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Earth, Planets and Space
Fig. 4. | Earth, Planets and Space

Fig. 4.

From: Spatial distribution of earthquakes off the east coast of the Kanto region along the Japan Trench deduced from ocean bottom seismographic observations and their relations with the aftershock sequence of the 2011 off the Pacific coast of Tohoku Earthquake

Fig. 4.

(a) Hypocenter distribution from May 19 to October 26, 2008 with the 2008 earthquake on May 8, 2008 (Japan Standard Time). Circles denote hypocenters in this study and the star in region Z shows the 2008 earthquake. Color corresponds to focal depth. The rounded rectangle is a remarkable seismic gap. Broken and solid lines denote contour intervals of 1 km and 7 km water depth, respectively. (b) Aftershock distribution (March 11–31, 2011, Mj > 5.0) by JMA. Stars show the aftershocks. Color and size of the stars correspond to focal depth and magnitude, respectively. The largest green star in grey circle Y indicates the Mj 7.7 earthquake. It is located in one of the high seismicity regions in (a). The rounded triangle is the remarkable seismic gap. Broken and solid lines denote contour intervals of 1 km and 7 km water depth, respectively. X, Y, Z, S and T correspond to those in Fig. 5.

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