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doi:10.2204/iodp.proc.314315316.224.2019

Introduction

Frictional strength is an important basic geotechnical parameter for sediment deformation because the strength controls the structure and faulting processes in convergent margins. Here, we measured the frictional strength on five core samples at a range of effective normal stresses in order to establish basic strength measurements for the frontal thrust region of the Nankai Trough. Such strength measurements may be used for studies of shallow fault slip (Kopf and Brown, 2003; Ikari and Saffer, 2011) or studies of accretionary wedge geometry (Kimura et al., 2007; Ikari et al., 2013). The samples we tested were recovered during Integrated Ocean Drilling Program (IODP) Expedition 316, part of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE). During NanTroSEIZE, several sites were drilled and cored along a transect offshore Kii peninsula, Japan (Figure F1). We focus on two sites in the frontal thrust region, Sites C0006 and C0007.

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