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  • 1
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    Integrated Fault Seal Analysis (2020)
    London : The Geological Society
    Details
    Keywords: fault ; fault seal ; fluid flow ; petroleum ; exploration
    Description / Table of Contents: Integrated Fault Seal Analysis: An Introduction / Steven R. Ogilvie, Steve J. Dee, Robert W. Wilson and Wayne R. Bailey / Geological Society, London, Special Publications, 496, 1-8, 7 May 2020, https://doi.org/10.1144/SP496-2020-51 --- Fault seal behaviour in Permian Rotliegend reservoir sequences: case studies from the Dutch Southern North Sea / K. van Ojik, A. Silvius, Y. Kremer and Z. K. Shipton / Geological Society, London, Special Publications, 496, 9-38, 13 November 2019, https://doi.org/10.1144/SP496-2018-189 --- An experimental and numerical investigation on the hydromechanical behaviour of carbonate fault zones upon reactivation: the impact of carbonate mud sealing layers and overall research outcomes / M. Nogueira Kiewiet, C. Lima, A. Giwelli, C. Delle Piane, V. Lemiale, L. Esteban, F. Falcao, M. B. Clennell, J. Dautriat, L. Kiewiet, J. Raimon, S. Kager and D. Dewhurst / Geological Society, London, Special Publications, 496, 39-73, 8 November 2019, https://doi.org/10.1144/SP496-2018-153 --- Fault failure modes, deformation mechanisms, dilation tendency, slip tendency, and conduits v. seals / David A. Ferrill, Kevin J. Smart and Alan P. Morris / Geological Society, London, Special Publications, 496, 75-98, 16 December 2019, https://doi.org/10.1144/SP496-2019-7 --- Fault zone architecture and its scaling laws: where does the damage zone start and stop? / A. Torabi, T. S. S. Ellingsen, M. U. Johannessen, B. Alaei, A. Rotevatn and D. Chiarella / Geological Society, London, Special Publications, 496, 99-124, 11 October 2019, https://doi.org/10.1144/SP496-2018-151 --- Fault fictions: systematic biases in the conceptualization of fault-zone architecture / Z. K. Shipton, J. J. Roberts, E. L. Comrie, Y. Kremer, R. J. Lunn and J. S. Caine / Geological Society, London, Special Publications, 496, 125-143, 16 December 2019, https://doi.org/10.1144/SP496-2018-161 --- Validation and analysis procedures for juxtaposition and membrane fault seals in oil and gas exploration / Titus A. Murray, William L. Power, Anthony J. Johnson, Greg J. Christie and David R. Richards / Geological Society, London, Special Publications, 496, 145-161, 11 November 2019, https://doi.org/10.1144/SP496-2018-171 --- Stochastic modelling of fault gouge zones: implications for fault seal analysis / Neil T. Grant / Geological Society, London, Special Publications, 496, 163-197, 24 October 2019, https://doi.org/10.1144/SP496-2018-135 --- Efficient handling of fault properties using the Juxtaposition Table Method / Tor Anders Knai and Guillaume Lescoffit / Geological Society, London, Special Publications, 496, 199-207, 23 March 2020, https://doi.org/10.1144/SP496-2018-192 --- A knowledge database of hanging-wall traps that are dependent on fault-rock seal / Peter G. Bretan, Graham Yielding and Einar Sverdrup / Geological Society, London, Special Publications, 496, 209-222, 27 September 2019, https://doi.org/10.1144/SP496-2018-157 --- Subsurface observations of deformation bands and their impact on hydrocarbon production within the Holstein Field, Gulf of Mexico, USA / Scott J. Wilkins, Russell K. Davies and Steve J. Naruk / Geological Society, London, Special Publications, 496, 223-252, 11 October 2019, https://doi.org/10.1144/SP496-2018-139 --- Enhancing trap and fault seal analyses by integrating observations from HR3D seismic data with well logs and conventional 3D seismic data, Texas inner shelf / Johnathon L. Osmond and Timothy A. Meckel / Geological Society, London, Special Publications, 496, 253-279, 19 December 2019, https://doi.org/10.1144/SP496-201
    Pages: Online-Ressource (288 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781786204592
    URL: https://sp.lyellcollection.org/content/496/1
    Language: English
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  • 2
    Monograph available for loan
    Monograph available for loan
    The changing role of Geological Surveys (2020)
    London : The Geological Society
    Associated volumes
    Details
    Call number: 9/M 07.0421(499)
    In: Geological Society special publication : 499
    Type of Medium: Monograph available for loan
    Pages: 305 Seiten , Illustrationen
    ISBN: 978-1-78620-476-9
    Series Statement: Geological Society special publication no. 499
    URL: Lizenzpflichtig
    Language: English
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  • 3
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    The changing role of Geological Surveys (2020)
    London : The Geological Society
    Associated volumes
    Details
    Call number: https://doi.org/10.1144/SP499
    In: Geological Society special publication
    Description / Table of Contents: Senior managers and Heads of Geological Survey Organizations (GSOs) from around the world have contributed a collection of papers to provide a benchmark on how GSOs are responding to national and international needs in a rapidly changing world. GSOs continue to provide key scientific information about Earth systems, natural hazards and climate change. As countries adopt sustainable development principles and the public increasingly turns to social media to find information about resource and environmental issues, the generation and communication of Earth science knowledge become increasingly important. This volume provides a snapshot of how GSOs are adapting their activities to this changing world. The different national perspectives presented converge around several common themes related to resources, environment and big data. Climate change and the UN's Sustainable Development Goals provide an increased incentive for GSOs of the world to work in harmony, to generate knowledge of Earth systems and to provide solutions for sustainable management of the planet.
    Type of Medium: 12
    Pages: 1 Online-Ressource (305 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781786204769 (print)
    Series Statement: Geological Society special publication 499
    URL: https://sp.lyellcollection.org/content/499/1
    URL: Cover
    Language: English
    Note: The changing role of Geological Surveys: introduction / Philip R. Hill, Daniel Lebel, Murray Hitzman, Morten Smelror and Harvey Thorleifson / Geological Society, London, Special Publications, 499, 1-15, 14 September 2020, https://doi.org/10.1144/SP499-2020-19 --- Geology for society in 2058: some down-to-earth perspectives / Morten Smelror / Geological Society, London, Special Publications, 499, 17-47, 10 March 2020, https://doi.org/10.1144/SP499-2019-40 --- Geological Survey of Canada 8.0: mapping the journey towards predictive geoscience / Daniel Lebel / Geological Society, London, Special Publications, 499, 49-68, 16 January 2020, https://doi.org/10.1144/SP499-2019-79 --- Where is geoscience going? / John Ludden / Geological Society, London, Special Publications, 499, 69-77, 23 July 2020, https://doi.org/10.1144/SP499-2019-212 --- Challenges for geological surveys deriving from global megatrends: The Federal Institute for Geosciences and Natural Resources of Germany's perspective and answers / Ralph Watzel / Geological Society, London, Special Publications, 499, 79-83, 13 December 2019, https://doi.org/10.1144/SP499-2019-41 --- The changing role of geological surveys in Malaysia / Shahar Effendi Abdullah Azizi, Nan-Ley Ling, Say-Gee Sia and Brendawati Ismail / Geological Society, London, Special Publications, 499, 85-97, 16 December 2019, https://doi.org/10.1144/SP499-2019-55 --- Seabed mapping in Norwegian waters: programmes, technologies and future advances / Terje Thorsnes, Ole Arve Misund and Morten Smelror / Geological Society, London, Special Publications, 499, 99-118, 10 March 2020, https://doi.org/10.1144/SP499-2019-69 --- Relevant and flexible geosurveys: how Geological Survey Ireland is adapting / Koen Verbruggen, Aoife K. Braiden, Monica Lee, Ray Scanlon, Sean Cullen and Sean Finlay / Geological Society, London, Special Publications, 499, 119-128, 27 April 2020, https://doi.org/10.1144/SP499-2019-150 --- EuroGeoSurveys: from a non-profit association to a geological service for Europe / J. Vidovic, Y. Schavemaker, T. Witteman, J. Tulstrup, S. van Gessel, K. Piessens and S. Solar / Geological Society, London, Special Publications, 499, 129-137, 7 January 2020, https://doi.org/10.1144/SP499-2019-47 --- The fundamental and pioneering role of the Geological Survey in China's social development / Guangsheng Yan, Liangjun Lin, Shoumai Ren and Yu Situ / Geological Society, London, Special Publications, 499, 139-142, 2 September 2020, https://doi.org/10.1144/SP499-2019-204 --- How to demonstrate the role of geology in a modern society: the case of Lithuania, where geology is not visible / Jonas Satkūnas / Geological Society, London, Special Publications, 499, 143-147, 13 December 2019, https://doi.org/10.1144/SP499-2019-57 --- The Geological Survey of Finland strengthening its role as a key player in mineral raw materials innovation ecosystems / Pekka A. Nurmi / Geological Society, London, Special Publications, 499, 149-163, 6 February 2020, https://doi.org/10.1144/SP499-2019-83 --- The Geological Survey of Denmark and Greenland (GEUS): from classical geological services to long-term environmental monitoring programmes, energy transformation and advice on political sensitive topics / Flemming G. Christiansen and Flemming Larsen / Geological Society, London, Special Publications, 499, 165-172, 7 January 2020, https://doi.org/10.1144/SP499-2019-118 --- How the Geological Survey of Sweden contributes digital data for sustainable development / Lena Söderberg, Lars-Kristian Stölen, Jakob Levén, Lovisa Zillén Snowball and Helge Reginiussen / Geological Society, London, Special Publications, 499, 173-182, 7 January 2020, https://doi.org/10.1144/SP499-2019-43 --- Changing roles of State Geological Surveys in the USA: experiences from Illinois / Andrew J. Stumpf, Richard C. Berg and B. Brandon Curry / Geological Society, London, Special Publications, 499, 183-201, 31 January 2020, https://doi.org/10.1144/SP499-2019-128 --- The modern geological survey: a model for research, innovation, synthesis. A USGS perspective / Suzette Kimball, M. Goldhaber, J. Baron and V. Labson / Geological Society, London, Special Publications, 499, 203-211, 30 April 2020, https://doi.org/10.1144/SP499-2019-250 --- Geological surveys as research-focused organizations: New Zealand's experience and opportunities / Mark Rattenbury, Gill Jolly, Peter Benfell and Robert Smillie / Geological Society, London, Special Publications, 499, 213-223, 7 January 2020, https://doi.org/10.1144/SP499-2019-63 --- A new international initiative for facilitating data-driven Earth science transformation / Qiuming Cheng, Roland Oberhänsli and Molei Zhao / Geological Society, London, Special Publications, 499, 225-240, 14 May 2020, https://doi.org/10.1144/SP499-2019-158 --- From the Geological Committee of Russia to the Russian Geological Research Institute: solving problems of state geological mapping / Oleg V. Petrov / Geological Society, London, Special Publications, 499, 241-256, 10 March 2020, https://doi.org/10.1144/SP499-2019-123 --- The UNESCO–IUGS International Geoscience Programme (IGCP) in the service of society since 1972 / K. Heirman and O. Adiyaman Lopes / Geological Society, London, Special Publications, 499, 257-265, 13 December 2019, https://doi.org/10.1144/SP499-2019-73 --- Building the future of the geoscience community in Asia: CCOP beyond history and borders / Young Joo Lee, Dhiti Tulyatid, Marivic Uzarraga, Jisoo Kwak and Juhee Seo / Geological Society, London, Special Publications, 499, 261-281, 30 June 2020, https://doi.org/10.1144/SP499-2019-215 --- Epilogue – The rhymes, musings and riddles of the International Community of Geological Surveys (ICOGS) / Daniel Lebel and Philip R. Hill / Geological Society, London, Special Publications, 499, 283-294, 14 September 2020, https://doi.org/10.1144/SP499-2
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  • 4
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    The Changing Role of Geological Surveys (2020)
    London : The Geological Society
    Details
    Keywords: geological surveys
    Description / Table of Contents: The changing role of Geological Surveys: introduction / Philip R. Hill, Daniel Lebel, Murray Hitzman, Morten Smelror and Harvey Thorleifson / Geological Society, London, Special Publications, 499, 1-15, 14 September 2020, https://doi.org/10.1144/SP499-2020-19 --- Geology for society in 2058: some down-to-earth perspectives / Morten Smelror / Geological Society, London, Special Publications, 499, 17-47, 10 March 2020, https://doi.org/10.1144/SP499-2019-40 --- Geological Survey of Canada 8.0: mapping the journey towards predictive geoscience / Daniel Lebel / Geological Society, London, Special Publications, 499, 49-68, 16 January 2020, https://doi.org/10.1144/SP499-2019-79 --- Where is geoscience going? / John Ludden / Geological Society, London, Special Publications, 499, 69-77, 23 July 2020, https://doi.org/10.1144/SP499-2019-212 --- Challenges for geological surveys deriving from global megatrends: The Federal Institute for Geosciences and Natural Resources of Germany's perspective and answers / Ralph Watzel / Geological Society, London, Special Publications, 499, 79-83, 13 December 2019, https://doi.org/10.1144/SP499-2019-41 --- The changing role of geological surveys in Malaysia / Shahar Effendi Abdullah Azizi, Nan-Ley Ling, Say-Gee Sia and Brendawati Ismail / Geological Society, London, Special Publications, 499, 85-97, 16 December 2019, https://doi.org/10.1144/SP499-2019-55 --- Seabed mapping in Norwegian waters: programmes, technologies and future advances / Terje Thorsnes, Ole Arve Misund and Morten Smelror / Geological Society, London, Special Publications, 499, 99-118, 10 March 2020, https://doi.org/10.1144/SP499-2019-69 --- Relevant and flexible geosurveys: how Geological Survey Ireland is adapting / Koen Verbruggen, Aoife K. Braiden, Monica Lee, Ray Scanlon, Sean Cullen and Sean Finlay / Geological Society, London, Special Publications, 499, 119-128, 27 April 2020, https://doi.org/10.1144/SP499-2019-150 --- EuroGeoSurveys: from a non-profit association to a geological service for Europe / J. Vidovic, Y. Schavemaker, T. Witteman, J. Tulstrup, S. van Gessel, K. Piessens and S. Solar / Geological Society, London, Special Publications, 499, 129-137, 7 January 2020, https://doi.org/10.1144/SP499-2019-47 --- The fundamental and pioneering role of the Geological Survey in China's social development / Guangsheng Yan, Liangjun Lin, Shoumai Ren and Yu Situ / Geological Society, London, Special Publications, 499, 139-142, 2 September 2020, https://doi.org/10.1144/SP499-2019-204 --- How to demonstrate the role of geology in a modern society: the case of Lithuania, where geology is not visible / Jonas Satkūnas / Geological Society, London, Special Publications, 499, 143-147, 13 December 2019, https://doi.org/10.1144/SP499-2019-57 --- The Geological Survey of Finland strengthening its role as a key player in mineral raw materials innovation ecosystems / Pekka A. Nurmi / Geological Society, London, Special Publications, 499, 149-163, 6 February 2020, https://doi.org/10.1144/SP499-2019-83 --- The Geological Survey of Denmark and Greenland (GEUS): from classical geological services to long-term environmental monitoring programmes, energy transformation and advice on political sensitive topics / Flemming G. Christiansen and Flemming Larsen / Geological Society, London, Special Publications, 499, 165-172, 7 January 2020, https://doi.org/10.1144/SP499-2019-118 --- How the Geological Survey of Sweden contributes digital data for sustainable development / Lena Söderberg, Lars-Kristian Stölen, Jakob Levén, Lovisa Zillén Snowball and Helge Reginiussen / Geological Society, London, Special Publications, 499, 173-182, 7 January 2020, https://doi.org/10.1144/SP499-2019-43 --- Changing roles of State Geological Surveys in the USA: experiences from Illinois / Andrew J. Stumpf, Richard C. Berg and B. Brandon Curry / Geological Society, London, Special Publications, 499, 183-201, 31 January 2020, https://doi.org/10.1144/SP499-2019-128 --- The modern geological survey: a model for research, innovation, synthesis. A USGS perspective / Suzette Kimball, M. Goldhaber, J. Baron and V. Labson / Geological Society, London, Special Publications, 499, 203-211, 30 April 2020, https://doi.org/10.1144/SP499-2019-250 --- Geological surveys as research-focused organizations: New Zealand's experience and opportunities / Mark Rattenbury, Gill Jolly, Peter Benfell and Robert Smillie / Geological Society, London, Special Publications, 499, 213-223, 7 January 2020, https://doi.org/10.1144/SP499-2019-63 --- A new international initiative for facilitating data-driven Earth science transformation / Qiuming Cheng, Roland Oberhänsli and Molei Zhao / Geological Society, London, Special Publications, 499, 225-240, 14 May 2020, https://doi.org/10.1144/SP499-2019-158 --- From the Geological Committee of Russia to the Russian Geological Research Institute: solving problems of state geological mapping / Oleg V. Petrov / Geological Society, London, Special Publications, 499, 241-256, 10 March 2020, https://doi.org/10.1144/SP499-2019-123 --- The UNESCO–IUGS International Geoscience Programme (IGCP) in the service of society since 1972 / K. Heirman and O. Adiyaman Lopes / Geological Society, London, Special Publications, 499, 257-265, 13 December 2019, https://doi.org/10.1144/SP499-2019-73 --- Building the future of the geoscience community in Asia: CCOP beyond history and borders / Young Joo Lee, Dhiti Tulyatid, Marivic Uzarraga, Jisoo Kwak and Juhee Seo / Geological Society, London, Special Publications, 499, 261-281, 30 June 2020, https://doi.org/10.1144/SP499-2019-215 --- Epilogue – The rhymes, musings and riddles of the International Community of Geological Surveys (ICOGS) / Daniel Lebel and Philip R. Hill / Geological Society, London, Special Publications, 499, 283-294, 14 September 2020, https://doi.org/10.1144/SP499-2
    Pages: Online-Ressource (305 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781786204769
    URL: https://sp.lyellcollection.org/content/499/1
    Language: English
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  • 5
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    Passive Margins: Tectonics, Sedimentation and Magmatism (2020)
    London : The Geological Society
    Details
    Keywords: passive margins; Atlantic margins; Brazilian margin; Cote de Ivoire margin; Red Sea margin; Mediterranean margin; Gulf of Mexico margin; Shelf margin of Australia
    Description / Table of Contents: Introduction / Ken McClay and James Hammerstein / Geological Society, London, Special Publications, 476, 1-9, 26 March 2020, https://doi.org/10.1144/SP476-2019-246 --- Professor David Gwyn Roberts – a Life in Geoscience / Keith D. Gerdes / Geological Society, London, Special Publications, 476, 11-21, 1 March 2018, https://doi.org/10.1144/SP476.7 --- Reappraisal of the magma-rich versus magma-poor rifted margin archetypes / Julie Tugend, Morgane Gillard, Gianreto Manatschal, Michael Nirrengarten, Caroline Harkin, Marie-Eva Epin, Daniel Sauter, Julia Autin, Nick Kusznir and Ken McDermott / Geological Society, London, Special Publications, 476, 23-47, 2 May 2018, https://doi.org/10.1144/SP476.9 --- Extensional fault-related folding in the northwestern Red Sea, Egypt: segmented fault growth, fault linkages, corner folds and basin evolution / Samir M. Khalil and Ken R. McClay / Geological Society, London, Special Publications, 476, 49-81, 1 January 2018, https://doi.org/10.1144/SP476.12 --- Crustal structure of the conjugate Equatorial Atlantic Margins, derived by gravity anomaly inversion / Nick J. Kusznir, Alan M. Roberts and Andrew D. Alvey / Geological Society, London, Special Publications, 476, 83-107, 19 March 2018, https://doi.org/10.1144/SP476.5 --- Insights into the Early Evolution of the Côte d'Ivoire Margin (West Africa) / Nicola Scarselli, Gregor Duval, Javier Martin, Ken McClay and Steve Toothill / Geological Society, London, Special Publications, 476, 109-133, 16 March 2018, https://doi.org/10.1144/SP476.8 --- Estimating palaeobathymetry with quantified uncertainties: a workflow illustrated with South Atlantic data / L. Pérez-Díaz and G. Eagles / Geological Society, London, Special Publications, 476, 135-162, 1 March 2018, https://doi.org/10.1144/SP476.1 --- Crustal structure of the central sector of the NE Brazilian equatorial margin / Javier Tamara, Ken R. McClay and Neil Hodgson / Geological Society, London, Special Publications, 476, 163-191, 4 March 2020, https://doi.org/10.1144/SP476-2019-54 --- ‘Ductile v. Brittle’ – Alternative structural interpretations for the Niger Delta / Pedro A Restrepo-Pace / Geological Society, London, Special Publications, 476, 193-204, 7 March 2018, https://doi.org/10.1144/SP476.2 --- Orthorhombic faulting in the Beagle Sub-basin, North West Shelf, Australia / K. D. McCormack and K. R. McClay / Geological Society, London, Special Publications, 476, 205-230, 23 March 2018, https://doi.org/10.1144/SP476.3 --- Fault-scarp degradation in the central Exmouth Plateau, North West Shelf, Australia / Awad Bilal, Ken McClay and Nicola Scarselli / Geological Society, London, Special Publications, 476, 231-257, 5 July 2018, https://doi.org/10.1144/SP476.11 --- Tectono-stratigraphy of the Dampier Sub-basin, North West Shelf of Australia / Hongdan Deng and Ken McClay / Geological Society, London, Special Publications, 476, 259-285, 25 July 2019, https://doi.org/10.1144/SP476-2018-180 --- The impact of base-salt relief on salt flow and suprasalt deformation patterns at the autochthonous, paraautochthonous and allochthonous level: insights from physical models / Tim P. Dooley, Michael R. Hudec, Leonardo M. Pichel and Martin P. A. Jackson / Geological Society, London, Special Publications, 476, 287-315, 1 January 2018, https://doi.org/10.1144/SP476.13 --- Role of outer marginal collapse on salt deposition in the eastern Gulf of Mexico, Campos and Santos basins / James Pindell, Rod Graham and Brian W. Horn / Geological Society, London, Special Publications, 476, 317-331, 6 March 2018, https://doi.org/10.1144/SP476.4 --- The South Atlantic and Gulf of Mexico salt basins: crustal thinning, subsidence and accommodation for salt and presalt strata / Mark G. Rowan / Geological Society, London, Special Publications, 476, 333-363, 17 April 2018, https://doi.org/10.1144/SP476.6 --- Tectono-stratigraphic evolution of the SE Mediterranean passive margin, offshore Egypt and Libya / Lydia J. Jagger, Tim G. Bevan and Ken R. McClay / Geological Society, London, Special Publications, 476, 365-401, 12 June 2018, https://doi.org/10.1144/SP476.10 --- Contourites along the Iberian continental margins: conceptual and economic implications / Estefanía Llave, F. Javier Hernández-Molina, Marga García, Gemma Ercilla, Cristina Roque, Carmen Juan, Anxo Mena, Benedict Preu, David Van Rooij, Michele Rebesco, Rachel Brackenridge, Gloria Jané, María Gómez-Ballesteros and Dorrik Stow / Geological Society, London, Special Publications, 476, 403-436, 3 December 2019, https://doi.org/10.1144/SP476-20
    Pages: Online-Ressource (VI, 447 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781786203854
    URL: https://sp.lyellcollection.org/content/476/1
    Language: English
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  • 6
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    A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes (2020)
    Elsevier
    Details
    Publication Date: 2020-07-01
    Print ISSN: 0168-9002
    Electronic ISSN: 1872-9576
    Topics: Physics
    Published by Elsevier
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  • 7
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    Final design and on-sky testing of the iLocater SX acquisition camera: broad-band single-mode fibre coupling (2020)
    Oxford University Press
    Details
    Publication Date: 2020-10-30
    Description: Enabling efficient injection of light into single-mode fibres (SMFs) is a key requirement in realizing diffraction-limited astronomical spectroscopy on ground-based telescopes. SMF-fed spectrographs, facilitated by the use of adaptive optics (AO), offer distinct advantages over comparable seeing-limited designs, including higher spectral resolution within a compact and stable instrument volume, and a telescope independent spectrograph design. iLocater is an extremely precise radial velocity (EPRV) spectrograph being built for the Large Binocular Telescope (LBT). We have designed and built the front-end fibre injection system, or acquisition camera, for the SX (left) primary mirror of the LBT. The instrument was installed in 2019 and underwent on-sky commissioning and performance assessment. In this paper, we present the instrument requirements, acquisition camera design, as well as results from first-light measurements. Broad-band SMF coupling in excess of 35 per cent (absolute) in the near-infrared (0.97–1.31 ${mu { m m}}$) was achieved across a range of target magnitudes, spectral types, and observing conditions. Successful demonstration of on-sky performance represents both a major milestone in the development of iLocater and in making efficient ground-based SMF-fed astronomical instruments a reality.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press on behalf of The Royal Astronomical Society.
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    An international code comparison study on coupled thermal, hydrologic and geomechanical processes of natural gas hydrate-bearing sediments (2020)
    Elsevier
    Details
    Publication Date: 2023-02-08
    Description: Highlights • Code comparisons build confidence in simulators to model interdependent processes. • International hydrate reservoir simulators are compared over five complex problems. • Geomechanical processes significantly impact response of gas hydrate reservoirs. • Simulators yielded comparable results, however many differences are noted. • Equivalent constitutive models are required to achieve agreement across simulators. Geologic reservoirs containing gas hydrate occur beneath permafrost environments and within marine continental slope sediments, representing a potentially vast natural gas source. Numerical simulators provide scientists and engineers with tools for understanding how production efficiency depends on the numerous, interdependent (coupled) processes associated with potential production strategies for these gas hydrate reservoirs. Confidence in the modeling and forecasting abilities of these gas hydrate reservoir simulators (GHRSs) grows with successful comparisons against laboratory and field test results, but such results are rare, particularly in natural settings. The hydrate community recognized another approach to building confidence in the GHRS: comparing simulation results between independently developed and executed computer codes on structured problems specifically tailored to the interdependent processes relevant for gas hydrate-bearing systems. The United States Department of Energy, National Energy Technology Laboratory, (DOE/NETL), sponsored the first international gas hydrate code comparison study, IGHCCS1, in the early 2000s. IGHCCS1 focused on coupled thermal and hydrologic processes associated with producing gas hydrates from geologic reservoirs via depressurization and thermal stimulation. Subsequently, GHRSs have advanced to model more complex production technologies and incorporate geomechanical processes into the existing framework of coupled thermal and hydrologic modeling. This paper contributes to the validation of these recent GHRS developments by providing results from a second GHRS code comparison study, IGHCCS2, also sponsored by DOE/NETL. IGHCCS2 includes participants from an international collection of universities, research institutes, industry, national laboratories, and national geologic surveys. Study participants developed a series of five benchmark problems principally involving gas hydrate processes with geomechanical components. The five problems range from simple geometries with analytical solutions to a representation of the world's first offshore production test of methane hydrates, which was conducted with the depressurization method off the coast of Japan. To identify strengths and limitations in the various GHRSs, study participants submitted solutions for the benchmark problems and discussed differing results via teleconferences. The GHRSs evolved over the course of IGHCCS2 as researchers modified their simulators to reflect new insights, lessons learned, and suggested performance enhancements. The five benchmark problems, final sample solutions, and lessons learned that are presented here document the study outcomes and serve as a reference guide for developing and testing gas hydrate reservoir simulators.
    Type: Article , PeerReviewed
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    The structure of Mediterranean arcs: New insights from the Calabrian Arc subduction system (2020)
    Elsevier
    Details
    Publication Date: 2023-02-08
    Description: Highlights • We present the first modern amphibious seismic experiment conducted across Calabria. • The section shows the forearc-to-backarc Vp structure of the subduction system. • We infer mantle exhumation in the Marsili backarc basin, in the Tyrrhenian. • The system is marked by spatially rapid petrological and tectonic changes. • An analog of Tethys subduction systems formed by slab rollback is proposed. Abstract The formation of Cenozoic mountain belts in the Mediterranean realm was preceded by tens of millions of years of subduction, forming volcanic arcs, and frontal contractional systems. In addition, subduction usually involves slab rollback and formation of oceanic backarcs. Although such structure must have influenced the orogeny of Mediterranean mountain belts, no active analog has been mapped with modern crustal-scale seismic methods. Here, we study the entire Calabrian subduction system to map the structure resulting from Tethys lithosphere subduction and slab rollback, in a process that must be akin to that operating during a phase of the formation of the Mediterranean orogenic belts. We present a crustal-scale cross section of the entire Calabrian subduction system obtained from on- and off-shore wide-angle seismic data. The 2D P-wave velocity section shows spatially abrupt (〈5 km of profile distance) structural and petrological transitions from the Ionian sedimentary wedge and Calabrian arc, to the rifted NW Calabrian margin, where the Quaternary Aeolian arc is emplaced. The margin, then, transitions northwards into the Marsili backarc region, where exhumed mantle and localized volcanism occurred during its formation. This complex structure implies rapid temporal and spatial changes between magmatic and amagmatic processes, and between compressional and extensional regimes during the evolution of this subduction system. We find that some terranes involved in the Alpine orogeny share petrological and tectonic similarities with some domains of the Calabrian subduction system. Based on the results of this study we propose the Calabrian Arc system as an analog for the subduction structuration that preceded the formation of Alpine orogenic systems.
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    The timing and causality of ecological shifts on Caribbean reefs (2020)
    Elsevier
    Details
    Publication Date: 2023-02-08
    Description: Caribbean reefs have experienced unprecedented changes in the past four decades. Of great concern is the perceived widespread shift from coral to macroalgal dominance and the question of whether it represents a new, stable equilibrium for coral-reef communities. The primary causes of the shift—grazing pressure (top-down), nutrient loading (bottom-up) or direct coral mortality (side-in)—still remain somewhat controversial in the coral-reef literature. We have attempted to tease out the relative importance of each of these causes. Four insights emerge from our analysis of an early regional dataset of information on the benthic composition of Caribbean reefs spanning the years 1977–2001. First, although three-quarters of reef sites have experienced coral declines concomitant with macroalgal increases, fewer than 10% of the more than 200 sites studied were dominated by macroalgae in 2001, by even the most conservative definition of dominance. Using relative dominance as the threshold, a total of 49 coral-to-macroalgae shifts were detected. This total represents ~ 35% of all sites that were dominated by coral at the start of their monitoring periods. Four shifts (8.2%) occurred because of coral loss with no change in macroalgal cover, 15 (30.6%) occurred because of macroalgal gain without coral loss, and 30 (61.2%) occurred owing to concomitant coral decline and macroalgal increase. Second, the timing of shifts at the regional scale is most consistent with the side-in model of reef degradation, which invokes coral mortality as a precursor to macroalgal takeover, because more shifts occurred after regional coral-mortality events than expected by chance. Third, instantaneous observations taken at the start and end of the time-series for individual sites showed these reefs existed along a continuum of coral and macroalgal cover. The continuous, broadly negative relationship between coral and macroalgal cover suggests that in some cases coral-to-macroalgae phase shifts may be reversed by removing sources of perturbation or restoring critical components such as the herbivorous sea urchin Diadema antillarum to the system. The five instances in which macroalgal dominance was reversed corroborate the conclusion that macroalgal dominance is not a stable, alternative community state as has been commonly assumed. Fourth, the fact that the loss in regional coral cover and concomitant changes to the benthic community are related to punctuated, discrete events with known causes (i.e. coral disease and bleaching), lends credence to the hypothesis that coral reefs of the Caribbean have been under assault from climate-change-related maladies since the 1970s.
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