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Earth, Planets and Space
Fig. 18 | Earth, Planets and Space

Fig. 18

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

Fig. 18

(Top) Fine seafloor topography around Yaeyama Rift. Blue squares and a red asterisk in the topographic maps are positions of the OBSs and the epicenter of the 1938 M7.2 Miyako-jima–Hokusei-oki Earthquake, respectively. YoR Yonaguni Rift, YaR Yaeyama Rift, MR Miyako Rift, MS Miyako Seamount. (bottom right) Shallow (focal depths ≤ 30 km) seismic activity on the bathymetric map. Black dots show epicenters determined by the JMA (1923–2018, February). Pink focal mechanisms are from the F-net CMT Catalog by NIED (1997–2018, February), and blue are from the GCMT Catalog by Global Centroid-Moment-Tensor Project (1976–2018, February). Three seismic clusters of a, b, and c on the bathymetric maps are projected on the MCS profile (time section) for ECr12 on the bottom left

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