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  1. D300 大学院環境学研究科
  2. D300a 雑誌掲載論文
  3. 学術雑誌

Comparison of high- and low-frequency signal sources for very-long-period seismic events at Asama volcano, Japan

http://hdl.handle.net/2237/00030689
http://hdl.handle.net/2237/00030689
7800fd82-96d1-4564-a6e0-8e278998c229
名前 / ファイル ライセンス アクション
ggz021.pdf ggz021 (6.8 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2019-09-17
タイトル
タイトル Comparison of high- and low-frequency signal sources for very-long-period seismic events at Asama volcano, Japan
言語 en
著者 Maeda, Yuta

× Maeda, Yuta

WEKO 93470

en Maeda, Yuta

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Takeo, Minoru

× Takeo, Minoru

WEKO 93471

en Takeo, Minoru

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Kazahaya, Ryunosuke

× Kazahaya, Ryunosuke

WEKO 93472

en Kazahaya, Ryunosuke

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 Copyright © 2019 The Royal Astronomical Society
キーワード
主題Scheme Other
主題 Earthquake source observations
キーワード
主題Scheme Other
主題 Volcano seismology
キーワード
主題Scheme Other
主題 Eruption mechanisms and flow emplacement
キーワード
主題Scheme Other
主題 Explosive volcanism
キーワード
主題Scheme Other
主題 Volcano monitoring
抄録
内容記述タイプ Abstract
内容記述 Very-long-period (VLP) seismic events at Asama volcano in central Japan are characterized by a transient signal of 10–20 s duration. Associated with the transient motion, a high-frequency (HF) oscillation within the 5–10 Hz band is observed. We investigated the location and size of the oscillation source in the HF band (HF source) using an amplitude source location method and compared our results with those for the VLP band (VLP source) deduced in our previous waveform inversion study. We analysed 1437 VLP events recorded during an intense observation campaign during 2008–2009, and additional 571 events surrounding an eruptive activity in 2015 (including a VLP event that immediately preceded an eruption). The HF source locations of most events were deeper than the VLP source locations by ∼150 m, although there was almost no time lag between the signals. This suggests a strong connection between the two sources, with one source immediately responding to the other. The eruptive VLP event had an HF source location close to normal VLP events but had a greater event size. We surmise that the HF signal is caused by an inflow of volcanic gas from depth into a semi-vertical crack-like cavity (as imaged in our previous waveform inversion study), and the VLP signal is caused by resultant inflation of the same cavity. The centroid of inflation (VLP source) is near the roof of the cavity, where gas accumulates, whereas the HF oscillation is emitted more intensely from lower and narrower portions of the cavity. This results in source depth differences between the two signal bands. In this model, the inflation rate of the cavity is controlled by the volume flux of the gas inflow, producing similar temporal variations between the VLP and HF signals. According to this model, the eruptive VLP is associated with a greater amount of gas inflow and accumulation, which likely played a key role in the eruption.
言語 en
出版者
出版者 Oxford University Press
言語 en
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ AM
出版タイプResource http://purl.org/coar/version/c_ab4af688f83e57aa
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1093/gji/ggz021
ISSN(print)
収録物識別子タイプ PISSN
収録物識別子 0956-540X
書誌情報 en : Geophysical Journal International

巻 217, 号 1, p. 389-404, 発行日 2019-04
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