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doi:10.2204/iodp.proc.338.201.2014 IntroductionThe Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) is dedicated to studying the fault mechanics and seismogenesis of the thrusting Philippine Sea plate under the Eurasian plate by drilling, logging boreholes, 3-D seismic imaging, core sampling, and modeling (see the “Expedition 338 summary” chapter [Strasser et al., 2014]). During IODP Expedition 338, a slope basin seaward of the megasplay was logged and cored at Site C0021 (Figs. F1, F2). The slope basin, characterized in 3-D seismic data by stacked mass transport deposits (MTDs) (Strasser et al., 2011), was drilled and sampled in Hole C0018A during Expedition 333 and logged during Expedition 338 to define the Quaternary mass-movement event stratigraphy and to analyze physical properties to constrain sliding dynamics and tsunamigenic potential. During Expedition 338, logging while drilling (LWD) to 294 meters below seafloor (mbsf) and coring to 194.5 mbsf were conducted at Site C0021. This site is located ≈2 km northwest of Site C0018 and at a more proximal site for MTDs than observed at Site C0018 (Fig. F2). LWD and coring at Site C0021 therefore provide important information on the nature, provenance, and kinematics of MTDs. Particle size distribution is a fundamental property that plays a key role in the dynamic behavior of submarine landslides (Sawyer et al., 2012). Our objective was to measure downcore particle size distributions with focus on the MTDs. We used hydrometer particle size analysis and classified sediment type according to the Shepard (1954) classification (Fig. F3). We analyzed 49 samples (Table T1) collected at the Kochi Coring Facility, Japan, in April 2013. |
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