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中華民國地球物理學會 國立中央大學應用地質研究所、地球科學學系 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 Abstract: 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.