Integrated Ocean Drilling Program (IODP) Expedition 319 Site C0010 (proposed Site NT2-01J) is a riserless drilling site located 3.5 km along strike of previously drilled and cored IODP Site C0004 (Figs. F1, F2) and was planned to penetrate the megasplay fault at ~410 meters below seafloor (mbsf) and ~150 m into the footwall. A summary of Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) drilling around Site C0010 is shown in Figure F1 . The operational and scientific objectives at this

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... e were to • Collect logging-while-drilling (LWD) and measurement-whiledrilling (MWD) data to 560 mbsf to complement LWD and core data collected during IODP Expeditions 314 and 316 at Site C0004 (Kinoshita et al., 2008; Kimura et al., 2008) in order to • Characterize the lithology, physical properties, and structural geology of the shallow slope apron, thrust wedge, megasplay fault, and overridden slope apron and • Correlate observations between Sites C0004 and C0010 to assess along-strike variations in physical properties and fault zone architecture; • Install casing to ~550 mbsf with screened joints (~20 m of screened interval) spanning the megasplay fault as defined from logging data in order to provide hydraulic communication between instruments inside casing and the fault zone in preparation for planned observatory installation in 2010, 2011, or beyond; • Conduct a "dummy run" of the instrument package (including a strainmeter and broadband seismometer) to evaluate shock and acceleration caused by hole reentry and instrument emplacement, for future installation of a strainmeter and seismometer package at this site as part of a permanent observatory; and • Suspend the hole with a temporary monitoring system (a "smart plug") affixed to a retrievable casing packer (bridge plug), in order to record pore pressure and temperature within the screened interval of the formation. The temporary instrument package will provide continuous monitoring during the time between drilling of the site (this expedition) and permanent observatory installation. This planned per-