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Earth, Planets and Space
Fig. 1. | Earth, Planets and Space

Fig. 1.

From: P-wave velocity structure in the southernmost source region of the 2011 Tohoku earthquakes, off the Boso Peninsula, deduced by an ocean bottom seismographic survey

Fig. 1.

Map showing bathymetry and location of the seismic survey in the southernmost part of the Japan Trench. Positions of the OBSs are marked by red solid circles. The thick solid line represents the survey line. Numerals indicate the OBS number. Dashed lines denote the axis of the Japan trench, Sagami trough, and Izu-Ogasawara trench. The bathymetric contour interval is 1000 m. The inset shows the plate boundaries and survey area. The dashed grey line denotes the northeastern limit of the Philippine Sea plate according to Uchida et al. (2009). The white arrows indicate relative motion between the two plates at the plate boundary (Seno et al., 1993, 1996).

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