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doi:10.2204/iodp.proc.322.210.2013

Introduction

Integrated Ocean Drilling Program (IODP) Expeditions 322 and 333 are part of a multistage, multiexpedition effort known as the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE). NanTroSEIZE focuses on drilling, sampling, and placing instruments to understand seismogenic mechanisms and faulting within the Nankai Trough subduction zone.

In this study, we used flow-through permeability tests to measure the vertical permeability of core samples from IODP Sites C0011, C0012, and C0018. Permeability of the incoming sediments (Sites C0011 and C0012; Fig. F1) impacts the response of the sediments to increasing total stress as they are subducted or accreted, as well as the transmittal of fluids from beneath the accretionary prism and the alteration of the subducting basaltic crust. Recovered sediments from Sites C0011 and C0012 are composed of pelagic and hemipelagic mud, with some volcanic ash and silty, sandy, and volcaniclastic turbidites (see the “Site C0011” and “Site C0012” chapters [Expedition 322 Scientists, 2010a, 2010b]; Expedition 333 Scientists, 2012b, 2012c, 2012d). Permeability of sediments in the megasplay fault region impacts pore pressure generation and may affect slope stability. The sample from Site C0018 consists of slope sediment from the megasplay region from within an interval identified as a mass transport deposit (Expedition 333 Scientists, 2012d).

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