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Fig. 6. | Earth, Planets and Space

Fig. 6.

From: Precise aftershock distribution of the 2011 off the Pacific coast of Tohoku Earthquake revealed by an ocean-bottom seismometer network

Fig. 6.

Vertical sections of P-wave velocity structures and the aftershock distribution along the refraction profile (a) for the off-Sanriku region, (b) for the off-Miyagi region, (c) for the off-Fukushima region, and (d) for the off-Ibaragi region. Profiles (a), (b), (c) are perpendicular to the Japan Trench, and profile (d) is parallel to the trench. Positions of each profiles are indicated in Fig. 5. The aftershocks within a 50-km wide box on both sides along the profile are projected onto the seismic survey profiles for profile a), b), and c). For profile d), a box wide is 10 km. Red circles indicate the hypocenters of the aftershocks, and diameters of circles correspond to magnitudes. Inverted triangles indicate the projected position of the OBSs for aftershock observations. Orange and yellow bars above the structure indicate the region where slip is greater than 12 m and 4 m, respectively. Grey circles indicate hypocenters from the previous OBS observations before the mainshock.

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