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Earth, Planets and Space
Fig. 16 | Earth, Planets and Space

Fig. 16

From: Seismic structure of rifting in the Okinawa Trough, an active backarc basin of the Ryukyu (Nansei-Shoto) island arc–trench system

Fig. 16

(Top left) Epicenter distribution before the Satsuma-hanto Seiho-oki Earthquake (M7.1) on November 14, 2015. Black dots show epicenters with depths shallower than 30 km as determined by the Japan Metrological Agency (1923–2015, November 14). Focal mechanisms are from the F-net CMT Catalog by the National Research Institute for Earth Science and Disaster Resilience (depth ≤ 30 km, 1997–2015, November 14). The locations of the OBSs on ECr11 in the northernmost OT are indicated by green squares. The MCS profile (depth-converted section) and Vp model along ECr11 are shown on the center and bottom left. The Vp of the middle crust between two broken lines is slightly slower than both sides. (Top right) Epicenter distribution of the M7.1 earthquake and their aftershocks (depth ≤ 30 km, 2015, November 14–2017, May 2). CMT mechanisms, yellow, M ≥ 6; pink, M ≥ 5. A tsunami with a height of 30 cm caused by the M7.1 earthquake was observed at Nakanoshima island shown by N in the map. The MCS time section across the aftershock area is enlarged on the bottom right

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