期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 357, 期 -, 页码 145-151出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2012.09.039
关键词
Miyake-jima; very-long-period seismic pulse; caldera formation
Very-long-period (VLP) pulses with widths of 20 s on velocity seismograms were observed during volcanic activity at Miyake-jima Volcano, Japan in 2000. The VLP events occurred repeatedly during a few days prior to caldera formation and essentially vanished following the onset of caldera collapse. Waveform inversions of the pulse-like signals point to a source offset 3.5 km beneath and 1 km south of the summit. A candidate for the source mechanism is the inflation of an elliptical cylinder with axis tilted 20-30 degrees from vertical and major axis of the elliptical cross section oriented northeast-southwest. The inferred mechanism appears consistent with a step-like pressurization of a magma reservoir impacted by a falling rock mass in response to gravitational instability. The repeated occurrences of the rock collapses lead to the caldera formation at Miyake-jima. (C) 2012 Elsevier B.V. All rights reserved.
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