Session outline
Solid Earth Sciences(S)
Session Sub Category Seismology(SS)
Session ID S-SS01
Title Slip to the Trench in Megathrust Earthquakes
Short title Slip to the Trench
Convener Name Shuichi Kodaira
Affiliation Institute for Research on Earth Evolution
Japan Agency for Marine-Earth Science and Technology
Co-convener 1. Name James Mori
Affiliation Earthquake Hazards Division, Disaster Prevention Research Institute, Kyoto University
Co-convener 2. Name Kohtaro Ujiie
Affiliation Graduate School of Life and Environmental Sciences, University of Tsukuba
Co-convener 3. Name Kelin Wang
Affiliation Geological Survey of Canada
Co-convener 4. Name Michael Strasser
Affiliation Geological Institute, ETH Zurich
Co-convener 5. Name Demian Saffer
Affiliation Department of Geoscience, The Pennsylvania State University
International Symposium 'International Symposium' in addition to Scientific session.
Language English
Scope Seismological, tsunami, and geodetic data of the 2011 Tohoku-oki earthquake indicate large slip of more than 50 m on the shallow part of the subduction megathrust. Coseismic slip reaching the trench has been inferred from comparisons of seismic and bathymetry images before and after the earthquake. At the Nankai Trough, ocean drilling provided frictional-heating evidence for seismic slip of a frontal thrust. In addition, anomalous slip of the shallow megathrust producing so-called tsunami earthquakes has occurred at several subduction zones. Recent friction experiments suggest that earthquake rupture propagates easily through velocity-strengthening materials by high-velocity weakening. These observations suggest a need to re-examine the widely accepted conceptual model of megathrust slip behavior, especially for the near-trench shallow portion. This session will integrate field observations, experimental results and modeling studies to understand seismic and aseismic slip of the shallow part of the subduction fault.
Type of presentation Oral and Poster presentation
Invited papers James Kirkpatrick (Univ. California Santa Cruz)
SHIMAMOTO, Toshi ( Institute of Geology China Earthquake Administration)
Matt Ikari (MARUM Univ. Bremen)
IKEHARA, Ken (AIST, Geological Survey of Japan)