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Originally published in Science Express on 13 February 2003
Science 28 March 2003:
Vol. 299. no. 5615, pp. 2058 - 2061
DOI: 10.1126/science.1081195
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Reports

Magmatic Dike Resonances Inferred from Very-Long-Period Seismic Signals

Hiroyuki Kumagai,1* Koji Miyakawa,1 Hiroaki Negishi,1 Hiroshi Inoue,1 Kazushige Obara,1 Daisuke Suetsugu2

Very-long-period (VLP) signals showing simple decaying harmonic oscillations with periods near 10 seconds and lasting for about 300 seconds were observed in association with an earthquake swarm that occurred beneath Hachijo Island, Japan. Results from the source-mechanism analysis and waveform simulation based on a fluid-filled crack model consistently point to the resonance of a dike filled with a basaltic magma as the source of the VLP signals. Thus, VLP signals can be used to probe the state of the fluid and dynamic processes within a volcanic system.

1 National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Japan.
2 Institute for Frontier Research on Earth Evolution, Japan Marine Science and Technology Center, Yokosuka, Japan.
*   To whom correspondence should be addressed. E-mail: kumagai{at}bosai.go.jp

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Shallow-conduit dynamics at Stromboli Volcano, Italy, imaged from waveform inversions.
B. Chouet, P. Dawson, and M. Martini (2008)
Geological Society, London, Special Publications 307, 57-84
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