S008
Deep earthquake observations, mechanism, and related subduction dynamics
Session ID#: 78717
Session Description:
The physical mechanism of deep (including Intermediate-depth and deep-focus) earthquakes remains an outstanding scientific question in geophysics. At depths of 70 km and greater, increasing temperature and pressure should promote ductile deformation and inhibit brittle failure, which contradicts the observation of the existence of deep earthquakes. Studying deep earthquake sources thus provides very unique clues to this outstanding question of what causes deep earthquakes, more specifically, on how deep earthquake nucleates and how earthquake rupture propagates. Investigating deep earthquakes can also help better understand mineralogical, petrological, and geodynamic processes around and within subducted slabs. This session aims at combining seismological observations, geodynamic simulations, mineralogical and petrological experiments to better constrain slab geometry, elastic and anelastic properties and chemical composition within slab, intra-slab stress distribution, the spatial distribution of slab nucleation and rupture relative to the slab properties, and thus the physical mechanism of deep earthquakes.
Index Terms:
3613 Subduction zone processes [MINERALOGY AND PETROLOGY]
7209 Earthquake dynamics [SEISMOLOGY]
7215 Earthquake source observations [SEISMOLOGY]
8170 Subduction zone processes [TECTONOPHYSICS]
Primary Convener: Yu Chen, Los Alamos National Laboratory, Geophysics Group, Los Alamos, NM, United States
Conveners: Min Chen, Michigan State University, Department of Computational Mathematics, Science and Engineering, East Lansing, MI, United States, Eric Burdette, Brown University, Providence, RI, United States and Lingsen Meng, UCLA, Earth, Planetary and Space Science, Los Angeles, CA, United States
Primary Liaison: Yu Chen, Los Alamos National Laboratory, Geophysics Group, Los Alamos, NM, United States
Non-double-couple mechanisms of deep earthquakes and anisotropic rock fabrics of subducting slabs (Invited) (486230)
Yingcai Zheng1, Paige Given2, Hao Hu1 and Jiaxuan Li3, (1)University of Houston, Earth and Atmospherical Sciences Dept, Houston, TX, United States, (2)University of Houston, Department of Earth and Atmospheric Sciences, Houston, TX, United States, (3)University of Houston, Houston, TX, United States
Post-Seismic Deformation from Deep Earthquakes—Insights into Mantle Rheology and Existence of Afterslip (510387)
Sunyoung Park1, Jean-Philippe Avouac2, Zhongwen Zhan2 and Adriano Gualandi3, (1)California Institute of Technology, Seismological Laboratory, Pasadena, MA, United States, (2)California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, (3)NASA Jet Propulsion Laboratory, Pasadena, CA, United States
Locating and Estimating Full Moment Tensors of Acoustic Emission Events in Samples under High Pressures and Temperatures (511394)
Ziyu Li, Saint Louis University Main Campus, Earth & Atmospheric Sciences, Saint Louis, MO, United States, Lupei Zhu, Saint Louis University, Earth and Atmospheric Sciences, Saint Louis, MO, United States, Yanbin Wang, The University of Chicago, Center for Advanced Radiation Sources, Chicago, IL, United States, Timothy Officer, University of Chicago, Chicago, IL, United States and Feng Shi, The University of Chicago, Center for Advanced Radiation Sources, Argonne, IL, United States
Source complexity of the 2018 Mw 8.2 Tonga earthquake and its relationship to the slab geometry (514067)
Yu Chen, Los Alamos National Laboratory, Geophysics Group, Los Alamos, NM, United States, Ailin Zhang, University of California Los Angeles, Dept. of Earth, Planetary, and Space Sciences., Los Angeles, CA, United States, Lingsen Meng, University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States and Lianxing Wen, State University of New York at Stony Brook, Department of Geosciences, Stony Brook, United States
Transformational Faulting in Silicate Olivines at High Pressure and Temperature (Invited) (517834)
Yanbin Wang1, Timothy Officer1, Tony Yu1, Lupei Zhu2, Amanda Dillman3 and David L Kohlstedt3, (1)University of Chicago, Chicago, IL, United States, (2)Saint Louis University, Earth and Atmospheric Sciences, Saint Louis, MO, United States, (3)University of Minnesota Twin Cities, Minneapolis, MN, United States
Stress drop variation of deep-focus earthquakes based on empirical Green’s functions (519975)
Meichen Liu, Ann Arbor, Michigan, United States, Yihe Huang, University of Michigan Ann Arbor, Ann Arbor, MI, United States and Jeroen Ritsema, Univ Michigan, Ann Arbor, MI, United States
Characteristics and origin of deep earthquake clusters beneath Northwest Pacific and Tonga subduction zone (534608)
Juan Li, Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, Gui Hu, University of Chinese Academy of Sciences, Beijing, China and Guangjie Han, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
Comparison of the Aftershock Sequences of Shallow and Intermediate-Depth Earthquakes in Colombia (541457)
Sungwon Cho1, Linda M Warren1, Brandon Bishop1, Lillian Soto-Cordero1, Patricia Pedraza2, German A Prieto3 and Viviana Dionicio2, (1)Saint Louis University Main Campus, Department of Earth and Atmospheric Sciences, Saint Louis, MO, United States, (2)Servicio Geológico Colombiano, Bogotá, Red Sismológica Nacional de Colombia, Bogotá D.C., Colombia, (3)Universidad Nacional de Colombia, Departamento de Geociencias, Bogota, Colombia
Localized Shear and Thermal Softening of Magnesian Carbonates in Downgoing Slabs: A New Model for Intraslab Earthquakes (556198)
Abhishek Prakash1, Caleb W Holyoke III2, Peter B Kelemen3, William M Lamb1, Stephen H Kirby4, Andreas K Kronenberg1 and Paul Raterron5,6, (1)Texas A&M University, Department of Geology and Geophysics, College Station, TX, United States, (2)University of Akron, Department of Geosciences, Akron, OH, United States, (3)Lamont Doherty Earth Observatory, Columbia University, Palisades, NY, United States, (4)USGS Retired, Menlo Park, CA, United States, (5)National Science Foundation, Alexandria, VA, United States, (6)CNRS - Université de Lille - Brown University, UMET, Villeneuve d'Ascq, France
Intermediate depth events within Nazca plate: Insights from recent earthquakes in Northern and Central Chile (560941)
Sergio Ruiz1, Jean-Baptiste Ammirati1, Leoncio Cabrera1, Bertrand Potin1, Felipe Leyton1, Piero Poli2, Eduardo Contreras-Reyes1, Renzo Mancini1 and Raul I Madariaga3, (1)University of Chile, Santiago, Chile, (2)CNRS, Grenoble Cedex 9, France, (3)Ecole Normale Supérieure Paris, Paris, France
Slab Stagnation in Australasia, and Why Convecting Material Becomes Trapped in the Mid Mantle (561470)
Cameron Maurice Brown, Acworth, GA, United States, Lauren Waszek, University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom and Benoit Tauzin, Laboratoire de Sciences de la Terre, Université de Lyon I, CNRS and Ecole Normale Supérieure de Lyon, UMR5570, Villeurbanne, France
Aftershock Productivity of Large Intermediate Depth Earthquakes (566048)
Shanna Chu, Stanford Earth Sciences, Stanford, CA, United States, Gregory C Beroza, Stanford University, Department of Geophysics, Stanford, CA, United States and William L Ellsworth, Stanford University, Stanford, CA, United States
Seismogenesis in the Lower Zone of Double Seismic Zones by Shear Instabilities in Carbonate Domains in Subducting Oceanic Lithosphere (591710)
Stephen H Kirby, USGS Western Regional Offices Menlo Park, Menlo Park, CA, United States; USGS Retired, Menlo Park, CA, United States and Peter B Kelemen, Lamont Doherty Earth Observatory, Columbia University, Palisades, NY, United States
Laboratory Constraints on the Mechanics and Moment Distribution of Deep-Focus Earthquakes (594808)
Julien Gasc1, Julien Fauconnier1, Clémence Daigre1, Arefeh Moarefvand1, Damien Deldicque1, Blandine Gardonio1, Alexandre Schubnel1 and Pamela C Burnley2, (1)Ecole Normale Supérieure Paris, Laboratoire de Géologie, Paris, France, (2)University of Nevada Las Vegas, Geoscience, Las Vegas, NV, United States
