Japan Geoscience Union Meeting 2024

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[J] Oral

S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG54] Volcanoes in the sea

Fri. May 31, 2024 1:45 PM - 3:00 PM 301B (International Conference Hall, Makuhari Messe)

convener:Yoshihiko Tamura(Research Institute for Marine Geodynamics, Japan Agency for Maine-Earth Science and Technology), Eisuke Fujita(National research Instituite for Earth science and Disaster Resilience, Volcanic research department), Fukashi Maeno(Earthquake Research Institute, University of Tokyo), Shigeaki Ono(Japan Agency for Marine-Earth Science and Technology), Chairperson:Yoshihiko Tamura(Research Institute for Marine Geodynamics, Japan Agency for Maine-Earth Science and Technology), Shigeaki Ono(Japan Agency for Marine-Earth Science and Technology), Fukashi Maeno(Earthquake Research Institute, University of Tokyo), Eisuke Fujita(National research Instituite for Earth science and Disaster Resilience, Volcanic research department)

2:30 PM - 2:45 PM

[SCG54-14] Back-tracking drift simulation of pumice found near Torishima on October 20, 2023

*Tatsu Kuwatani1, Haruka Nishikawa1, Yusuke Tanaka1,2, Hiromi Kayama WATANABE1, Noriko Tada1, Shigeaki Ono1 (1.Japan Agency for Marine-Earth Science and Technology, 2.Ocean Eyes Co., Ltd.)

Keywords:pumice, submarine volcano, Torishima

In October, 2023, seismic activity was intensified near Torishima in the Izu Islands, with an earthquake accompanied by a tsunami occurring on October 9, observed in the Izu Islands and along the Pacific coast. On October 20, an aerial survey by the Japan Coast Guard confirmed the distribution of floating pumice in the western waters near Torishima. This study conducted a back-tracking drift simulation using ocean current data to identify the origin of the drifting pumice. The simulation results suggest that the pumice drifted southward from near back-arc rifting area in the waters west of Sumisujima Island and Myojinsho Reef, carried by currents branching from the Kuroshio main current. This suggests that the origin is not related to the earthquake and tsunami event on October 9. The simulation results are consistent with the petrological characteristics and biological features of the pumice samples collected later in the same area by the Japan Meteorological Agency's research vessel, as well as the results of geochemical analysis. We will discuss the analysis results, the origin of the pumice, and the effectiveness of back-tracking simulation.