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Chinese Taipei Geophysical Society
Graduate Institute of Applied Geology, National Central University
Department of Earth Sciences, National Central University
Title:Stress states and sediment deformation at the
Nankai subduction zone
Speaker:Dr. Hiroko Kitajima (Texas A&M University)
Date:July 11, 2016,(Monday), 14:00~15:30
Location:S-253, Science Building 1, National Central University
Understanding the mechanics of plate boundary earthquakes requires a sound
investigation of in-situ stress condition, slip behavior, and deformation
mechanisms. It is critical to well characterize not only the in-situ stress and
pore pressure condition, but also an absolute strength and mechanical behavior
at stress conditions. Compaction of the subducting sediments plays an
important role in the deformation in the shallow portion of subduction zones
because the deformation mode (either brittle or ductile) and strength of porous
rocks are largely dependent on both porosity and pressure. In this talk, I will
present results of triaxial deformation experiments on (1) core samples
currently subducting at the Nankai Trough and (2) prism samples from the
Shimanto complex, which have been subducted, underthrusted, and
underplated along the ancient plate boundary. Based on the experimental
results, I will discuss the stress state and strength from the trench to the
seismogenic depths.
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