The largest earthquake swarm ever recorded in Japan began off the islands of Miyake-jima, Kozu-shima and Nii-jima, and was linked to volcanic activity on Miyake-jima, at the northern end of the volcanic front of the Izu-Ogasawara (Bonin) arc. Ocean bottom seismographic observations made directly above the swarm region gave clear indication of a magmatic intrusion. The hypocenter distribution shows a vertical sheet, 2 km wide and at a depth of 12-20 km, that broadens markedly at depths up to 12 km. The P wavespeed structure obtained from a seismic refraction survey shows no significant difference in the characteristics of the shallow crust between the strong swarm region and inactive region. However, a low wavespeed region was detected 10-15 km northwest of Miyake-jima.
CITATION STYLE
Nishizawa, A., Ono, T., & Otani, Y. (2002). Seismicity and crustal structure related to the Miyake-jima volcanic activity in 2000. Geophysical Research Letters, 29(19). https://doi.org/10.1029/2002GL015008
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