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Earth, Planets and Space
Fig. 5. | Earth, Planets and Space

Fig. 5.

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. 5.

(a) Time sequences of the aftershocks (Mj > 3.0), which occurred within 4 hours after the mainshock. Color indicates the elapsed time from the mainshock and black means that the events occurred from 1 hour to 4 hours after the mainshock. Aftershocks had only occurred in region X before the Mj 7.7 earthquakes occurred in region Y. At that time, there were no large earthquakes in region Z, where the 2008 earthquake (Mj 7.0) occurred. The square shows the Mj 7.0 foci for reference. (b) Time sequences of the aftershocks (Mj > 3.0), which occurred on March, 2011. Color indicates the elapsed time from the mainshock, and black means 2 days or more after the mainshock. Following activities in regions X, Y and Z, remarkable aftershocks occurred in region S just close to the Japan Trench and in region T where PHS exists.

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