Enigmatic Tsunami Waves Amplified by Repetitive Source Events Near Sofugan Volcano, Japan
Abstract On 8 October 2023, mysterious tsunamis with a maximum wave height of 60 cm were observed in Izu Islands and southwestern Japan, although only seismic events with body‐wave magnitudes mb 4–5 have been documented to the west of Sofugan volcano. To investigate the source process, we analyze ts...
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| Format: | Article |
| Language: | English |
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Wiley
2024-01-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2023GL106949 |
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| author | Osamu Sandanbata Kenji Satake Shunsuke Takemura Shingo Watada Takuto Maeda Tatsuya Kubota |
| author_facet | Osamu Sandanbata Kenji Satake Shunsuke Takemura Shingo Watada Takuto Maeda Tatsuya Kubota |
| author_sort | Osamu Sandanbata |
| collection | DOAJ |
| description | Abstract On 8 October 2023, mysterious tsunamis with a maximum wave height of 60 cm were observed in Izu Islands and southwestern Japan, although only seismic events with body‐wave magnitudes mb 4–5 have been documented to the west of Sofugan volcano. To investigate the source process, we analyze tsunami waveforms recorded by an array network of ocean bottom pressure gauges. Stacked waveforms of pressure gauge records suggest recurrent arrivals of multiple wave trains. Deconvolution of the stacked waveforms by tsunami waveforms from an earlier event revealed over 10 source events that intermittently generated tsunamis for ∼1.5 hr. The temporal history of this sequence corresponds to the origin times of T‐phases estimated by an ocean bottom seismometer and of the seismic swarm, implying a common origin. Larger events later in the sequence occurred at intervals comparable to the tsunami wave period, causing amplification of later phases of the tsunami waves. |
| format | Article |
| id | doaj-art-a2f129fa10b146dd82e8b513d1ba2aaf |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-a2f129fa10b146dd82e8b513d1ba2aaf2025-08-20T03:11:03ZengWileyGeophysical Research Letters0094-82761944-80072024-01-01512n/an/a10.1029/2023GL106949Enigmatic Tsunami Waves Amplified by Repetitive Source Events Near Sofugan Volcano, JapanOsamu Sandanbata0Kenji Satake1Shunsuke Takemura2Shingo Watada3Takuto Maeda4Tatsuya Kubota5Earthquake Research Institute The University of Tokyo Tokyo JapanEarthquake Research Institute The University of Tokyo Tokyo JapanEarthquake Research Institute The University of Tokyo Tokyo JapanEarthquake Research Institute The University of Tokyo Tokyo JapanGraduate School of Science and Technology Hirosaki University Aomori JapanNational Research Institute for Earth Science and Disaster Resilience Ibaraki JapanAbstract On 8 October 2023, mysterious tsunamis with a maximum wave height of 60 cm were observed in Izu Islands and southwestern Japan, although only seismic events with body‐wave magnitudes mb 4–5 have been documented to the west of Sofugan volcano. To investigate the source process, we analyze tsunami waveforms recorded by an array network of ocean bottom pressure gauges. Stacked waveforms of pressure gauge records suggest recurrent arrivals of multiple wave trains. Deconvolution of the stacked waveforms by tsunami waveforms from an earlier event revealed over 10 source events that intermittently generated tsunamis for ∼1.5 hr. The temporal history of this sequence corresponds to the origin times of T‐phases estimated by an ocean bottom seismometer and of the seismic swarm, implying a common origin. Larger events later in the sequence occurred at intervals comparable to the tsunami wave period, causing amplification of later phases of the tsunami waves.https://doi.org/10.1029/2023GL106949tsunamitsunami earthquakesT‐phaseseismic wavesvolcanic tsunami |
| spellingShingle | Osamu Sandanbata Kenji Satake Shunsuke Takemura Shingo Watada Takuto Maeda Tatsuya Kubota Enigmatic Tsunami Waves Amplified by Repetitive Source Events Near Sofugan Volcano, Japan Geophysical Research Letters tsunami tsunami earthquakes T‐phase seismic waves volcanic tsunami |
| title | Enigmatic Tsunami Waves Amplified by Repetitive Source Events Near Sofugan Volcano, Japan |
| title_full | Enigmatic Tsunami Waves Amplified by Repetitive Source Events Near Sofugan Volcano, Japan |
| title_fullStr | Enigmatic Tsunami Waves Amplified by Repetitive Source Events Near Sofugan Volcano, Japan |
| title_full_unstemmed | Enigmatic Tsunami Waves Amplified by Repetitive Source Events Near Sofugan Volcano, Japan |
| title_short | Enigmatic Tsunami Waves Amplified by Repetitive Source Events Near Sofugan Volcano, Japan |
| title_sort | enigmatic tsunami waves amplified by repetitive source events near sofugan volcano japan |
| topic | tsunami tsunami earthquakes T‐phase seismic waves volcanic tsunami |
| url | https://doi.org/10.1029/2023GL106949 |
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