MR32A:
Evolving Fault Zone Properties: From Coseismic Weakening and Damage Through Postseismic Fracture Healing II

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Session ID#: 34703

Session Description:
Understanding changes in fault-zone properties throughout the seismic cycle, over shorter characteristic times and at the appropriate length scales, are necessary to characterize earthquake occurrence and co-seismic effects. Inter-seismic periods allow for kinetically sluggish processes to occur that might also have important feedbacks on co-seismic slip behavior. We welcome contributions that explore processes and phenomena that alter the mechanical, chemical and/or hydrologic properties of seismic and aseismic faults. Interesting studies may originate from rock-deformation experiments, geologic and seismological observations, and numerical modeling.
Primary Convener:  Brooks Proctor, US Geological Survey, Earthquake Science Center, Menlo Park, CA, United States
Conveners:  Nicholas M Beeler, USGS Geological Survey, Earthquake Science Center, Menlo Park, CA, United States, Thomas Matthew Mitchell, University College London, Rock and Ice Physics and Seismological Laboratory, London, United Kingdom and David L Goldsby, University of Pennsylvania, Department of Earth and Environmental Sciences, Philadelphia, PA, United States
Chairs:  David L Goldsby, University of Pennsylvania, Philadelphia, PA, United States and Thomas Matthew Mitchell, University College London, Department of Earth Sciences, London, United Kingdom
OSPA Liaison:  Brooks Proctor, US Geological Survey, Earthquake Science Center, Menlo Park, CA, United States
Index Terms:

5199 General or miscellaneous [PHYSICAL PROPERTIES OF ROCKS]
8012 High strain deformation zones [STRUCTURAL GEOLOGY]
8118 Dynamics and mechanics of faulting [TECTONOPHYSICS]
8163 Rheology and friction of fault zones [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Heterogeneity in the Fault Damage Zone: a Field Study on the Borrego Fault, B.C., Mexico (262390)
Giles Ostermeijer1, Thomas Matthew Mitchell2, Matthew Thomas Dorsey3, John Browning4, Thomas K Rockwell5, Frans M. Aben6, John Mackrain Fletcher7 and Nicolas Brantut1, (1)University College London, Department of Earth Sciences, London, United Kingdom, (2)University College London, Rock and Ice Physics and Seismological Laboratory, London, United Kingdom, (3)Texas A&M University College Station, Department of Geology and Geophysics, College Station, United States, (4)Pontificia Universidad Católica de Chile, Department of Mining Engineering and Department of Structural and Geotechnical Engineering, Santiago, Chile, (5)San Diego State University, Earth Sciences, San Diego, CA, United States, (6)University College London, London, United Kingdom, (7)CICESE, San Diego, United States
A Tensile Origin for Pulverized Fault Zone Rock (228949)
Rene C St. Julien, University of Texas at Arlington, Arlington, TX, United States, W. Ashley Griffith, Ohio State University Main Campus, Columbus, OH, United States and Hoagy O. OGhaffari, PhD, Massachusetts Institute of Technology, Earth, Atmospheric, and Planetary Sciences, Cambridge, United States
Frictional behaviour and evolution of rough faults in limestone (229180)
Christopher Harbord1, Stefan Bjorklund Nielsen2, Nicola De Paola3 and Robert Holdsworth3, (1)University College London, Department of Earth Sciences, London, United Kingdom, (2)Durham University, Department of Earth Sciences, Durham, United Kingdom, (3)Durham University, Earth Sciences, Durham, United Kingdom
Damage Recovery in Carrara Marble (240289)
Gabriel Meyer1, Nicolas Brantut2, Thomas Matthew Mitchell3 and Philip G Meredith3, (1)EPFL, Laboratory of Experimental Rock Mechanics, Lausanne, Switzerland, (2)University College London, Department of Earth Sciences, London, United Kingdom, (3)University College London, Rock and Ice Physics and Seismological Laboratory, London, United Kingdom
Healing in Unconsolidated Granular Earth Materials: a Mechanistic Theory (212013)
Charles Lieou1, Eric G Daub2, Robert E Ecke1 and Paul A Johnson1, (1)Los Alamos National Laboratory, Los Alamos, NM, United States, (2)Center for Earthquake Research and Information, Memphis, TN, United States
The Physical Mechanism of Frictional Aging Revealed by Nanoindentation Creep (260144)
Christopher Thom1, Robert W Carpick2 and David L Goldsby1, (1)University of Pennsylvania, Department of Earth and Environmental Sciences, Philadelphia, PA, United States, (2)University of Pennsylvania, Philadelphia, PA, United States
Ultrasonic Tomography of Fractured Rocks to Characterize Elastic Weakening Induced by Finite-Amplitude Waves (252250)
Jacques Riviere, Université Grenoble Alpes, ISTerre (Institute of Earth Sciences), Grenoble, France and Philippe Roux, ISTerre Institute of Earth Sciences, Grenoble, France
Micromechanics of shear localization in granular rocks - effect of temperature (292299)
Taka Kanaya, Brown University, Providence, RI, United States and Greg Hirth, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States

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