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Fig. 13 Shaded bathymetric map of the southern Japan Trench. Red lines show positions of the
profiles in Fig. 14 . Other conventions are identical to Fig. 7
the triple junction, Mogi Fan, is very flat. Previous works indicated thick sediment
transported along Sagami Trough there (Ogawa et al. 1989 ). The strike of the Izu-
Ogasawara Trench is almost N-S in the study area except for north of 35°10¢N and
33°-33°30¢N. Those north of 35°10¢N and between 33°N and 33°30¢N strike
N25°E and N10°W, respectively. The Mogi Seamount is subducting at 32°45¢N.
The height of the seamount is about 4,200 m, which is larger than that of the
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