2023年10月日本伊豆岛索富根火山附近海啸性地震动荡的表面波重新定位和特征

IF 4.6 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
C. A. Deane, J. D. Pesicek, S. G. Prejean, P. S. Earle, D. R. Shelly, W. L. Yeck
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引用次数: 0

摘要

2023年10月1日至8日,日本偏远的伊豆群岛地区发生了一次中等规模的地震群。这群地震包括美国地质调查局记录的151次浅层地震,其中值得注意的是,其中包括一次大约2.5小时的15级连续地震(M) <;5.5地震。起源时间与区域记录的海啸波一致,但中等震级地震的海啸成因并不常见,这表明火山活动产生了海洋位移。利用表面波相对重定位方法,我们估计了远程群的精确震中位置。最终的震中中心和破火山口类似物表明了一个三阶段模型来解释群活动:(a)岩浆侵入造成的破火山口增压,(b)通过岩脉向远离破火山口的方向扩展造成的减压,以及(c)火山爆发与崩塌或额外侵入引起的破火山口重新激活相对应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Surface-Wave Relocation and Characterization of the October 2023 Tsunamigenic Seismic Unrest Near Sofugan Volcano, Izu Islands, Japan

Surface-Wave Relocation and Characterization of the October 2023 Tsunamigenic Seismic Unrest Near Sofugan Volcano, Izu Islands, Japan

Surface-Wave Relocation and Characterization of the October 2023 Tsunamigenic Seismic Unrest Near Sofugan Volcano, Izu Islands, Japan

Surface-Wave Relocation and Characterization of the October 2023 Tsunamigenic Seismic Unrest Near Sofugan Volcano, Izu Islands, Japan

Surface-Wave Relocation and Characterization of the October 2023 Tsunamigenic Seismic Unrest Near Sofugan Volcano, Izu Islands, Japan

A moderate-magnitude earthquake swarm occurred in the remote Izu Islands region of Japan between October 1 and 8, 2023. The swarm included 151 shallow earthquakes cataloged by the U.S. Geological Survey, which notably included a roughly 2.5-hr episode of 15 successive magnitude (M) < 5.5 earthquakes. Origin times were coincident with regionally recorded tsunami waves, but tsunamigenesis for moderate-magnitude earthquakes is uncommon, indicating that volcanic activity generated the ocean displacements. Leveraging a surface-wave relative relocation approach, we estimate precise epicentroid locations for the remote swarm. Final epicentroids and caldera analogs indicate a three-stage model to explain swarm activity: (a) caldera pressurization due to magma intrusion, (b) depressurization via dike propagation away from the caldera, and (c) eruption corresponding with caldera reactivation either by collapse or additional intrusion.

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来源期刊
Geophysical Research Letters
Geophysical Research Letters 地学-地球科学综合
CiteScore
9.00
自引率
9.60%
发文量
1588
审稿时长
2.2 months
期刊介绍: Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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