Fig. 6
From: Strong motions observed by K-NET and KiK-net during the 2016 Kumamoto earthquake sequence
a Acceleration waveforms observed at OIT009 and OITH11 which show the direct waves from M7.3 event and the wave arriving later generated by the induced earthquake near these stations. b Record section of acceleration waveforms band-pass filtered between 0.1 and 5 s. The broad orange line corresponds to the apparent velocity of 3.5 km/s. In the map, the triangles show the stations used to plot the record section and the white cross does the location of the induced event estimated in this study. The epicenters of the shallow events determined by NIED Hi-net are also shown in the map: (black circles) the events that occurred before M6.5 event (January 1, 2015, to 21:25 April 14, 2016); (blue circles) the events that occurred between M6.5 and M7.3 events; (red circles) the events that occurred after M7.3 event (1:24 April 16, 2016, to May 31, 2016)