S016
Mechanical State of Subducting Slabs and Physical Mechanisms of Deep Earthquakes: Integrating Seismological Observations, Laboratory Experiments, and Numerical Simulation
Session ID#: 160468
Session Description:
Subduction zones are the most tectonically active regions in Earth and exert a major force driving mantle dynamics. Slabs exhibit complex lithology and vary dramatically in terms of deformation history, thermal structure and volatile content. Deep earthquakes (depth > 70 km), which can be further categorized as intermediate-depth (70-350 km depth) and deep-focus (350-700 km), are a widespread feature of subduction zones. However, their causes and mechanisms remain a major scientific question.
We invite contributions from observational studies, both field and laboratory, that address the properties and physics of deep earthquakes, together with theoretical and numerical modeling of the structure and mechanics of subducting slabs. Novel techniques to image deep slabs and deep earthquakes are especially welcome. Broader issues addressed may include constraints on deep seismogenesis, thermal structure and stress state in subducting slabs, and how to effectively combine the various approaches to better understand the puzzle of deep earthquakes.
Index Terms:
3924 High-pressure behavior [MINERAL PHYSICS]
7208 Mantle [SEISMOLOGY]
8118 Dynamics and mechanics of faulting [TECTONOPHYSICS]
8170 Subduction zone processes [TECTONOPHYSICS]
Primary Convener: Timothy Officer, University of Chicago, Chicago, IL, United States
Conveners: Saeko Kita, National Research Institute for Earth Science, Tsukuba, Japan, Craig Foster, University of Illinois at Chicago, Chicago, United States and Zhigang Peng, Georgia Institute of Technology, Earth and Atmospheric Sciences, Atlanta, GA, United States
Faulting in olivine transforming to wadsleyite and ringwoodite under pressure-temperature conditions of deep slabs (Invited) (1047585)
Tomohiro Ohuchi1, Yuji Higo2, Yoshinori Tange2, Takeshi Sakai1, Kohei Matsuda1 and Tetsuo Irifune1,3, (1)Ehime University, Geodynamics Research Center, Matsuyama, Japan, (2)Japan Synchrotron Radiation Research Institute, Kouto, Japan, (3)Tokyo Institute of Technology, Earth-Life Science Institute, Tokyo, Japan
Metamorphism-Facilitated Faulting in Deforming Metastable Orthopyroxene: Implications for Global Intermediate-Depth Seismicity (1098496)
Yanbin Wang, University of Chicago, Chicago, IL, United States, Feng Shi, China University of Geosciences, Wuhan, State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, Wuhan, China, Jianguo Wen, Argonne National Laboratory, Center for Nanoscale Materials, Argonne, United States, Tony Yu, The University of Chicago, Center for Advanced Radiation Sources, Chicago, United States, Lupei Zhu, Saint Louis University, Earth and Atmospheric Sciences, Saint Louis, MO, United States, Taizi Huang, University of Science and Technology of China, Hefei, China and Kelin Wang, Pacific Geoscience Centre, Geological Survey of Canada, Sidney, BC, Canada
Global constraints on intermediate-depth intraslab stresses from slab geometries and mechanisms of double seismic zone earthquakes (1106712)
Christian Sippl, Czech Academy of Sciences, Institute of Geophysics, Prague, Czech Republic, Armin Dielforder, Leibniz University of Hannover, Institute of Geology, Hannover, Germany, Timm John, Free University of Berlin, Institut für Geologische Wissenschaften, Berlin, Germany and Stefan M Schmalholz, University of Lausanne, Institute of Earth Sciences, Lausanne, Switzerland
Understanding Backazimuth Dependence of Shear Wave Splitting Patterns of S Waves Transmitted Through Strongly Anisotropic Slabs (1118661)
Sharmila Appini, University of Houston, Houston, TX, United States, Hao Hu, University of Houston, EAS, Houston, TX, United States, Neala Creasy, Los Alamos National Laboratory, Geophysics Group, Los Alamos, NM, United States, Leon Thomsen, Delta Geophysics Inc., Houston, United States, Jiaxuan Li, California Institute of Technology, Seismological Laboratory, Pasadena, United States and Yingcai Zheng, University of Houston, Earth and Atmospheric Sciences, Houston, United States
Faulting in deforming natural lherzolite at high pressure and temperature with implications for global intermediate-depth seismicity (1127592)
Man Xu1, Timothy Officer2, Tony Yu2 and Yanbin Wang2, (1)University of Chicago, Chicago, IL, United States, (2)The University of Chicago, Center for Advanced Radiation Sources, Chicago, United States
Transformational Faulting in the Lab, Implications for the Slab (1151216)
Julien Gasc1, Clémence Daigre1, Arefeh Moarefvand1, Damien Deldicque1, Blandine Gardonio2, Pamela C Burnley3, Claudio Madonna4 and Alexandre Schubnel5, (1)Ecole Normale Supérieure Paris, Laboratoire de Géologie, Paris, France, (2)LGLTPE Laboratoire de Géologie de Lyon : Terre, Planètes et Environnement, Villeurbanne Cedex, France, (3)University of Nevada Las Vegas, Geoscience, Las Vegas, United States, (4)Swiss Federal Institute of Technology (ETH), Zurich, Switzerland, (5)Ecole Normale Supérieure, Laboratoire de Géologie, Paris Cedex 16, France
Finite Element Model of Fault Zone of Northeast Japan Subduction Zone for Intermediate Depth Earthquake Initiation. (1160895)
Ashay Panse1, Craig Foster2, S Sindhusuta1 and Sheng-Wei Chi3, (1)University of Illinois at Chicago, Civil, Materials, and Environmental Engineering, Chicago, IL, United States, (2)University of Illinois at Chicago, Chicago, United States, (3)University of Illinois at Chicago, Civil and Materials Engineering, Chicago, IL, United States
Transformational Faulting at High Pressure and Temperature in Fe-rich Olivine (Mg0.25,Fe0.75)2SiO4: Implications for Deep-Focus Earthquakes (1179798)
Timothy Officer1, Man Xu2, Tony Yu2, Amanda Dillman3, David L Kohlstedt3 and Yanbin Wang2, (1)University of Chicago, Chicago, IL, United States, (2)The University of Chicago, Center for Advanced Radiation Sources, Chicago, United States, (3)University of Minnesota Twin Cities, Minneapolis, MN, United States
Exploring possible dynamic triggering of intermediate-depth earthquakes in Northern Chile following the 2010 M8.8 Maule, Chile earthquake (1183526)
Zhigang Peng, Georgia Institute of Technology Main Campus, Atlanta, GA, United States, Yanbin Wang, The University of Chicago, Center for Advanced Radiation Sources, Chicago, United States and Miguel Neves, Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, United States
A Numerical Study on Phase Transformation Induced Material Fracture (1196297)
S Sindhusuta, University of Illinois at Chicago, Civil, Materials, and Environmental Engineering, Chicago, IL, United States, Sheng-Wei Chi, University of Illinois at Chicago, Civil and Materials Engineering, Chicago, IL, United States and Craig Foster, Foster Energy Management Co., Columbus, OH, United States
Seismicity Cluster Analysis of Intermediate-depth Earthquakes in Japan using the Nearest-neighbor Method. (1196694)
Phuc Mach, Georgia Institute of Technology Main Campus, Earth and Atmospheric Sciences, Atlanta, United States, Qiushi Zhai, California Institute of Technology, Seismological Laboratory, Pasadena, United States, Zhigang Peng, Georgia Institute of Technology, Earth and Atmospheric Sciences, Atlanta, GA, United States, Makoto Matsubara, Ntl Rsrch Inst Earth Science, Tsukuba Shi, Japan, Kazushige Obara, The University of Tokyo, Earthquake Research Institute, Tokyo, Japan and Yanbin Wang, The University of Chicago, Center for Advanced Radiation Sources, Chicago, United States
