Fig. 14
From: Shallow structure and late quaternary slip rate of the Osaka Bay fault, western Japan
Seismic profile Line 7 (Boomer). TWT: two-way travel time. Vertical line represents location of cross lines. (a) Uninterpreted image (post-stack, vertical exaggeration = 20). Red triangle: representative seafloor multiple. (b) Trace of seismic reflectors in (a) and interpreted image. Blue dotted line: estimated anticlinal axial surface. Yellow dotted line: estimated synclinal axial surface. Star shows location of sediment thickness measurement in Fig. 24. Note the onlap of Units A1’ and A2 onto Unit B1, underlain by continuous tilting of strata by the hanging wall anticline of the Osaka Bay Fault. An additional synclinal fold structure is observed west of the hanging wall anticline (CMP #400–1200). The widths of the syncline and anticline reported in the main text are estimated from the width of the two points where the folded strata intersect with the inferred undeformed stratal dip (Additional file 1: Figs. S2, S3)