
    Language: English
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  • 31
    Keywords: energy ; energy economics
    Description / Table of Contents: World leaders have pledged to act to change the energy future. Some new policies are in place. But the trends in energy demand, imports, coal use and greenhouse gas emissions to 2030 in this year’s World Energy Outlook are even worse than projected in WEO 2006. China and India are the emerging giants of the world economy. Their unprecedented pace of economic development will require ever more energy, but it will transform living standards for billions. There can be no question of asking them selectively to curb growth so as to solve problems which are global. So how is the transition to be achieved to a more secure, lower-carbon energy system? WEO 2007 provides the answers. With extensive statistics, projections in three scenarios, analysis and advice, it shows China, India and the rest of the world why we need to co-operate to change the energy future and how to do it.
    Pages: Online-Ressource (663 Seiten)
    ISBN: 9789264027305
    Language: English
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  • 32
    Keywords: energy ; energy economics
    Description / Table of Contents: This year's edition of this key source for global energy statistics, projections and analysis focuses on trends and developments in the major oil and gas producing countries of the Middle East and North Africa (MENA) region, in order to assess whether energy production from this region will increase sufficiently to satisfy global demand. In addition to providing updated projections of world energy demand and supply to 2030, the publication analyses regional trends for oil, natural gas, electricity and water desalination with dedicated chapters on Algeria, Egypt, Iran, Iraq, Kuwait, Libya, Qatar, Saudi Arabia, and the United Arab Emirates. It also includes a 'deferred investment scenario' setting out an analysis of how global energy markets might evolve in a changed investment situation; an in-depth analysis of the global refining industry; and a review of the MENA power and water desalination sectors.
    Pages: Online-Ressource (629 Seiten)
    ISBN: 9264109498
    Language: English
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  • 33
    Unknown
    Paris : OECD/IEA
    Keywords: energy ; energy economics
    Description / Table of Contents: Are world oil and gas supplies under threat? How could a new international accord on stabilising greenhouse-gas emissions affect global energy markets? World Energy Outlook 2008 answers these and other burning questions. WEO-2008 draws on the experience of another turbulent year in energy markets to provide new energy projections to 2030, region by region and fuel by fuel. It incorporates the latest data and policies. WEO-2008 focuses on two pressing issues facing the energy sector today: - Prospects for oil and gas production: How much oil and gas exists and how much can be produced? Will investment be adequate? Through field-by-field analysis of production trends at 800 of the world’s largest oilfields, an assessment of the potential for finding and developing new reserves and a bottom-up analysis of upstream costs and investment, WEO-2008 takes a hard look at future global oil and gas supply. - Post-2012 climate scenarios: What emissions limits might emerge from current international negotiations on climate change? What role could cap-and-trade and sectoral approaches play in moving to a low-carbon energy future? Two different scenarios are assessed, one in which the atmospheric concentration of emissions is stabilised at 550 parts per million (ppm) in CO2 equivalent terms and the second at the still more ambitious level of 450 ppm. The implications for energy demand, prices, investment, air pollution and energy security are fully spelt out. This groundbreaking analysis will enable policy makers to distill the key choices as they strive to agree in Copenhagen in 2009 on a post-Kyoto climate framework. With extensive data, detailed projections and in-depth analysis, WEO-2008 provides invaluable insights into the prospects for the global energy market and what they mean for climate change.
    Pages: Online-Ressource (569 Seiten)
    ISBN: 9789264045606
    Language: English
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  • 34
    Keywords: energy ; energy economics
    Description / Table of Contents: Since 2005, the OECD and IEA have been examining the possibility to expand international carbon markets by granting broader access to developing countries. This note summarises key elements in this area, drawing on earlier publications done under the aegis of the Annex I Expert Group on the UNFCCC (AIXG).
    Pages: Online-Ressource (6 Seiten)
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  • 35
    Keywords: energy ; energy economics
    Description / Table of Contents: This article assesses the long-term economic and climatic effects of introducing price caps and price floors in hypothetical global climate change mitigation policy. Based on emission trends, abatement costs and equilibrium climate sensitivity from IPCC and IEA reports, this quantitative analysis confirms that price caps could significantly reduce economic uncertainty. This uncertainty stems primarily from unpredictable economic growth and energy prices, and ultimately unabated emission trends. In addition, the development of abatement technologies is uncertain. Furthermore,this analysis shows that rigid targets may entail greater economic risks with little or no comparative advantage for the climate. More ambitious emission objectives, combined with price caps and price floors, could still entail significantly lower expected costs while driving similar, or even slightly better, climatic outcomes in probabilistic terms.
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  • 36
    Keywords: energy ; energy economics
    Description / Table of Contents: This article assesses the long-term economic and climatic effects of introducing price caps and price floors in hypothetical global climate change mitigation policy. Based on emission trends, abatement costs and equilibrium climate sensitivity from IPCC and IEA reports, this quantitative analysis confirms that price caps could significantly reduce economic uncertainty. This uncertainty stems primarily from unpredictable economic growth and energy prices, and ultimately unabated emission trends.In addition, the development of abatement technologies is uncertain. Furthermore,this analysis shows that rigid targets may entail greater economic risks with little or no comparative advantage for the climate. More ambitious emission objectives, combined with price caps and price floors, could still entail significantly lower expected costs while driving similar, or even slightly better, climatic outcomes in probabilistic terms.
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  • 37
    Keywords: energy ; energy economics
    Description / Table of Contents: Investment in the energy system of tomorrow requires substantial resources and informed policy making to achieve energy-security,economic and environmental objectives. The International Energy Agency (IEA) estimates 26 trillion USD in investments will be needed in the energy sector by 2030 to sustain current energy trends. Energy business-as-usual, however, and the resulting environmental impacts, are not sustainable as they result in energy insecurity and climate damages. Investment in the energy system of tomorrow requires substantial resources and informed policy making to achieve energy-security, economic and environmental objectives. The International Energy Agency (IEA) estimates 26 trillion USD in investments will be needed in the energy sector by 2030 to sustain current energy trends. Energy business-as-usual, however, and the resulting environmental impacts, are not sustainable as they result in energy insecurity and climate damages.
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  • 38
    Keywords: energy ; energy economics
    Description / Table of Contents: This information paper provides policy makers and managers, facing tough energy policy challenges, with a wider perspective of how the same issues are being addressed by different IEA member countries. The topics included are: Government structures for co-ordinating energy and climate policies The use of long-term energy forecasts and scenarios Progress in the delivery of key energy security policies
    Pages: Online-Ressource (91 Seiten)
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  • 39
    Keywords: energy ; energy economics
    Description / Table of Contents: Today’s investment decisions in key sectors such as energy, forestry or transport have significant impacts on the levels of greenhouse gas (GHG) emissions over the coming decades. Given the economic and environmental long-term implications of capital investment and retirement, a climate mitigation regime should aim to encourage capital investment in climate-friendly technologies. Many factors affect technology choice and the timing of investment, including investor expectations about future prices and policies. Recent international discussions have focused on the importance of providing more certainty about future climate policy stringency. The design of commitment periods can play a role in creating this environment. This paper assesses how the length of commitment periods influences policy uncertainty and investment decisions. In particular, the paper analyses the relationship between commitment period length and near term investment decisions in climate friendly technology.
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  • 40
    Keywords: energy ; energy economics
    Description / Table of Contents: This special early excerpt of WEO-2009 is a contribution from the energy sector to inform the negotiations leading into Copenhagen. It summarises the results of a fully-updated Reference Sceario, detailing by sector and by country/region the trends in energy use and emissions and the investments and funding needed to meet the 450 Scenario.
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  • 41
    Keywords: energy ; energy economics
    Description / Table of Contents: The purpose of this report is to first present each of these criticisms in what we hope is an accurate manner. We then respond to each criticism based on actual experience with energy efficiency policies, programmes and measures in OECD countries. From this review, we draw conclusions regarding the merits of each criticism. We also make suggestions as to how energy efficiency proponents, analysts and policy makers could improve the design and analysis of future energy efficiency policies and programmes, based on the issues raised by the critics.
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  • 42
    Keywords: energy ; energy economics
    Description / Table of Contents: Modern biomass, and the resulting useful forms of bioenergy produced from it, are anticipated by many advocates to provide a significant contribution to the global primary energy supply of many IEA member countries during the coming decades. For non-member countries, particularly those wishing to achieve economic growth as well as meet the goals for sustainable development, the deployment of modern bioenergy projects and the growing international trade in biomass-based energy carriers offer potential opportunities.
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  • 43
    Keywords: energy ; energy economics
    Description / Table of Contents: The world’s largest gas producer and exporter, Russia has an enormous energy saving potential. At least 30 billion cubic meters – a fifth of Russian exports to European OECD countries - could be saved every year by enhanced technology or energy efficiency. As the era of cheap gas in Russia comes to an end, this potential saving is increasingly important for Russians and importing countries. And as domestic gas prices increase, efficiency investments will become increasingly economic – not to mention the incentive for Gazprom to enhance its efficiency against a backdrop of high European gas prices. Optimising Russian Natural Gas: Reform and Climate Policy analyses and estimates the potential savings and the associated reductions in greenhouse gas emissions in the oil extraction (flaring), gas transmission and distribution sectors. Achieving these savings will require linking long-standing energy efficiency goals with energy sector reforms, as well as climate policy objectives. The book also describes Russia’s emerging climate policy and institutional framework, including work still ahead before the country is eligible for the Kyoto Protocol’s flexibility mechanisms and can attract financing for greenhouse gas reductions. Optimising Russian Natural Gas: Reform and Climate Policy stresses the need for Russia to tap the full potential of energy savings and greenhouse gas emission reductions through a more competitive environment in the gas sector to attract timely investments.
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  • 44
    Keywords: energy ; energy economics
    Description / Table of Contents: At their 2007 Summit in Heiligendamm, G8 leaders called on countries to “adopt instruments and measures to significantly increase the share of combined heat and power (CHP) in the generation of electricity.” As a result, energy, economic, environmental and utility regulators are looking for tools and information to understand the potential of CHP and to identify appropriate policies for their national circumstances. This report forms the first part of the response. It includes answers to policy makers’ questions about the potential economic, energy and environmental benefits of an increased policy commitment to CHP. It also includes for the first time integrated IEA data on global CHP installations, and analyses the benefits of increased CHP investment in the G8+5 countries. A companion report will be produced later in 2008 to document best practice policy approaches that have been used to expand the use of CHP in a variety of countries.
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  • 45
    Keywords: energy ; energy economics
    Description / Table of Contents: Energy security, environmental protection and economic prosperity all pose major challenges for today’s energy decision makers. To meet these challenges, innovation, the adoption of new cost effective technologies, and better use of existing energy-efficient technologies are key elements. The world is not on course for a sustainable energy future – with security concerns and CO2 emissions projected to more than double by 2050. But this alarming outlook can be changed. A recent major IEA analysis “Energy Technology Perspectives – Scenarios and Strategies to 2050” (IEA, 2006) demonstrate that by developing and employing technologies that already exist or are under development, the world could be brought onto a much more sustainable energy path. The costs of achieving a more sustainable energy future are not disproportionate, but they will require substantial effort and investment by both the public and private sectors. There will be significant additional transitional costs related to RD&D and deployment programmes to commercialise many of the technologies over the next couple of decades. Governments will continue to play a major role in energy technology R&D – in defining policies and funding them. How can IEA member country governments be sure they are making the right choices? One answer is by learning from the experience of others – through the use of peer reviews. The IEA version of the peer review – the in-depth review - is a well established tool used since the IEA was created more than 30 years ago. It provides for its members a framework to examine and compare experiences and discuss “best practices” in a host of energy policy areas, including research, development and technology policy. Making the most of the in-depth review process, as well as recommendations emanating from it, offers the promise of better and more well-informed R&D policies – ultimately assisting the development of the new energy technologies that we so urgently need.
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  • 46
    Keywords: energy ; energy economics
    Description / Table of Contents: Climate change is a major challenge. Secure, reliable and affordable energy supplies are needed for economic growth, but increases in the associated carbon dioxide (CO2) emissions are the cause of major concern. About 69% of all CO2 emissions, and 60% of all greenhouse gas emissions, are energy-related. Recent IEA analysis in Energy Technology Perspectives 2008 (ETP) projects that the CO2 emissions attributable to the energy sector will increase by 130% by 2050 in the absence of new policies or supply constraints, largely as a result of increased fossil fuel usage. The 2007 Intergovernmental Panel on Climate Change (IPCC) 4th Assessment Report indicates that such a rise in emissions could lead to a temperature increase in the range of 4-7°C, with major impacts on the environment and human activity. It is widely agreed that a halving of energy-related CO2 emissions is needed by 2050 to limit the expected temperature increase to less than 3 degrees. To achieve this will take an energy technology revolution involving increased energy effi ciency, increased renewable energies and nuclear power, and the decarbonisation of power generation from fossil fuels. The only technology available to mitigate greenhouse gas (GHG) emissions from large-scale fossil fuel usage is CO2 capture and storage (CCS). The ETP scenarios demonstrate that CCS will need to contribute nearly one-fi fth of the necessary emissions reductions to reduce global GHG emissions by 50% by 2050 at a reasonable cost. CCS is therefore essential to the achievement of deep emission cuts. Most of the major world economies recognise this, and have CCS technology development programmes designed to achieve commercial deployment. In fact, at the 2008 Hokkaido Toyako summit, the G8 countries endorsed the IEA’s recommendation that 20 large-scale CCS demonstration projects need to be committed by 2010, with a view to beginning broad deployment by 2020. Ministers specifi cally asked for an assessment by the IEA in 2010 of the implementation of these recommendations, as well as an assessment of progress towards accelerated deployment and commercialisation. Current spending and activity levels are nowhere near enough to achieve these deployment goals. CCS technology demonstration has been held back for a number of reasons. In particular, CCS technology costs have increased signifi cantly in the last 5 years. In the absence of suitable fi nancial mechanisms to support CCS, including signifi cant public and private funding for nearterm demonstrations and longer-term integration of CCS into GHG regulatory and incentive schemes, high costs have precluded the initiation of large-scale CCS projects. The regulatory framework necessary to support CCS projects also needs to be further developed. Despite important progress, especially in relation to international marine protection treaties, no country has yet developed the comprehensive, detailed legal and regulatory framework that is necessary effectively to govern the use of CCS. CCS is also poorly understood by the general public. As a result, there is a general lack of public support for CCS as compared to several other GHG mitigation options. This report attempts to address some of these issues by collecting the best global information about the cost and performance of CO2 capture, transport and storage technologies throughout the CCS project chain. Chapters 1-4 contain this information, and use it to conduct a scenario analysis of the role of CCS in climate change mitigation. Chapter 5 discusses the fi nancial incentive mechanisms that governments can use to provide both short- and long-term incentives for CCS. This chapter also contains an expansion and update of the 2007 IEA publication Legal Aspects of CO2 Storage: Updates and Recommendations and examines the current state of public awareness and acceptance of the relevant technologies. Chapter 6 includes a review of the status of CCS policies, research and demonstration programmes, and CO2 storage prospects for several regions and countries. Chapter 7 concludes with a proposed CCS roadmap that includes the necessary technical, political, fi nancial and international collaboration activities to enable CCS to make the contribution it needs to make to global GHG mitigation in the coming decades.
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  • 47
    Keywords: energy ; energy economics
    Description / Table of Contents: This paper assesses the policy questions as highlighted in the relevant COP/MOP 2 decision, particularly leaks (or seepage) and permanence for geological storage, project boundaries and liability issues, and leakage, as well as a few others raised by some Parties. Since any emissions or leaks during the separation, capture and transport phases would occur during the crediting period of the project (and would therefore be accounted for as project emissions), the paper focuses its analyses for leaks and liability on storage, as it is in this part of the CCS process that long-term leaks could occur.
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  • 48
    Keywords: energy ; energy economics
    Description / Table of Contents: During 2004, oil prices reached levels unprecedented in recent years. Though world oil markets remain adequately supplied, high oil prices do reflect increasingly uncertain conditions. Many IEA member countries and nonmember countries alike are concerned about oil costs and oil security and are looking for ways to improve their capability to handle market volatility and possible supply disruptions in the future. This book aims to provide assistance.
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  • 49
    Keywords: energy ; energy economics
    Description / Table of Contents: This paper first reviews proposals for the design of sectoral and related market mechanisms currently debated, both in the UNFCCC negotiations, and in different domestic legislative contexts. Secondly, it addresses the possible principles and technical requirements that Parties may wish to consider as the foundations for further elaboration of the mechanisms. The third issue explored herein is domestic implementation of sectoral market mechanisms by host countries, incentives to move to new market mechanisms, as well as how the transition between current and future mechanisms could be managed.
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  • 50
    Keywords: energy ; energy economics
    Description / Table of Contents: This report explores the effects of the EU emissions trading scheme on the aluminium sector (i.e. competitiveness loss and carbon leakage). With its very high electricity intensity, primary aluminium stands out in the heavy industry picture: a sector whose emissions are not capped in the present EU ETS, European aluminium smelters still stand to lose profit margins and, possibly, market shares, as electricity prices increase following CO2 caps on generators’ emissions - the famous pass-through of CO2 prices into electricity prices. The analysis includes a method of quantification of this issue, based on two indicators: profit margins and trade flows. As the EU is at the forefront of such policy, the paper provides policy messages to all countries on how trade exposed energy-intensive industries can be ‘moved’ by carbon constraint. This also is a contentious topic in Australia, Japan, New Zealand, and the US, where ambitious climate policies – including cap-and-trade systems – are currently debated.
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  • 51
    Keywords: energy ; energy economics
    Description / Table of Contents: Coal Mine Methane in China
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  • 52
    Keywords: energy ; energy economics
    Description / Table of Contents: The report, released at the COGEN Europe meeting in Brussels on 21 April 2009, provides “best practice” policy approaches used by different countries to expand CHP and district energy use. The report follows the 2008 IEA CHP study as part of the IEA International CHP Collaborative effort.
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  • 53
    Keywords: energy ; energy economics
    Description / Table of Contents: Due to the growth of international attention on the problem of climate change combined with the attractiveness of methane mitigation technologies, the capture and use of methane in agriculture, coal mines, landfills, and the oil and gas sector has increasingly become popular over the past few years. Highlighting this, several countries hosted the international “Methane to Market” Partnership Conference and Exposition in October 2007 in Beijing, China.
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  • 54
    Keywords: energy ; energy economics
    Description / Table of Contents: This paper examines what “sustainable development policies and measures” (SD-PAMs) could be, and how they could be implemented and could fit into a post-2012 climate regime. This paper assumes that the option to implement SD-PAMs instead of quantified GHG emission commitments post-2012 is an option that would be likely to be only open to non-Annex I countries. There are several key, but unanswered, questions related to SD-PAMs. These include policy-related issues such as which countries could take on commitments to implement SD-PAMs (rather than quantified emission commitments)? Why would particular countries decide to take on such commitments? They also include questions related to how SD-PAMs could be implemented. For many other options for possible post-2012 GHG mitigation actions, including by non-Annex I countries, have also been proposed. However, this paper focuses solely on SD-PAMs.
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  • 55
    Keywords: energy ; energy economics
    Description / Table of Contents: The ideas expressed in this paper are those of the author and do not necessarily represent views of the OECD, the IEA, or their member countries, or the endorsement of any approach described herein.
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  • 56
    Keywords: energy ; energy economics
    Description / Table of Contents: Sectoral Crediting Mechanisms for Greenhouse Gas Mitigation: Institutional and Operational Issues
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  • 57
    Keywords: energy ; energy economics
    Description / Table of Contents: This book describes why temporary shortages of electricity supplies occur even in the wealthiest countries with the most sophisticated electricity networks. Most shortages are local and minor and easily addressed. But, in other cases, the shortages persist for days, weeks, or even years and involve millions of people, and this is the target of this book. The reasons for these shortages are incredibly diverse: from forest fires to safety problems at power stations, from problems in electricity market liberalisation to heat or cold waves. These events can happen anywhere – and they do! The results are blackouts, brownouts and other curtailments on electricity consumption.
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  • 58
    Keywords: energy ; energy economics
    Description / Table of Contents: The aim of this paper is to describe and analyse current approaches to encourage energy efficiency in building codes for new buildings. Based on this analysis the paper enumerates policy recommendations for enhancing how energy efficiency is addressed in building codes and other policies for new buildings. This paper forms part of the IEA work for the G8 Gleneagles Plan of Action. These recommendations reflect the study of different policy options for increasing energy efficiency in new buildings and examination of other energy efficiency requirements in standards or building codes, such as energy efficiency requirements by major renovation or refurbishment. In many countries, energy efficiency of buildings falls under the jurisdiction of the federal states. Different standards cover different regions or climatic conditions and different types of buildings, such as residential or simple buildings, commercial buildings and more complicated high-rise buildings. There are many different building codes in the world and the intention of this paper is not to cover all codes on each level in all countries. Instead, the paper details different regions of the world and different ways of standards. In this paper we also evaluate good practices based on local traditions. This project does not seek to identify one best practice amongst the building codes and standards. Instead, different types of codes and different parts of the regulation have been illustrated together with examples on how they have been successfully addressed. To complement this discussion of efficiency standards, this study illustrates how energy efficiency can be improved through such initiatives as efficiency labelling or certification, very best practice buildings with extremely low- or no-energy consumption and other policies to raise buildings’ energy efficiency beyond minimum requirements. When referring to the energy saving potentials for buildings, this study uses the analysis of recent IEA publications, including the World Energy Outlook 2006 (WEO) and Energy Technology Perspective (ETP). Here, we based the estimates of potentials on the scenarios presented, in particular on the predictions of consumption in the residential and commercial sectors in the WEO 2006. Finally, this paper recommends policies which could be used to realise these large and feasible energy saving potentials in new buildings, and the use of building codes by renovation or refurbishment. The paper addresses as well experts as policy makers and interest groups with particular interest in energy efficiency in new buildings. Some parts might hence seem simplified and known for some experts, such as the discussions on barriers or the climatic impact on efficiency. Other parts might on the other hand seem a little technical for the policy oriented reader or for some interest groups. But there are large and compelling opportunities, this is recognised by many experts as well as there is a will to act by many policymakers and governments. But still too little happen because there are barriers and low understanding also in the institutional parts or little communications between different layers of the implementation process. The paper hence aims to bridge these gabs by addressing several different groups at the same time. So hopefully the reader will accept these inconveniences.
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  • 59
    Keywords: energy ; energy economics
    Description / Table of Contents: This study assesses the long-term economic and environmental effects of introducing price caps and price floors in hypothetical climate change mitigation architecture, which aims to reduce global energy-related CO2 emissions by 50% by 2050. Based on abatement costs in IPCC and IEA reports, this quantitative analysis confirms what qualitative analyses have already suggested: introducing price caps could significantly reduce economic uncertainty. This uncertainty stems primarily from unpredictable economic growth and energy prices, and ultimately unabated emission trends. In addition, the development of abatement technologies is uncertain. See also Assessing the value of price caps and floors, November 2009 This study assesses the long-term economic and environmental effects of introducing price caps and price floors in hypothetical climate change mitigation architecture, which aims to reduce global energy-related CO2 emissions by 50% by 2050. Based on abatement costs in IPCC and IEA reports, this quantitative analysis confirms what qualitative analyses have already suggested: introducing price caps could significantly reduce economic uncertainty. This uncertainty stems primarily from unpredictable economic growth and energy prices, and ultimately unabated emission trends. In addition, the development of abatement technologies is uncertain. With price caps, the expected costs could be reduced by about 50% and the uncertainty on economic costs could be one order of magnitude lower. Reducing economic uncertainties may spur the adoption of more ambitious policies by helping to alleviate policy makers’ concerns of economic risks. Meanwhile, price floors would reduce the level of emissions beyond the objective if the abatement costs ended up lower than forecasted. If caps and floors are commensurate with the ambition of the policy pursued and combined with slightly tightened emission objectives, climatic results could be on average similar to those achieved with “straight” objectives (i.e. with no cost-containment mechanism).
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  • 60
    Keywords: energy ; energy economics
    Description / Table of Contents: The IEA is undertaking a strategic inititive to improve global energy data and analysis by better incorporating energy sector methane emissions and recovery opportunities. The ultimate goal of this effort is to expand opportunities for cost-effective methane reductions from oil and natural gas facilities, landfills, and coal mines. Methane (CH4) is a hydrocarbon that is the primary component of natural gas. It is also a potent greenhouse gas(GHG), meaning that its presence in the atmosphere affects the earth’s temperature and climate system. As a result, efforts to reduce methane emissions by using methane for energy production can yield environmental, economic, and energy benefits.
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  • 61
    Keywords: energy ; energy economics
    Description / Table of Contents: This paper has been produced as part of the work programme in support of the Gleneagles Plan of Action (GPOA), where the IEA was requested to “undertake a study to review existing global appliance standards and codes”. In accordance with the G8 request, this study investigates the coverage and impact of forms of minimum energy performance standards (MEPS) and comparative energy labelling programmes; which comprise the cornerstone of most IEA countries national energy efficiency strategy. This scope also reflects governments’ aspirations to achieve ambitious targets for reducing greenhouse gas emissions. As a result, this study does not address endorsement labelling and associated voluntary programmes, although these are also important policy tools for national energy efficiency strategies.
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  • 62
    Keywords: energy ; energy economics
    Description / Table of Contents: When William Shakepeare wrote Love’s Labour’s Lost he would have used light from tallow candles at a cost (today) of £12,000 per million-lumen hours. The same amount of light from electric lamps now costs only £2! But today’s low-cost illumination still has a dark side. Globally, lighting consumes more electricity than is produced by either hydro or nuclear power and results in CO2 emissions equivalent to two thirds of the world’s cars. A standard incandescent lamp may be much more efficient than a tallow candle, but it is far less efficient than a high-pressure sodium lamp. Were inefficient light sources to be replaced by the equivalent efficient ones, global lighting energy demand would be up to 40% less at a lower overall cost. Larger savings still could be realised through the intelligent use of controls, lighting levels and daylight. But achieving efficient lighting is not just a question of technology; it requires policies to transform current practice. This book documents the broad range of policy measures to stimulate efficient lighting that have already been implemented around the world and suggests new ways these could be strengthened to prevent light’s labour’s from being lost.
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  • 63
    Publication Date: 2020-02-12
    Description: We use traveltime data of local earthquakes and controlled sources observed by a large, temporary, amphibious seismic network to reveal the anatomy of the southcentral Chilean subduction zone (37–39°S) between the trench and the magmatic arc. At this location the giant 1960 earthquake (M = 9.5) nucleated and ruptured almost 1000 km of the subduction megathrust. For the three-dimensional tomographic inversion we used 17,148 P wave and 10,049 S wave arrival time readings from 439 local earthquakes and 94 shots. The resolution of the tomographic images was explored by analyzing the model resolution matrix and conducting extensive numerical tests. The downgoing lithosphere is delineated by high seismic P wave velocities. High v p/v s ratio in the subducting slab reflects hydrated oceanic crust and serpentinized uppermost oceanic mantle. The subducting oceanic crust can be traced down to a depth of 80 km, as indicated by a low velocity channel. The continental crust extends to approximately a 50-km depth near the intersection with the subducting plate. This suggests a wide contact zone between continental and oceanic crust of about 150 km, potentially supporting the development of large asperities. Eastward the crustal thickness decreases again to a minimum of about a 30-km depth. Relatively low v p/v s at the base of the forearc does not support a large-scale serpentinization of the mantle wedge. Offshore, low v p and high v p/v s reflect young, fluid-saturated sediments of forearc basins and the accretionary prism.
    Keywords: 550 - Earth sciences
    Language: English
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  • 64
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
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  • 65
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
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  • 66
    Publication Date: 2020-02-12
    Description: Providing quantitative microzonation results that can be taken into account in urban land-use plans is a challenging task that requires collaborative efforts between the seismological and engineering communities. In this study, starting from the results obtained by extensive geophysical and seismological investigations, we propose and apply an approach to the Gubbio basin (Italy) that can be easily implemented for cases of moderate-to-low ground motion and that takes into account not only simple 1D, but also more complicated 3D effects. With this method, the sites inside the basin are classified by their fundamental resonance frequencies, estimated from the horizontal-to-vertical spectral ratio applied to noise recordings (HVNSR). The correspondence between estimates of the fundamental frequency from this method and those derived from earthquake recordings was verified at several calibration sites. The amplification factors used to correct the response spectra are computed by the ratio between the response spectra at sites within the basin and the response spectra at a hard-rock site using data from two seismic transects. Empirical amplification functions are then assigned to the fundamental frequencies after applying an interpolation technique. The suitability of the estimated site-specific correction factors for response spectra was verified by computing synthetic response spectra for stations within the basin, starting from the synthetic recording at a nearby rock station, and comparing them with observed ones.
    Keywords: 550 - Earth sciences
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  • 67
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: English
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  • 68
    Publication Date: 2020-02-12
    Description: A temporal seismic network recorded local seismicity along a 130 km long segment of the transpressional dextral strike-slip Liquiñe-Ofqui fault zone (LOFZ) in southern Chile. Seventy five shallow crustal events with magnitudes up to M(tief)w 3.8 and depths shallower than 25 km were observed in an 11-month period mainly occurring in different clusters. Those clusters are spatially related to the LOFZ, to the volcanoes Chaitén, Michinmahuida and Corcovado, and to active faulting on secondary faults. Further activity along the LOFZ is indicated by individual events located in direct vicinity of the surface expression of the LOFZ. Focal mechanisms were calculated using deviatoric moment tensor inversion of body wave amplitude spectra which mostly yield strike-slip mechanisms indicating a NE–SW direction of the P-axis for the LOFZ at this latitude. The seismic activity reveals the present-day activity of the fault zone. The recent M(tief)w 6.2 event near Puerto Aysén, Southern Chile at 45.4°S on April 21, 2007 shows that the LOFZ is also capable of producing large magnitude earthquakes and therefore imposing significant seismic hazard to this region.
    Keywords: 550 - Earth sciences
    Language: English
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  • 69
    Publication Date: 2020-02-12
    Description: We thank Dahlen & Nolet for the comments (DN05) on our paper (HH05). There are many points of agreement, as we think is clear from HH05, but we respectfully continue to differ in opinion on some fundamental aspects of the finite frequency sensitivity kernels known as 'banana doughnut' kernels—hereinafter BDKs, as per the original nomenclature of Dahlen et al.—and their benefit to global tomography. In contrast to DN05's summary statement, HH05's main concern about BDKs is not the effect of uncertainty in the earthquake source signature or origin time. HH05 argue that (i) the evaluation of sensitivity kernels in simple media has limitations for the interpretation of broad-band signals by means of (linearized) finite frequency tomography; (ii) finite frequency kernels are (indeed) oscillatory, but in general heterogeneity their structure will be complex and different from BD features; (iii) the resolved length scales of model variations are induced by the spectral scales present in the data, which makes the notion of 'hole' irrelevant; and (iv) with the need for 'damping' (regularization) and without a basis that matches properly the multi-scale aspects of finite frequency sensitivity, ray theory or finite frequency theory inversions are likely to yield results that are practically the same.
    Keywords: 550 - Earth sciences
    Language: English
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  • 70
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    In:  Geophysical Research Letters
    Publication Date: 2020-02-12
    Description: The 26 December 2004 Sumatra-Andaman earthquake of Mw 9.3 triggered a massive tsunami in the Indian Ocean. We here report on observations of the Indian Ocean tsunami at broadband seismic stations located on islands in the area. The tsunami induces long-period (〉1000 s) signals on the horizontal components of the sensor. Frequency-time analysis shows that the long-period signals cannot be due to seismic surface waves, but that it arrives at the expected time of the tsunami. The waveforms are well correlated to tide gauge observations at a location where both observations are available. To explain the signals we favour tilt due to coastal loading but we cannot at the present stage exclude gravitational effects. The density of broadband stations is expected to increase rapidly in the effort of building an earthquake monitoring system. They may unexpectedly become useful tsunami detectors as well.
    Keywords: 550 - Earth sciences
    Language: English
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  • 71
    Publication Date: 2020-02-12
    Description: Magnetotelluric (MT) data from 66 sites along a 45-km-long profile across the San Andreas Fault (SAF) were inverted to obtain the 2-D electrical resistivity structure of the crust near the San Andreas Fault Observatory at Depth (SAFOD). The most intriguing feature of the resistivity model is a steeply dipping upper crustal high-conductivity zone flanking the seismically defined SAF to the NE, that widens into the lower crust and appears to be connected to a broad conductivity anomaly in the upper mantle. Hypothesis tests of the inversion model suggest that upper and lower crustal and upper-mantle anomalies may be interconnected.We speculate that the high conductivities are caused by fluids and may represent a deep-rooted channel for crustal and/or mantle fluid ascent. Based on the chemical analysis of well waters, it was previously suggested that fluids can enter the brittle regime of the SAF system from the lower crust and mantle. At high pressures, these fluids can contribute to fault-weakening at seismogenic depths. These geochemical studies predicted the existence of a deep fluid source and a permeable pathway through the crust. Our resistivity model images a conductive pathway, which penetrates the entire crust, in agreement with the geochemical interpretation. However, the resistivity model also shows that the upper crustal branch of the high-conductivity zone is locatedNEof the seismically defined SAF, suggesting that the SAF does not itself act as a major fluid pathway. This interpretation is supported by both, the location of the upper crustal highconductivity zone and recent studies within the SAFOD main hole, which indicate that pore pressures within the core of the SAF zone are not anomalously high, that mantle-derived fluids are minor constituents to the fault-zone fluid composition and that both the volume of mantle fluids and the fluid pressure increase to the NE of the SAF.We further infer from the MT model that the resistive Salinian block basement to the SW of the SAFOD represents an isolated body, being 5–8 km wide and reaching to depths 〉7 km, in agreement with aeromagnetic data. This body is separated from a massive block of Salinian crust farther to the SW. The NE terminus of resistive Salinian crust has a spatial relationship with a near-vertical zone of increased seismic reflectivity ∼15 km SW of the SAF and likely represents a deep-reaching fault zone.
    Keywords: 550 - Earth sciences
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  • 72
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: English
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  • 73
    Publication Date: 2020-02-12
    Description: The passive margin of the South Atlantic shows typical features of a rifted volcanic continental margin, encompassing seaward dipping reflectors, continental flood basalts and high-velocity/density lower crust at the continent–ocean transition, probably emplaced during initial seafloor spreading in the Early Cretaceous. The Springbok profile offshore western South Africa is a combined transect of reflection and refraction seismic data. This paper addresses the analysis of the seismic velocity structure in combination with gravity modelling and isostatic modelling to unravel the crustal structure of the passive continental margin from different perspectives. The velocity modelling revealed a segmentation of the margin into three distinct parts of continental, transitional and oceanic crust. As observed at many volcanic margins, the lower crust is characterised by a zone of high velocities with up to 7.4 km/s. The conjunction with gravity modelling affirms the existence of this body and at the same time substantiated its high densities, found to be 3100 kg/m3. Both approaches identified the body to have a thickness of about 10 km. Yet, the gravity modelling predicted the transition between the high-density body towards less dense material farther west than initially anticipated from velocity modelling and confirmed this density gradient to be a prerequisite to reproduce the observed gravity signal. Finally, isostatic modelling was applied to predict average crustal densities if the margin was isostatically balanced. The results imply isostatic equilibrium over large parts of the profile, smaller deviations are supposed to be compensated regionally. The calculated load distribution along the profile implies that all pressures are hydrostatic beneath a depth of 45 km.
    Keywords: 550 - Earth sciences
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  • 74
    Publication Date: 2020-02-12
    Description: We propose a new rapid procedure for determining the energy magnitude Me for shallow events from broadband teleseismic P-wave signals within the distance range 20°–98°. To accomplish this task, we compute spectral amplitude decay functions for different periods using numerical simulations based on the reference Earth model AK135Q. By means of these functions, we correct the spectra of the teleseismic recordings for the propagation path effects, and calculate the radiated seismic energy ES, and hence Me. We use cumulative P-wave windows for simulating a real- or near real-time procedure and test it for 61 shallow earthquakes. The results show that our approach is able to provide a rapid and reliable Me determination within 7–15 minutes after the earthquake origin time, and is therefore suitable for implementation in rapid response systems.
    Keywords: 550 - Earth sciences
    Language: English
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  • 75
    Publication Date: 2020-02-12
    Description: Detailed images of the lithosphere beneath the western Bohemian Massif were obtained by analysis of more than 8500 P receiver functions. At the intersection of Regensburg-Leipzig-Rostock zone and Eger Rift, crustal thickness decreases to 26 km from approx. 31 km in the surroundings. The receiver functions display a positive phase at about 6 s delay time and a strong negative phase at 7 to 8 s, which coincides with an area of Moho updoming, CO2 mantle-derived degassing and earthquake swarm activity. These phases can be modeled by a velocity increase at 50 km and a velocity decrease at 65 km depth. The velocity decrease, observed over an area of 5300 km2, gives evidence for local asthenospheric updoming and/or a confined body of partial melt, which might be the cause for high CO2 mantle fluid flow and earthquake swarm activity in this recently nonvolcanic, intracontinental rift area.
    Keywords: 550 - Earth sciences
    Language: English
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  • 76
    Publication Date: 2020-02-12
    Description: Compound-specific isotope analysis has become an important tool in environmental studies and is an especially powerful way to evaluate biodegradation of hydrocarbons. Here, carbon isotope ratios of light hydrocarbons were used to characterise in-reservoir biodegradation in the Gullfaks oil field, offshore Norway. Increasing biodegradation, as characterised, for example, by increasing concentration ratios of Pr/n-C17 and Ph/n-C18, and decreasing concentrations of individual light hydrocarbons were correlated to 13C-enrichment of the light hydrocarbons. The δ13C values of C4 to C9n-alkanes increase by 7–3‰ within the six oil samples from the Brent Group of the Gullfaks oil field, slight changes (1–3‰) being observed for several branched alkanes and benzene, whereas no change (〈1‰) in δ13C occurs for cyclohexane, methylcyclohexane, and toluene. Application of the Rayleigh equation demonstrated high to fair correlation of concentration and isotope data of i- and n-pentane, n-hexane, and n-heptane, documenting that biodegradation in reservoirs can be described by the Rayleigh model. Using the appropriate isotope fractionation factor of n-hexane, derived from laboratory experiments, quantification of the loss of this petroleum constituent due to biodegradation is possible. Toluene, which is known to be highly susceptible to biodegradation, is not degraded within the Gullfaks oil field, implying that the local microbial community exhibits rather pronounced substrate specificities. The evaluation of combined molecular and isotopic data expands our understanding of the anaerobic degradation processes within this oil field and provides insight into the degradative capabilities of the microorganisms. Additionally, isotope analysis of unbiodegraded to slightly biodegraded crude oils from several oil fields surrounding Gullfaks illustrates the heterogeneity in isotopic composition of the light hydrocarbons due to source effects. This indicates that both source and also maturity effects have to be well constrained when using compound-specific isotope analysis for the assessment of biodegradation.
    Keywords: 550 - Earth sciences
    Language: English
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  • 77
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    Unknown
    In:  Geochemistry Geophysics Geosystems (G3)
    Publication Date: 2020-02-12
    Description: In this study we present the new tomographic code ANITA which provides 3-D anisotropic P and isotropic S velocity distribution based on P and S traveltimes from local seismicity. For the P anisotropic model, we determine four parameters for each parameterization cell. This represents an orthorhombic anisotropy with one predefined direction oriented vertically. Three of the parameters describe slowness variations along three horizontal orientations with azimuths of 0°, 60°, and 120°, and one is a perturbation along the vertical axis. The nonlinear iterative inversion procedure is similar to that used in the LOTOS code. We have implemented this algorithm for the updated data set of central Java, part of which was previously used for the isotropic inversion. It was obtained that the crustal and uppermost mantle velocity structure beneath central Java is strongly anisotropic with 7–10% of maximal difference between slow and fast velocity in different directions. In the forearc (area between southern coast and volcanoes), the structure of both isotropic and anisotropic structure is strongly heterogeneous. Variety of anisotropy orientations and highly contrasted velocity patterns can be explained by a complex block structure of the crust. Beneath volcanoes we observe faster velocities in vertical direction, which is probably an indicator for vertically oriented structures (channels, dykes). In the crust beneath the middle part of central Java, north to Merapi and Lawu volcanoes, we observe a large and very intense anomaly with a velocity decrease of up to 30% and 35% for P and S models, respectively. Inside this anomaly E-W orientation of fast velocity takes place, probably caused by regional extension stress regime. In a vertical section we observe faster horizontal velocities inside this anomaly that might be explained by layering of sediments and/or penetration of quasi-horizontal lenses with molten magma. In the mantle, trench parallel anisotropy is observed throughout the study area. Such anisotropy in the slab entrained corner flow may be due to presence of B-type olivine having predominant axis parallel to the shear direction, which appears in conditions of high water or/and melting content.
    Keywords: 550 - Earth sciences
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  • 78
    Publication Date: 2020-02-12
    Description: As part of the South American Geodynamic Activities project we observed the present day deformation field in the territories of Chile and Argentina using the Global Positioning System. The results clearly show that the earthquake cycle dominates the contemporary surface deformation of the central and southern Andes. Compared to geological timescales, the transient elastic deformation related to subduction earthquakes presents a short-term signal which can be explained by interseismic, coseismic, and postseismic phases of interplate thrust earthquakes. We constructed the Andean Elastic Dislocation Model (AEDM) in order to subtract the interseismic loading from the observed velocities. The estimated parameters of the AEDM, and the amount and depth of coupling between the subducting Nazca and overriding South American Plates, represent long-term features and show that the seismogenic interface between both plates is fully locked and that the depth of coupling increases from north to south. The prominent signals in the residual velocity field (i.e. observed velocities minus AEDM) are obviously due to postseismic relaxation processes; they are visible in the area of the 1995 Mw 8.0 Antofagasta earthquake and in the area of the 1960 Mw 9.5 Valdivia earthquake. Although postseismic deformations, compared to geologic timescales, are short-term signals, those signals are valuable constraints on important long-term features of Andean evolution, i.e., the viscosity of the upper mantle and lower crust. The observed surface data are best fitted with a three-dimensional finite element model in which we incorporate a mantle viscosity of 4 × 1019 Pa s. The most obvious long-term deformation signal is manifested in the back-arc of the subduction zone where the Brazilian Shield thrusts beneath the Subandean zone. The style and amount of backarc shortening changes along strike of the orogen, increasing from zero in the south (latitude 〈 −38° S) to values in the order of 10 mm yr−1 close to the Bolivian Orocline. In the fore-arc, whilst we see indications for long-term E-W extension, we did not find any apparent slip partitioning. In addition to this long-term signal, we suggest that the asymmetry of interseismic and coseismic deformation may lead to tectonic structures in the fore-arc. If the coseismic deformation does not release all of the accumulated deformation, then, over many earthquake cycles, part of the interseismic deformation may be transformed into permanent long-term plastic deformation.
    Keywords: 550 - Earth sciences
    Language: English
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  • 79
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    In:  The Andes - Active Subduction Orogeny | Frontiers in Earth Sciences
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: English
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  • 80
    Publication Date: 2020-02-12
    Description: The lithospheric structure of the Aegean region is investigated by analysis of Rayleigh-wave fundamental mode dispersion measurements. Isotropic 1-D models for almost 100 two-station ray paths across the region display distinct variations in the Moho depth and crustal S-wave velocities. The descending slab of the subducting African plate can be resolved down to 120 km depth beneath the volcanic arc. Three different regions are distinguished in terms of Moho depth: (1) The forearc, with large crustal thicknesses between 38 and 48 km and an average of 43 km, (2) the northern Aegean, with an average Moho depth of 28 km and (3) the southern Aegean (central volcanic arc, i.e. Cyclades, and Sea of Crete) with an even thinner crust of around 25 km. Lateral variations in structure between 25 and 55 km depth indicate a marked difference between the western and eastern forearc, collocated with pronounced changes in trench and slab geometry as well as published deformation rates. S velocities between 25 and 55 km depth are low everywhere beneath the forearc but increase from the Peleponnesus to Crete. An abrupt change occurs between western and central Crete in terms of the visibility of the Aegean Moho and the seismic structure of the lithospheric mantle wedge: An Aegean mantle wedge with S velocities above 4.4 km s−1 is only observed to the east of central Crete, whereas to the west velocities of less than 4.0 km s−1 occur down to the plate contact. These low velocities above the slab may indicate the presence of a melange of metamorphic rocks at the depths. A low-velocity asthenospheric layer is observed beneath the Sea of Crete and the Cyclades below 40 km depth, between the thinned lithosphere above and the slab below. The observed radial anisotropy in the northern part of the Aegean is likely to be due to preferred orientation of anisotropic minerals within the lower crust, possibly caused by lateral ductile flow associated with recent lithospheric extension.
    Keywords: 550 - Earth sciences
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  • 81
    Publication Date: 2020-02-12
    Description: The North Anatolian Fault Zone (NAFZ) below the Sea of Marmara forms a “seismic gap” where a major earthquake is expected to occur in the near future. This segment of the fault lies between the 1912 Ganos and 1999 İzmit ruptures and is the only NAFZ segment that has not ruptured since 1766. To monitor the microseismic activity at the main fault branch offshore of Istanbul below the Çınarcık Basin, a permanent seismic array (PIRES) was installed on the two outermost Prince Islands, Yassiada and Sivriada, at a few kilometers distance to the fault. In addition, a temporary network of ocean bottom seismometers was deployed throughout the Çınarcık Basin. Slowness vectors are determined combining waveform cross correlation and P wave polarization. We jointly invert azimuth and traveltime observations for hypocenter determination and apply a bootstrap resampling technique to quantify the location precision. We observe seismicity rates of 20 events per month for M 〈 2.5 along the basin. The spatial distribution of hypocenters suggests that the two major fault branches bounding the depocenter below the Çınarcık Basin merge to one single master fault below ∼17 km depth. On the basis of a cross-correlation technique we group closely spaced earthquakes and determine composite focal mechanisms implementing recordings of surrounding permanent land stations. Fault plane solutions have a predominant right-lateral strike-slip mechanism, indicating that normal faulting along this part of the NAFZ plays a minor role. Toward the west we observe increasing components of thrust faulting. This supports the model of NW trending, dextral strike-slip motion along the northern and main branch of the NAFZ below the eastern Sea of Marmara.
    Keywords: 550 - Earth sciences
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  • 82
    Publication Date: 2020-02-12
    Description: Here we present the results of local source tomographic inversion beneath central Java. The data set was collected by a temporary seismic network. More than 100 stations were operated for almost half a year. About 13,000 P and S arrival times from 292 events were used to obtain three-dimensional (3-D) Vp, Vs, and Vp/Vs models of the crust and the mantle wedge beneath central Java. Source location and determination of the 3-D velocity models were performed simultaneously based on a new iterative tomographic algorithm, LOTOS-06. Final event locations clearly image the shape of the subduction zone beneath central Java. The dipping angle of the slab increases gradually from almost horizontal to about 70°. A double seismic zone is observed in the slab between 80 and 150 km depth. The most striking feature of the resulting P and S models is a pronounced low-velocity anomaly in the crust, just north of the volcanic arc (Merapi-Lawu anomaly (MLA)). An algorithm for estimation of the amplitude value, which is presented in the paper, shows that the difference between the fore arc and MLA velocities at a depth of 10 km reaches 30% and 36% in P and S models, respectively. The value of the Vp/Vs ratio inside the MLA is more than 1.9. This shows a probable high content of fluids and partial melts within the crust. In the upper mantle we observe an inclined low-velocity anomaly which links the cluster of seismicity at 100 km depth with MLA. This anomaly might reflect ascending paths of fluids released from the slab. The reliability of all these patterns was tested thoroughly.
    Keywords: 550 - Earth sciences
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  • 83
    Publication Date: 2020-02-12
    Description: We employ P to S converted waveforms to investigate effects of the hot mantle plume on seismic discontinuities of the crust and upper mantle. We observe the Moho at depths between 13 and 17 km, regionally covered by a strong shallow intracrustal converted phase. Coherent phases on the transverse component indicate either dipping interfaces, 3-D heterogeneities or lower crustal anisotropy. We find anomalies related to discontinuities in the upper mantle down to the transition zone evidently related to the hot mantle plume. Lithospheric thinning is confirmed in greater detail than previously reported by Li et al., and we determine the dimensions of the low-velocity zone within the asthenosphere with greater accuracy. Our study mainly focuses on the temperature-pressure dependent discontinuities of the upper mantle transition zone. Effects of the hot diapir on the depths of mineral phase transitions are verified at both major interfaces at 410 and 660 km. We determine a plume radius of about 200 km at the 660 km discontinuity with a core zone of about 120 km radius. The plume conduit is located southwest of Big Island. A conduit tilted in the northeast direction is required in the upper mantle to explain the observations. The determined positions of deflections of the discontinuities support the hypothesis of decoupled upper and lower mantle convection.
    Keywords: 550 - Earth sciences
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  • 84
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
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  • 85
    Publication Date: 2020-02-12
    Description: Using three different short-period electromagnetic sensors with resonance frequencies of 1 Hz (Mark L4C-3D), 2 Hz (Mark L-22D), and 4.5 Hz (I/O SM-6), coupled with three digital acquisition system, the portable data acquisition system (PDAS) Teledyne Geotech, the refraction technology (REFTEK) 72A, and the Earth Data Logger PR6-24 (EDL), the effect of the seismic instruments on the horizontal-to-vertical spectral ratio (H/V) using seismic noise for frequencies less than 1 Hz has been evaluated. For all possible sensors–acquisition system pairs, the background seismic signal and instrumental self-noise power spectral densities have been calculated and compared. The results obtained when coupling the short-period sensors with different acquisition systems show that the performance of the considered instruments at frequencies 〈1 Hz strongly depends upon the sensor–acquisition system combination and the gain used, with the best performance obtained for sensors with the lowest resonance frequency. For all acquisition systems, it was possible to retrieve correctly the H/V peak down to 0.1–0.2 Hz by using a high gain and a 1-Hz sensor. In contrast, biased H/V spectral ratios were retrieved when low-gain values were considered. Particular care is required when using 4.5-Hz sensors, because they may not even allow the fundamental resonance frequency peak to be reproduced.
    Keywords: 550 - Earth sciences
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  • 86
    Publication Date: 2020-02-12
    Description: Combined P and S receiver functions from seismograms of teleseismic events recorded at 65 temporary and permanent stations in the Aegean region are used to map the geometry of the subducted African and the overriding Aegean plates. We image the Moho of the subducting African plate at depths ranging from 40 km beneath southern Crete and the western Peloponnesus to 160 km beneath the volcanic arc and 220 km beneath northern Greece. However, the dip of the Moho of the subducting African plate is shallower beneath the Peloponnesus than beneath Crete and Rhodes and flattens out beneath the northern Aegean. Observed P-to-S conversions at stations located in the forearc indicate a reversed velocity contrast at the Moho boundary of the Aegean plate, whereas this boundary is observed as a normal velocity contrast by the S-to-P conversions. Our modeling suggests that the presence of a large amount of serpentinite (more than 30%) in the forearc mantle wedge, which generally occurs in the subduction zones, may be the reason for the reverse sign of the P-to-S conversion coefficient. Moho depths for the Aegean plate show that the southern part of the Aegean (crustal thickness of 20–22 km) has been strongly influenced by extension, while the northern Aegean Sea, which at present undergoes the highest crustal deformation, shows a relatively thicker crust (25–28 km). This may imply a recent initiation of the present kinematics in the Aegean. Western Greece (crustal thickness of 32–40 km) is unaffected by the recent extension but underwent crustal thickening during the Hellenides Mountains building event. The depths of the Aegean Moho beneath the margin of the Peloponnesus and Crete (25–28 and 25–33 km, respectively) show that these areas are also likely to be affected by the Aegean extension, even though the Cyclades (crustal thickness of 26–30 km) were not significantly involved in this episode. The Aegean lithosphere-asthenosphere boundary (LAB) mapped with S receiver functions is about 150 km deep beneath mainland Greece, whereas the LAB of the subducted African plate dips from 100 km beneath Crete and the southern Aegean Sea to about 225 km under the volcanic arc. This implies a thickness of 60–65 km for the subducted African lithosphere, suggesting that the Aegean lithosphere was not significantly affected by the extensional process associated with the exhumation of metamorphic core complexes in the Cyclades.
    Keywords: 550 - Earth sciences
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  • 87
    Publication Date: 2020-02-12
    Description: It has recently been shown that correlations of seismic noise can contain significant information about the Green's function along the station profile. Using an array of 38 temporary broad-band stations located in Finland between 1998 September and 1999 March, we study the resulting 703 noise correlations to understand how they are influenced by the directivity of the noise field. The latter information is obtained through f-k analysis of data from two permanent seismic arrays in Germany and Norway and from a subset of stations of the array in Finland. Both types of analysis confirm that the characteristic of the seismic noise is strongly frequency-dependent. At low frequencies (0.02-0.04 Hz), we observe diffuse noise and/or randomly distributed sources. In contrast, the noise is strongly direction-dependent and not fully diffuse in the intermediate period ranges (0.04-0.25 Hz) which correspond to the first and second micro seismic peak, created at the Irish and Scottish coast and the western coast of Norway In this frequency interval the noise is sufficiently close to a plane wave to introduce systematic errors in group velocities for station pairs which are not parallel to the direction of the dominant incident noise. Phase velocities calculated by slant stack over many traces are however correct, independently of profile direction. In the high-frequency band (0.25-1.0 Hz), the situation is a mix between the low-frequency and the intermediate frequency cases. Average phase velocities and individual group velocities from well-oriented profiles are in excellent agreement with results from Rayleigh wave studies of the area.
    Keywords: 550 - Earth sciences
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  • 88
    Publication Date: 2020-02-12
    Description: This study focuses on the present-day deformation mechanisms of the south central Chile margin, at the transition zone between two megathrust earthquake segments defined from historical data: the Valdivia and Concepción sectors. New GPS data and finite-element models with complex geometries constrained by geophysical data are presented to gain insight into forearc kinematics and to address the role of upper plate faults on contemporary deformation. GPS vectors are heterogeneously distributed in two domains that follow these two earthquake segments. We find that models which simulate only interseismic locking on the plate interface fail to reproduce surface deformation in the entire study area. In the Concepción domain, models that include a crustal-scale fault in the upper plate better reproduce the GPS observations. In the Valdivia domain, GPS data show regional-scale vertical axis rotations, which could reflect postseismic deformation processes at the edge of the Mw 9.5 earthquake that ruptured in 1960 and/or activity of another crustal fault related to motion of a forearc sliver. Our study suggests that upper plate faults in addition to earthquake cycle transients may exert an important control on the surface velocity of subduction zone forearcs.
    Keywords: 550 - Earth sciences
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  • 89
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
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  • 90
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: English
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  • 91
    Publication Date: 2020-02-12
    Description: The volcanic arc of the Hellenic subduction zone with its four volcanic centers is of major relevance when evaluating the seismovolcanic hazard for the Aegean region. We present results from a 22-station temporary seismic network (CYCNET) in the central Hellenic Volcanic Arc (HVA). CYCNET recordings allow to analyze the level and spatio-temporal evolution of microseismic activity in this region for the first time. A total of 2175 events recorded between September 2002 and July 2004 are analyzed using statistical methods, cluster analysis and relative relocation techniques. We identify distinct regions with significantly varying spatio-temporal behavior of microseismicity. A large portion of the seismic activity within the upper crust is associated with the presence of islands representing horst structures that were generated during the major Oligocene extensional phase. In contrast, the central part of the Cyclades metamorphic core complex remains aseismic considering our magnitude threshold of 1.8 except one spot where events occur swarm-like and with highly similar waveforms. The highest activity in the study area was identified along the SW–NE striking Santorini–Amorgos zone. Within this zone the submarine Columbo volcano exhibits strong temporal variations of seismic activity on a high background level. This activity is interpreted to be directly linked to the magma reservoir and therein the migration of magma and fluids towards the surface. NE of Columbo where no volcanic activity has yet been reported we observe a similar seismicity pattern with small-scaled activity spots that might represent local pathways of upward migrating fluids or even developing volcanic activity within this zone of crustal weakness. In contrast, the Santorini and Milos volcanic complexes do not show significant temporal variations and low to moderate background activity, respectively. Relating our results to the distribution of historical earthquakes and the GPS-derived horizontal velocity field we conclude that the Santorini–Amorgos zone is presently in the state of right-lateral transtension reflecting a major structural boundary of the volcanic arc subdividing it into a seismically and volcanically quiet western and an active eastern part.
    Keywords: 550 - Earth sciences
    Language: English
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  • 92
    Publication Date: 2020-02-12
    Description: Seismic anisotropy was investigated by measuring shear-wave splitting at 19 broadband stations in Greenland. We examined mostly SKS and SKKS phases, but also some PKS and depth phases of SKS (e.g. pSKS, sSKS) for deep events. Splitting parameters (fast polarization and time delay) were determined for these phases. The fast polarizations at nine sites in southern Greenland are quite uniformly oriented about N–NE. Two sites in central northern Greenland show a similar geometry to southern Greenland. Similar fast polarizations in southern and central northern Greenland suggest continuity of structural fabric beneath large parts of Greenland. This coherent pattern extends across a number of geological provinces of varying age and suggests a common cause of anisotropy not related to the bitwise formation of the Greenland continental block. Four sites in an east–west oriented belt crossing central Greenland show varying fast polarizations and suggest a separate process causing the anisotropy there, which may indicate that these processes are not currently active. The overall pattern of anisotropy in our results, with the exception of variations across central Greenland, is similar to results obtained from Rayleigh waves. The irregular geometry of splitting across central Greenland may be related to the impact of the Iceland plume at ∼ 60 Ma. Reported splitting time delays range from 0.4 to 1.4 s with an average of 0.8 s, which can generally not be explained by crustal anisotropy alone. If confined to a lithosphere of thickness on the order of 100 km, time delays of up to 1.4 s indicate anisotropy of up to about 6%, assuming that the a crystallographic axis of olivine is preferentially contained in the horizontal plane. We suggest that the anisotropy beneath Greenland is located mainly in the upper mantle but some contributions from the crust and lower mantle may be present.
    Keywords: 550 - Earth sciences
    Language: English
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  • 93
    Publication Date: 2020-02-12
    Description: We report on a receiver function study of the crust and upper mantle within DESERT, a multidisciplinary geophysical project to study the lithosphere across the Dead Sea Transform (DST). A temporary seismic network was operated on both sides of the DST between 2000 April and 2001 June. The depth of the Moho increases smoothly from about 30 to 34-38 km towards the east across the DST, with significant north-south variations east of the DST. These Moho depth estimates from receiver functions are consistent with results from steep- and wide-angle controlled-source techniques. Steep-angle reflections and receiver functions reveal an additional discontinuity in the lower crust, but only east of the DST. This leads to the conclusion that the internal crustal structure east and west of the DST is different. The P to S converted phases from both discontinuities at 410 and 660 km are delayed by 2 s with respect to the IASP91 global reference model. This would indicate that the transition zone is consistent with the global average, but the upper mantle above 410 km is 3-4 per cent slower than the standard earth model.
    Keywords: 550 - Earth sciences
    Language: English
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  • 94
    Publication Date: 2020-02-12
    Description: TOPO-EUROPE addresses the 4-D topographic evolution of the orogens and intra-plate regions of Europe through a multidisciplinary approach linking geology, geophysics, geodesy and geotechnology. TOPO-EUROPE integrates monitoring, imaging, reconstruction and modelling of the interplay between processes controlling continental topography and related natural hazards. Until now, research on neotectonics and related topography development of orogens and intra-plate regions has received little attention. TOPO-EUROPE initiates a number of novel studies on the quantification of rates of vertical motions, related tectonically controlled river evolution and land subsidence in carefully selected natural laboratories in Europe. From orogen through platform to continental margin, these natural laboratories include the Alps/Carpathians–Pannonian Basin System, the West and Central European Platform, the Apennines–Aegean–Anatolian region, the Iberian Peninsula, the Scandinavian Continental Margin, the East-European Platform, and the Caucasus–Levant area. TOPO-EUROPE integrates European research facilities and know-how essential to advance the understanding of the role of topography in Environmental Earth System Dynamics. The principal objective of the network is twofold. Namely, to integrate national research programs into a common European network and, furthermore, to integrate activities among TOPO-EUROPE institutes and participants. Key objectives are to provide an interdisciplinary forum to share knowledge and information in the field of the neotectonic and topographic evolution of Europe, to promote and encourage multidisciplinary research on a truly European scale, to increase mobility of scientists and to train young scientists. This paper provides an overview of the state-of-the-art of continental topography research, and of the challenges to TOPO-EUROPE researchers in the targeted natural laboratories.
    Keywords: 550 - Earth sciences
    Language: English
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  • 95
    Publication Date: 2020-02-12
    Description: We examine a 24-hour period of active San Andreas Fault (SAF) tremor and show that this tremor is largely composed of repeated similar events. Utilizing this similarity, we locate the subset of the tremor with waveforms similar to an identified low frequency earthquake (LFE) “master template,” located using P and S wave arrivals to be ∼26 km deep. To compensate for low signal-to-noise, we estimate event-pair differential times at “clusters” of nearby stations rather than at single stations. We find that the locations form a near-linear structure in map view, striking parallel to the SAF and near the surface trace. Therefore, we suggest that at least a portion of the tremor occurs on the deep extension of the fault, likely reflecting shear slip, similar to subduction zone tremor. If so, the SAF may extend to the base of the crust, ∼10 km below the deepest regular earthquakes on the fault.
    Keywords: 550 - Earth sciences
    Language: English
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  • 96
    Publication Date: 2020-02-12
    Description: The Seychelles plateau is a prime example of a microcontinent, yet mechanisms for its creation and evolution are poorly understood. Recently acquired teleseismic data from a deployment of 26 stations on 18 islands in the Seychelles are analyzed to study upper mantle seismic anisotropy using SKS splitting results. Strong microseismic noise is attenuated using a polarization filter. Results show significant variation in time delays (dt =0.4–2.4 s) and smooth variations in orientation (f = 1569 where f is the polarization of the fast shear wave). The splitting results cannot be explained by simple asthenospheric flow associated with absolute plate motions. Recent work has suggested that anisotropy measurements for oceanic islands surrounding Africa can be explained by mantle flow due to plate motion in combination with density-driven flow associated with the African superswell. Such a mechanism explains our results only if there are lateral variations in the viscosity of the mantle. It has been suggested that the Seychelles are underlain by a mantle plume. Predictions of flow-induced anisotropy from plumelithosphere interaction can explain our results with a plume possibly impinging beneath the plateau. Finally, we consider lithospheric anisotropy associated with rifting processes that formed the Seychelles. The large variation in the magnitude of shear wave splitting over short distances suggests a shallow source of anisotropy. Fast directions align parallel to an area of transform faulting in the Amirantes. Farther from this area the orientation of anisotropy aligns in similar directions as plate motions. This supports suggestions of transpressive deformation during the opening of the Mascarene basin.
    Keywords: 550 - Earth sciences
    Language: English
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  • 97
    Publication Date: 2020-02-12
    Description: A detailed knowledge of the thickness of the lithosphere in the north Atlantic is an important parameter for understanding plate tectonics in that region. We achieve this goal with as yet unprecedented detail using the seismic technique of S-receiver functions. Clear positive signals from the crust-mantle boundary and negative signals from a mantle discontinuity beneath Greenland, Iceland and Jan Mayen are observed. According to seismological practice, we call the negative phase the lithosphere-ashenosphere boundary (LAB). The seismic lithosphere under most of the Iceland and large parts of central Greenland is about 80 km thick. This depth in Iceland is in disagreement with estimates of the thickness of the elastic lithosphere (10-20 km) found from postglacial rebound data. In the region of flood basalts in eastern Greenland, which overlies the proposed Iceland plume track, the lithosphere is only 70 km thick, about 10 km less than in Iceland which is located directly above the proposed plume. At the western Greenland coast, the lithosphere.
    Keywords: 550 - Earth sciences
    Language: English
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  • 98
    Publication Date: 2020-02-12
    Description: We describe results of an active-source seismology experiment across the Chilean subduction zone at 38.2◦S. The seismic sections clearly show the subducted Nazca plate with varying reflectivity. Below the coast the plate interface occurs at 25 km depth as the sharp lower boundary of a 2–5 km thick, highly reflective region, which we interpret as the subduction channel, that is, a zone of subducted material with a velocity gradient with respect to the upper and lower plate. Further downdip along the seismogenic coupling zone the reflectivity decreases in the area of the presumed 1960 Valdivia hypocentre. The plate interface itself can be traced further down to depths of 50–60 km below the Central Valley. We observe strong reflectivity at the plate interface as well as in the continental mantle wedge. The sections also show a segmented forearc crust in the overriding South American plate. Major features in the accretionary wedge, such as the Lanalhue fault zone, can be identified. At the eastern end of the profile a bright west-dipping reflector lies perpendicular to the plate interface and may be linked to the volcanic arc.
    Keywords: 550 - Earth sciences
    Language: English
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  • 99
    Publication Date: 2020-02-12
    Description: Following the ongoing debate about suitability of short-period sensor for seismic noise measurements at frequencies lower than 1 Hz, in this study we compare recordings from two different seismometers (Güralp CMG-3ESPC and Mark L4C-3D) installed side by side in the GeoForschungsZentrum laboratory. The comparison carried out in terms of Power Spectral Density and coherency analysis shows an excellent agreement between the short-period and the broad-band recordings in the frequency band 0.2–20 Hz. Therefore, this result highlights that with a calibrated short-period sensor one can obtain the same results that would be obtained by using a broad-band seismometer in the band of engineering interest.
    Keywords: 550 - Earth sciences
    Language: English
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  • 100
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: English
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