Fig. 1.
Tectonic setting of the Fukushima-Hamadori area. The solid lines are active fault traces presented by the Research Group for Active Faults of Japan (1991). White stars are the earthquakes with magnitudes larger than Mj 5 that occurred in the crust after the Mw 9.0 event on 11 March, 2011. Beachball diagrams are from NIED (National Research Institute for Earth Science and Disaster Prevention) Earthquake Mechanism Search (http://www.fnet.bosai.go.jp/event/search.php?LANG=en).