by Hiroyuki Goto, Disaster Prevention Research Institute, Kyoto University, dated: 2016/04/15, updated: 2016/04/21.
Mj6.5 earthquake event hit Kumamoto prefecture, Japan, at 21:26, April 14th (local time: GMT+09), 2016. Second Mj7.3 earthquake event hit Kumamoto and Oita prefectures at 01:46, April 16th (local time: GMT+09). The epicenters were estimated in about 10km distance, and the hypocenter depths were 11km and 12km, respectively [1,2]. Japan Meteorological Agency (JMA) named the sequence of earthquakes ‘The 2016 Kumamoto Earthquake’ [3]. CMT solutions (source mechanism) imply right lateral faultings for both events [4]. Blue and red points in following figure are the epicenters of aftershocks, following the first and the second events, respectively. The hypocenters are distributed along the Futagawa fault and Hinagu fault, and also strike angles are estimated in the direction of the faults. Therefore, some relationships between the earthquake events and the faults are expected. Notice that seismic activity is extended to Oita prefecture, north-eastern region of Kumamoto prefecture.
Read the complete web report: http://wwwcatfish.dpri.kyoto-u.ac.jp/~goto/eq/20160414/report_en.html.
