S34B:
Intermediate-Depth and Deep-Focus Earthquakes I

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Session ID#: 17946

Session Description:
Intermediate-depth and deep-focus earthquakes are key features of geodynamics because they contribute approximately to a fifth of the Earth's seismicity. Intermediate and deep earthquakes challenge our understanding of earthquake physics, because they occur under extreme pressure and temperature conditions. The essential mechanical process responsible for their existence remains one of the outstanding unsolved problems of geophysics. Their source properties provide unique clues into deep Earth mineral physics, stress state, and subducted slab dynamics. Understanding these deep events can also help us understand earthquake processes in general. In the last few years, new laboratory experiments, numerical simulations, and studies of recent deep events pushed forward our view of deep earthquakes. The aim of this session is to be interdisciplinary and we welcome contributions about all aspects of deep earthquakes (including shallower events that bear on relevant physics), and encourage further interactions among seismology, mineral and rock physics, and geodynamics.
Primary Convener:  Zhongwen Zhan, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States
Conveners:  Alexandre Schubnel, Ecole Normale Supérieure Paris, Laboratoire de Géologie, Paris, France and Greg Hirth, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States
Chairs:  Alexandre Schubnel, Ecole Normale Supérieure Paris, Laboratoire de Géologie, Paris, France, Greg Hirth, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States and Zhongwen Zhan, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States
OSPA Liaison:  Zhongwen Zhan, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States
Co-Organized with:
Tectonophysics, Mineral and Rock Physics, and Tectonophysics

Cross-Listed:
  • MR - Mineral and Rock Physics
  • T - Tectonophysics

Proposed Co-Organized Session with:
  • MR - Mineral and Rock Physics
  • T - Tectonophysics
Index Terms:

3613 Subduction zone processes [MINERALOGY AND PETROLOGY]
7209 Earthquake dynamics [SEISMOLOGY]
7215 Earthquake source observations [SEISMOLOGY]
8118 Dynamics and mechanics of faulting [TECTONOPHYSICS]

Abstracts Submitted to this Session:

The 30 May 2015 Bonin Deep Earthquake and the 660-km Discontinuity Around its Source Region (Invited) (147248)
Keiko Kuge, Kyoto University, Department of Geophysics, Kyoto, Japan
Gutenberg-Richter law for deep earthquakes revisited: a dual-mechanism hypothesis (181477)
Zhongwen Zhan, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States
Spatial Relationships between Deep-focus Earthquakes and Structural Heterogeneities within the Subducting Slabs of the Western Pacific Subduction Zones (165754)
Min Chen, Rice University, Houston, TX, United States, Eric Kiser, Rice University, Earth Science Department, Houston, TX, United States; University of Arizona, Department of Geosciences, Tucson, United States and Fenglin Niu, University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China
New observation on Seismic anisotropy in subducting slabs inferred by non-double-couple earthquake radiation patterns (175264)
Jiaxuan Li, California Institute of Technology, Seismological Laboratory, Pasadena, United States, Yingcai Zheng, University of Houston, Earth and Atmospherical Sciences Dept, Houston, TX, United States and Leon Thomsen, Delta Geophysics Inc., Houston, United States
A Transformation-Induced Shear Instability Model for Deep Earthquakes Based on Laboratory Nanoseismological and Microstructural Observations (Invited) (120836)
Yanbin Wang1, Lupei Zhu2, Feng Shi3, Alexandre Schubnel4, Nadege Hilairet5, Tony Yu6, Mark L Rivers6, Julien Gasc7, Ziyu Li8 and Fabrice Brunet9, (1)University of Chicago, Center for Advanced Radiation Sources, Chicago, IL, United States, (2)Saint Louis University, Department of Earth, Environmental and Geospatial Science, Saint Louis, United States, (3)China University of Geosciences Wuhan, Wuhan, China, (4)CNRS, Paris Cedex 16, France, (5)University of Lille 1, Villeneuve d'Ascq, France, (6)The University of Chicago, Center for Advanced Radiation Sources, Chicago, United States, (7)University of Chicago, Chicago, IL, United States, (8)Saint Louis University Main Campus, Earth & Atmospheric Sciences, Saint Louis, MO, United States, (9)ISTerre Institute of Earth Sciences, Saint Martin d'Hères, France
Source Analysis of Bucaramanga Nest Intermediate-Depth Earthquakes (160128)
German A Prieto, Massachusetts Institute of Technology, Earth, Atmospheric and Planetary Sciences, Cambridge, MA, United States; Universidad del Rosario, Facultad de Ciencias Naturales y Matemáticas, Bogota, Colombia, Patricia Pedraza, Servicio Geológico Colombiano, Bogotá, Red Sismológica Nacional de Colombia, Bogotá D.C., Colombia, Viviana Dionicio, Servicio Geológico Colombiano, Red Sismológica Nacional de Colombia, Bogotá, Colombia and Alan Levander, Rice University, Earth, Environmental, and Planetary Science, Houston, TX, United States
Constraints on the extent and kinetics of eclogitization processes in the Indian lower crust (137931)
Kristel Chanard, György Hetényi, Lukas P Baumgartner, Aleksandar Licul and Frederic Herman, University of Lausanne, Lausanne, Switzerland
Development of Pore-pressure Transients in Dehydrating Systems (189084)
Dan Faulkner1, Henri Leclere2, John Wheeler1, John D Bedford3 and Elisabetta Mariani2, (1)University of Liverpool, Earth, Ocean and Ecological Sciences, Liverpool, L69, United Kingdom, (2)University of Liverpool, Earth, Ocean and Ecological Sciences, Liverpool, United Kingdom, (3)University of Liverpool, Liverpool, United Kingdom

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