MR42A:
Precursory Deformation Before Dynamic Failure I

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Session ID#: 34756

Session Description:
The fracturing and frictional properties of rocks exert a key control on precursory deformations before dynamic ruptures. New multi-scale evidences reveal that these properties are controlled by a number of mechanisms such as granular flow, time-dependent deformation and phase transformations. At the field scale micro-earthquakes along creeping faults elucidate the evolution of frictional properties during the seismic cycle. At the outcrop scale, it is now possible to quantitatively characterize fractures and fault zones hydro-mechanical properties. At the laboratory scale new experiments are able to investigate the 3D microstructure evolution of a deforming rock at conditions representative of the 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 precursory deformation mechanisms before major ruptures.
Primary Convener:  Sergio Vinciguerra, University of Turin, Earth Sciences, Turin, Italy
Conveners:  François Renard, University of Oslo, Oslo, Norway, Roland Burgmann, University of California Berkeley, Department of Earth and Planetary Science, Berkeley, United States and Wenlu Zhu, University of Maryland, College Park, United States
Chairs:  Roland Burgmann, University of California Berkeley, Earth and Planetary Science, Berkeley, United States, François Renard, University Joseph Fourier Grenoble, Grenboble, France, Sergio Vinciguerra, University of Turin, Earth Sciences, Turin, Italy and Wenlu Zhu, University of Maryland, College Park, United States
OSPA Liaison:  Sergio Vinciguerra, University of Turin, Earth Sciences, Turin, Italy

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

5104 Fracture and flow [PHYSICAL PROPERTIES OF ROCKS]
7209 Earthquake dynamics [SEISMOLOGY]
8010 Fractures and faults [STRUCTURAL GEOLOGY]
8163 Rheology and friction of fault zones [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Large-scale unloading processes preceding the 2015 Mw 8.4 Illapel, Chile earthquake (286739)
Hui Huang, University of California Los Angeles, Los Angeles, CA, United States and Lingsen Meng, University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States
Slow Slip and Earthquake Nucleation in Meter-Scale Laboratory Experiments (Invited) (232675)
Gregory Mclaskey, Cornell University, Civil and Environmental Engineering, Ithaca, NY, United States
Transient radon signals driven by fluid pressure pulse, micro-crack closure, and failure during granite deformation experiments (Invited) (215458)
Alexandre Schubnel, Ecole Normale Supérieure/CNRS UMR 8538, Laboratoire de Géologie, Paris, France, Frederic Girault, Institut de Physique du Globe de Paris, Paris, France; Institut de Physique du Globe, Paris, France and Eric Pili, CEA, DAM, DIF, Arpajon, France
A three-dimensional ‘Kaiser damage-memory’ effect through true-triaxial loading (252049)
Philip G Meredith1, John Browning1, Sophie R Harland2, David Healy3, Chris Stuart4 and Thomas Matthew Mitchell1, (1)University College London, Rock and Ice Physics and Seismological Laboratory, London, United Kingdom, (2)University of Aberdeen, Aberdeen, United Kingdom, (3)University of Aberdeen, School of Geosciences, Aberdeen, United Kingdom, (4)University College London, Rock & Ice Physics Laboratory, London, United Kingdom

See more of: Mineral and Rock Physics