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  1. 防災科研関係論文

Very long period seismic signals observed before the caldera formation with the 2000 Miyake-jima volcanic activity, Japan

https://nied-repo.bosai.go.jp/records/4508
https://nied-repo.bosai.go.jp/records/4508
5084fe45-9098-4ef1-9b33-a6e93170fedf
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Very long period seismic signals observed before the caldera formation with the 2000 Miyake-jima volcanic activity, Japan
言語
言語 eng
著者 Tomokazu Kobayashi

× Tomokazu Kobayashi

en Tomokazu Kobayashi

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Takao Ohminato

× Takao Ohminato

en Takao Ohminato

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Yoshiaki Ida

× Yoshiaki Ida

en Yoshiaki Ida

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Eisuke Fujita

× Eisuke Fujita

en Eisuke Fujita

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抄録
内容記述タイプ Other
内容記述 Very long period seismic signals, whose waveform consists of an initial impulsive signal and a later oscillatory wave with 0.2 or 0.4 Hz in dominant frequency, were observed before the caldera formation in the 2000 activity of Miyake-jima volcano, Japan. The results of waveform inversion show that the initial and later parts can be explained by a northward single force of 1.5 × 108 N working at a depth of 2 km beneath the summit and a moment tensor solution at a depth of 5 km below and 2 km southwest of the summit with ?1012 Nm, respectively. A clear positive correlation of the amplitudes between the two sources strongly suggests that the shallow single force triggers the deeper moment source in spite of the several km distance between the two sources. To analyze the source time functions of the moment tensor that do not always oscillate in phase, we introduce a new method of moment tensor diagonalization which is performed in the frequency domain. According to the analysis, the two principal components have similar amplitudes and are greater than the third principal component, suggesting an axially symmetric oscillation. One of the possible systems is a combination of two cracks intersecting perpendicularly. Our interpretation is that the single force was generated when magma containing rock blocks suddenly began to move in a choked subsurface magma path, and the resultant pressure waves propagated and excited a resonance oscillation of the two cracks.
言語 en
書誌情報 en : Journal of Geophysical Research: Solid Earth

巻 114, 号 2, 発行日 2009-02-04
出版者
言語 en
出版者 Blackwell Publishing Ltd
ISSN
収録物識別子タイプ ISSN
収録物識別子 2169-9356
DOI
関連識別子 10.1029/2007JB005557
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