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Fig. 1. | Earth, Planets and Space

Fig. 1.

From: A normal-faulting seismic sequence triggered by the 2011 off the Pacific coast of Tohoku Earthquake: Wholesale stress regime changes in the upper plate

Fig. 1.

(a) Temporal changes in the magnitude of earthquakes occurring in northern Ibaraki Prefecture (JMA catalog within in the blue rectangle in Fig. 1(b)). The red broken vertical line is the origin time of the 2011 off the Pacific coast of Tohoku Earthquake. (b) Map of the hypocenters and seismic stations in northern Ibaraki Prefecture and southern Fukushima Prefecture. Earthquakes are shown as circles scaled according to magnitude and color coded with depth. The moment tensor focal mechanisms of large events (NIED) are plotted with the origin time. The gray triangles are permanent continuous seismic stations. Active faults are shown by gray lines. The blue rectangle indicates the location of Fig. 2(a). The broken lines are borders between prefectures. The inset shows the location of the studied area and the rupture area of the 2011 Tohoku Earthquake.

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