The Sofu Seamount Submarine Volcano Present in the Source Area of the October 2023 Earthquakes and Tsunamis in Japan

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2024-10-01 DOI:10.1029/2024GL109766

Toshiya Fujiwara, Kentaro Imai, Masayuki Obayashi, Kenta Yoshida, Noriko Tada, Koichiro Obana, Gou Fujie, Shigeaki Ono, Shuichi Kodaira

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Abstract

On 8 October 2023 (UTC), unique earthquakes occurred in the Izu-Ogasawara Arc, Japan, in which the P- and S-phases were barely visible and only the T-phases were evident, followed by tsunamis that reached islands in the Izu-Ogasawara Arc and a wide area of the Pacific coast of southwest Japan. Our estimated T-phase source area coincides with the Sofu Seamount, which was previously unrecognized as an active submarine volcano. A bathymetric survey of the seamount conducted 1 month after the event revealed characteristics of the seamount with a caldera and a central cone. Compared to the bathymetry in 1987, the topography in the caldera had changed significantly such as a crater forming in the central cone. This seamount is likely to be an active volcano. The topographic changes on the caldera-sized scale that occurred at the caldera can be explained as a source of the October tsunami.

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出现在 2023 年 10 月日本地震和海啸源区的索孚海山海底火山

2023 年 10 月 8 日（世界协调时），日本伊豆-小笠原弧地区发生了独特的地震，其中几乎看不到 P 相和 S 相，只有 T 相明显，随后海啸波及伊豆-小笠原弧地区的岛屿和日本西南部太平洋沿岸的广大地区。我们估算的 T 相海啸源区域与索夫海山相吻合，而索夫海山以前从未被确认为海底活火山。事件发生 1 个月后对该海山进行的水深测量显示，该海山具有破火山口和中心锥体的特征。与 1987 年的水深测量相比，破火山口的地形发生了显著变化，如中心锥体形成了一个火山口。这座海山很可能是一座活火山。火山口发生的火山口规模的地形变化可以解释为 10 月海啸的来源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.