Fig. 1

Map showing seismological stations of the OJP array and permanent stations around the OJP. The black and small gray triangles denote the stations of the OJP array, and the open triangles denote permanent stations. Seismograms at the locations of the black and open triangles were analyzed in the present study. The small gray triangles denote stations with low signal-to-noise ratios of multiple ScS waves or stations that were terminated at the time of the event on Aug. 31, 2016