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Earth, Planets and Space
Fig. 2. | Earth, Planets and Space

Fig. 2.

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. 2.

(a) Hypocenter distribution from May 19 to October 26, 2008. 851 foci are plotted as circles. Color corresponds to focal depth. Other marks are same as in Fig. 1. The five rectangles depict the areas in (c). There are some seismic gap, such as in region B (white oval with white letters), between regions C and D (white oval) and between regions D and E (black letters). Moreover, few earthquakes are located near the trench. (b) Mechanism solution by NIED with focal depth deduced from this study. Thrust type earthquakes are prominent in regions A–D, although no thrust type in region E. (c) Vertical cross-sections of the hypocenters in the forearc region. Most earthquakes distribute the subducting direction of PAC in regions A–D. In contrast, the trend is unclear in region E.

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