INTRODUCTION

Leg 190 returned to the central Nankai Trough accretionary prism southeast of Shikoku Island, revisiting the region drilled previously during Deep Sea Drilling Program Legs 31 and 87 and Ocean Drilling Program Leg 131. Seismic reflection surveys conducted in 1987 defined the regional structural setting of this area (Moore et al., 1990, 1991). A more detailed three-dimensional (3-D) seismic reflection program was carried out off the Muroto Peninsula during 1999 (Bangs et al., 1999; Moore et al., 1999) and provided additional information for locating the drill sites for Leg 190. The purpose of this paper is to amplify the structural setting of the Muroto Transect based on these new seismic reflection data.

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