Surface-wave relocation and characterization of the October 2023 tsunamigenic seismic unrest near Sofugan volcano, Izu Islands, Japan
Geophysical Research Letters
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Abstract
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.
Suggested Citation
Deane, C., Pesicek, J., Prejean, S., Earle, P.S., Shelly, D.R., Yeck, W.L., 2025, Surface-wave relocation and characterization of the October 2023 tsunamigenic seismic unrest near Sofugan volcano, Izu Islands, Japan: Geophysical Research Letters, v. 52, no. 3, e2024GL113504, 12 p., https://doi.org/10.1029/2024GL113504.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Surface-wave relocation and characterization of the October 2023 tsunamigenic seismic unrest near Sofugan volcano, Izu Islands, Japan |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2024GL113504 |
| Volume | 52 |
| Issue | 3 |
| Publication Date | January 30, 2025 |
| Year Published | 2025 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Geologic Hazards Science Center - Seismology / Geomagnetism |
| Description | e2024GL113504, 12 p. |
| Country | Japan |
| Other Geospatial | Sofugan volcano, Izu Islands |