Location maps of the survey area. The solid red lines are the MCS lines of this survey. MaK, Manazuru Knoll; SK, Sagami Knoll; MC, Miura Canyon; MiK, Miura Knoll; KC, Katase Canyon; HS, Hatsu-shima; SBF, Sagami Bay Fault; KMF, Kozu-Matsuda Fault (blue line). Black broken lines indicate the traces of main active faults indicated by Ohkouchi (1990). The yellow arrow shows the crustal movement velocity relative to the stable part of the Eurasian plate at the seafloor reference point (Saito et al. 2008).