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The Sofu Seamount Submarine Volcano Present in the Source Area of the October 2023 Earthquakes and Tsunamis in Japan
Geophysical Research Letters ( IF 4.6 ) 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
Geophysical Research Letters ( IF 4.6 ) 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
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.
更新日期：2024-10-01
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