MR33C:
Precursory Deformation before Dynamic Failure I

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Session ID#: 16440

Session Description:
The frictional properties of rocks exert a key control on precursory deformations before dynamic ruptures. New multi-scale evidence reveals a number of deformation mechanisms are involved, such as the competition between granular flow, healing, time-dependent deformation, and mineral phase transformations. At the field scale microearthquakes along creeping faults elucidate the evolution of frictional properties during the seismic cycle and sometimes foreshocks are proposed to be associated with slow slip processes. At the outcrop scale, it is now possible to quantitatively characterize fault zones hydro-mechanical properties. At the laboratory scale new experiments are able to investigate the 3-dimensional microstructure evolution of a deforming rock at conditions representative of a seismogenic zone. All these approaches show a competition between healing and fault reloading, and ultimately can unravel the precursors to rupture events. This session aims to integrate field, laboratory, seismological and geodetic data to address the multi-scale deformations precursory to major ruptures.
Primary Convener:  Sergio Vinciguerra, University of Turin, Earth Sciences, Turin, Italy
Conveners:  François Renard, University of Oslo, Oslo, Norway, Wenlu Zhu, University of Maryland, College Park, United States and Roland Burgmann, University of California Berkeley, Department of Earth and Planetary Science, Berkeley, United States
Chairs:  Roland Burgmann, University of California Berkeley, Department of Earth and Planetary Science, Berkeley, United States and François Renard, University of Oslo, Oslo, Norway
OSPA Liaison:  François Renard, University of Oslo, Oslo, Norway
Co-Organized with:
Tectonophysics, and Tectonophysics

Cross-Listed:
  • NH - Natural Hazards
  • S - Seismology
  • T - Tectonophysics
  • V - Volcanology, Geochemistry and Petrology

Proposed Co-Organized Session with:
  • T - Tectonophysics
Index Terms:

3902 Creep and deformation [MINERAL PHYSICS]
7230 Seismicity and tectonics [SEISMOLOGY]
8118 Dynamics and mechanics of faulting [TECTONOPHYSICS]
8163 Rheology and friction of fault zones [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Partial Unlocking of Faults by Mixed Aseismic and Seismic Slip Processes prior to Earthquake (Invited) (121509)
Aitaro Kato, University of Tokyo, Bunkyo-ku, Japan
Izmit Foreshocks Revisited (152908)
William L Ellsworth, Stanford University, Department of Geophysics, Stanford, CA, United States and Fatih Bulut, Bogazici University, Kandilli Observatory and ERI.-Department of Geodesy, Istanbul, Turkey
Matched-filter Detection of the Missing Pre-mainshock Events of the 2015 Gorkha, Nepal earthquake (191075)
Hui Huang1, Lingsen Meng1, Milton Percy Plasencia Linares2, Yali Wang3, Liangshu Wang4 and Mingjie Xu4, (1)University of California Los Angeles, Los Angeles, CA, United States, (2)Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy, (3)CENC China Earthquake Networks Center, Beijing, China, (4)Nanjing University, Nanjing, China
Nucleation process of M~2 earthquakes on the San Andreas fault predicted by rate-and-state fault models with SAFOD drill-core data (130025)
Yoshihiro Kaneko, Kyoto University, Department of Geophysics, Kyoto, Japan, Brett M Carpenter, University of Oklahoma Norman Campus, School of Geosciences, Norman, United States and Stefan Bjorklund Nielsen, University of Durham, Department of Earth Sciences, Durham, United Kingdom
Development of Pore Pressures in Compacting Fault Gouge; Implications for the Strength and Stability of Faults (Invited) (121962)
Dan Faulkner, University of Liverpool, Earth, Ocean and Ecological Sciences, Liverpool, L69, United Kingdom, Catalina Sanchez Roa, University College London, London, United Kingdom and Carolyn J Boulton, Victoria University of Wellington, Wellington, New Zealand
Dynamic triggering during rupture nucleation in sandstone (199992)
Aurelien Nicolas, Ecole Normale Supérieure Paris, Paris, France, Kristel Chanard, University of Lausanne, Lausanne, Switzerland, Soumaya Latour, Ecole Normale Supérieure Paris, Laboratoire de Géologie, Paris, France, Takahiro Hatano, University of Tokyo, Bunkyo-ku, Japan, Sergio Vinciguerra, University of Turin, Earth Sciences, Turin, Italy and Alexandre Schubnel, CNRS, Paris Cedex 16, France
Unstable Slip Events at 600 °C in Simulated Fault Gouges from the Principal Slip Zone (PSZ) of the Alpine Fault. (147583)
Andre R Niemeijer1, Carolyn J Boulton2, Virginia Toy3, John Townend2 and Rupert Sutherland2, (1)Utrecht University, Department of Earth Sciences - HPT laboratory, Utrecht, Netherlands, (2)Victoria University of Wellington, Wellington, New Zealand, (3)University of Otago, Dunedin, New Zealand
Asperity-Type Potential Foreshock Sources Driven by Nucleation-Induced Creep within a Rate-and-State Fault Model (190119)
Natalie Higgins, California Institute of Technology, Pasadena, CA, United States and Nadia Lapusta, California Institute of Technology, Department of Mechanical and Civil Engineering, Pasadena, CA, United States

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