Physics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29s..12n&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 19, pp. 12-1, CiteID 1906, DOI 10.1029/2002GL015008
Physics
1
Seismology: Seismicity And Seismotectonics, Seismology: Volcano Seismology (8419), Volcanology: Magma Migration
Scientific paper
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.
Nishizawa Atsushi
Ono Takafumi
Otani Yosuke
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