Ancient Tsunami Records in the Viscous Remanent Magnetization of Reworked Boulders in the Kingdom of Tonga
Abstract The movement history of boulders is crucial for the reconstruction of paleo‐tsunamis. We report findings from viscous remanent magnetization studies of the boulders on Tongatapu Island, aiming to reconstruct their reworkings. Two boulders exhibited viscous remanence, whereas two larger boul...
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| Format: | Article |
| Language: | English |
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Wiley
2024-11-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL110932 |
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| author | Tetsuro Sato Norihiro Nakamura Masahiko Sato Chie Kato Kazuhisa Goto Masashi Watanabe Kenji Satake Taaniela Kula |
| author_facet | Tetsuro Sato Norihiro Nakamura Masahiko Sato Chie Kato Kazuhisa Goto Masashi Watanabe Kenji Satake Taaniela Kula |
| author_sort | Tetsuro Sato |
| collection | DOAJ |
| description | Abstract The movement history of boulders is crucial for the reconstruction of paleo‐tsunamis. We report findings from viscous remanent magnetization studies of the boulders on Tongatapu Island, aiming to reconstruct their reworkings. Two boulders exhibited viscous remanence, whereas two larger boulders lacked viscous components but exhibited stable remanence. Both the viscous and stable components deviated from the geomagnetic field direction. These observations indicate that: (a) the boulders with a viscous component were reworked before the latest event, which could have reworked all boulders, and (b) the magnitude of the latest event was larger than that of an earlier event. The reworked timing indicated that the event occurred between 3,000 years ago and the fifteenth century. The difference in the wave height required to move boulders on the eastern and western coasts suggests that the source of the earlier tsunami was likely an eruption due to volcanoes along the Tonga Ridge. |
| format | Article |
| id | doaj-art-9071be938ccf4dfc86b175c863ddfdd9 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-9071be938ccf4dfc86b175c863ddfdd92025-08-20T03:02:07ZengWileyGeophysical Research Letters0094-82761944-80072024-11-015121n/an/a10.1029/2024GL110932Ancient Tsunami Records in the Viscous Remanent Magnetization of Reworked Boulders in the Kingdom of TongaTetsuro Sato0Norihiro Nakamura1Masahiko Sato2Chie Kato3Kazuhisa Goto4Masashi Watanabe5Kenji Satake6Taaniela Kula7Department of Earth Science School of Education Waseda University Tokyo JapanInstitute for Excellence in Higher Education Tohoku University Miyagi JapanDepartment of Earth and Planetary Science The University of Tokyo Tokyo JapanFaculty of Social and Cultural Studies Kyushu University Fukuoka JapanDepartment of Earth and Planetary Science The University of Tokyo Tokyo JapanEarth Observatory of Singapore Nanyang Technological University Jurong SingaporeEarthquake Research Institute The University of Tokyo Tokyo JapanTonga Geological Services Ministry of Lands and Natural Resources Nuku'alofa TongaAbstract The movement history of boulders is crucial for the reconstruction of paleo‐tsunamis. We report findings from viscous remanent magnetization studies of the boulders on Tongatapu Island, aiming to reconstruct their reworkings. Two boulders exhibited viscous remanence, whereas two larger boulders lacked viscous components but exhibited stable remanence. Both the viscous and stable components deviated from the geomagnetic field direction. These observations indicate that: (a) the boulders with a viscous component were reworked before the latest event, which could have reworked all boulders, and (b) the magnitude of the latest event was larger than that of an earlier event. The reworked timing indicated that the event occurred between 3,000 years ago and the fifteenth century. The difference in the wave height required to move boulders on the eastern and western coasts suggests that the source of the earlier tsunami was likely an eruption due to volcanoes along the Tonga Ridge.https://doi.org/10.1029/2024GL110932tsunami boulderviscous remanent magnetizationpaleotsunamireworking historytsunami magnitudetongatapu island |
| spellingShingle | Tetsuro Sato Norihiro Nakamura Masahiko Sato Chie Kato Kazuhisa Goto Masashi Watanabe Kenji Satake Taaniela Kula Ancient Tsunami Records in the Viscous Remanent Magnetization of Reworked Boulders in the Kingdom of Tonga Geophysical Research Letters tsunami boulder viscous remanent magnetization paleotsunami reworking history tsunami magnitude tongatapu island |
| title | Ancient Tsunami Records in the Viscous Remanent Magnetization of Reworked Boulders in the Kingdom of Tonga |
| title_full | Ancient Tsunami Records in the Viscous Remanent Magnetization of Reworked Boulders in the Kingdom of Tonga |
| title_fullStr | Ancient Tsunami Records in the Viscous Remanent Magnetization of Reworked Boulders in the Kingdom of Tonga |
| title_full_unstemmed | Ancient Tsunami Records in the Viscous Remanent Magnetization of Reworked Boulders in the Kingdom of Tonga |
| title_short | Ancient Tsunami Records in the Viscous Remanent Magnetization of Reworked Boulders in the Kingdom of Tonga |
| title_sort | ancient tsunami records in the viscous remanent magnetization of reworked boulders in the kingdom of tonga |
| topic | tsunami boulder viscous remanent magnetization paleotsunami reworking history tsunami magnitude tongatapu island |
| url | https://doi.org/10.1029/2024GL110932 |
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