A further source of Tokyo earthquakes and Pacific Ocean tsunamis
Earthquake hazard assessments for the Tokyo Region are complicated by the trench–trench triple junction where the oceanic Philippine Sea Plate not only underthrusts a continental plate but is also being subducted by the Pacific Plate. Great thrust earthquakes and associated tsunamis are historically...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2024
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| Online Access: | https://hdl.handle.net/10356/174619 |
| _version_ | 1811688275640844288 |
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| author | Pilarczyk, Jessica E. Sawai, Yuki Namegaya, Yuichi Tamura, Toru Tanigawa, Koichiro Matsumoto, Dan Shinozaki, Tetsuya Fujiwara, Osamu Shishikura, Masanobu Shimada, Yumi Dura, Tina Horton, Benjamin Peter Parnell, Andrew C. Vane, Christopher H. |
| author2 | Asian School of the Environment |
| author_facet | Asian School of the Environment Pilarczyk, Jessica E. Sawai, Yuki Namegaya, Yuichi Tamura, Toru Tanigawa, Koichiro Matsumoto, Dan Shinozaki, Tetsuya Fujiwara, Osamu Shishikura, Masanobu Shimada, Yumi Dura, Tina Horton, Benjamin Peter Parnell, Andrew C. Vane, Christopher H. |
| author_sort | Pilarczyk, Jessica E. |
| collection | NTU |
| description | Earthquake hazard assessments for the Tokyo Region are complicated by the trench–trench triple junction where the oceanic Philippine Sea Plate not only underthrusts a continental plate but is also being subducted by the Pacific Plate. Great thrust earthquakes and associated tsunamis are historically recognized hazards from the Continental/Philippine Sea (Sagami Trough) and Continental/Pacific (Japan Trench) plate boundaries but not from the Philippine Sea/Pacific (Izu–Bonin Trench) boundary alone. Here we employed a series of historical and hypothetical rupture models to explain the widespread distribution of geological evidence for an unusually large tsunami found along 50 km of coastline east of Tokyo. Dating to about 1,000 years ago, this inferred tsunami predates local written history by several hundred years. We found that the inland extent of its sand sheet is best explained, in computer simulations, by displacement on one of the three plate boundaries offshore of the Boso Peninsula, which corresponds to the triple junction. The minimum magnitude scenario capable of generating the inland extent of inundation involves displacement along the Philippine Sea/Pacific boundary megathrust. This plate-boundary fault adds another potential source for earthquakes in the Tokyo Region and tsunamis in the Pacific Ocean. |
| first_indexed | 2024-10-01T05:29:37Z |
| format | Journal Article |
| id | ntu-10356/174619 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:29:37Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1746192024-04-18T01:20:55Z A further source of Tokyo earthquakes and Pacific Ocean tsunamis Pilarczyk, Jessica E. Sawai, Yuki Namegaya, Yuichi Tamura, Toru Tanigawa, Koichiro Matsumoto, Dan Shinozaki, Tetsuya Fujiwara, Osamu Shishikura, Masanobu Shimada, Yumi Dura, Tina Horton, Benjamin Peter Parnell, Andrew C. Vane, Christopher H. Asian School of the Environment Earth Observatory of Singapore Earth and Environmental Sciences Earthquake Tsunami Earthquake hazard assessments for the Tokyo Region are complicated by the trench–trench triple junction where the oceanic Philippine Sea Plate not only underthrusts a continental plate but is also being subducted by the Pacific Plate. Great thrust earthquakes and associated tsunamis are historically recognized hazards from the Continental/Philippine Sea (Sagami Trough) and Continental/Pacific (Japan Trench) plate boundaries but not from the Philippine Sea/Pacific (Izu–Bonin Trench) boundary alone. Here we employed a series of historical and hypothetical rupture models to explain the widespread distribution of geological evidence for an unusually large tsunami found along 50 km of coastline east of Tokyo. Dating to about 1,000 years ago, this inferred tsunami predates local written history by several hundred years. We found that the inland extent of its sand sheet is best explained, in computer simulations, by displacement on one of the three plate boundaries offshore of the Boso Peninsula, which corresponds to the triple junction. The minimum magnitude scenario capable of generating the inland extent of inundation involves displacement along the Philippine Sea/Pacific boundary megathrust. This plate-boundary fault adds another potential source for earthquakes in the Tokyo Region and tsunamis in the Pacific Ocean. Ministry of Education (MOE) National Research Foundation (NRF) This work is a contribution to IGCP Project 725, was supported by the Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST) and in part by grants awarded to J.E.P. (National Science Foundation (EAR-1303881 and 1624612), Natural Sciences and Engineering Council of Canada (NSERC), Canada Research Chair (CRC) program and Japan Society for the Promotion of Science (JSPS) International Research Fellows (Geological Survey of Japan, AIST, PE14038)), A.C.P. (Science Foundation Ireland Career Development Award (17/CDA/4695), Investigator Award (16/IA/4520), Marine Research Programme funded by the Irish Government, co-financed by the European Regional Development Fund (Grant-Aid Agreement no. PBA/CC/18/01), European Union’s Horizon 2020 research and innovation programme under grant agreement no. 818144 and SFI Research Centre (16/RC/3872 and 12/RC/2289_P2)) and B.P.H. (Singapore Ministry of Education Academic Research Fund (MOE2019-T3-1-004), National Research Foundation Singapore and Singapore Ministry of Education, under the Research Centers of Excellence initiative). This work is Earth Observatory of Singapore contribution 382. 2024-04-18T01:20:55Z 2024-04-18T01:20:55Z 2021 Journal Article Pilarczyk, J. E., Sawai, Y., Namegaya, Y., Tamura, T., Tanigawa, K., Matsumoto, D., Shinozaki, T., Fujiwara, O., Shishikura, M., Shimada, Y., Dura, T., Horton, B. P., Parnell, A. C. & Vane, C. H. (2021). A further source of Tokyo earthquakes and Pacific Ocean tsunamis. Nature Geoscience, 14, 796-800. https://dx.doi.org/10.1038/s41561-021-00812-2 1752-0894 https://hdl.handle.net/10356/174619 10.1038/s41561-021-00812-2 14 796 800 en MOE 2019-T3-1-004 EAR-1303881 EAR-1624612 PE14038 17/CDA/4695 16/IA/4520 PBA/CC/18/01 16/RC/3872 12/RC/2289_P2 Nature Geoscience © 2021 The Author(s), under exclusive licence to Springer Nature Limited. All rights reserved. |
| spellingShingle | Earth and Environmental Sciences Earthquake Tsunami Pilarczyk, Jessica E. Sawai, Yuki Namegaya, Yuichi Tamura, Toru Tanigawa, Koichiro Matsumoto, Dan Shinozaki, Tetsuya Fujiwara, Osamu Shishikura, Masanobu Shimada, Yumi Dura, Tina Horton, Benjamin Peter Parnell, Andrew C. Vane, Christopher H. A further source of Tokyo earthquakes and Pacific Ocean tsunamis |
| title | A further source of Tokyo earthquakes and Pacific Ocean tsunamis |
| title_full | A further source of Tokyo earthquakes and Pacific Ocean tsunamis |
| title_fullStr | A further source of Tokyo earthquakes and Pacific Ocean tsunamis |
| title_full_unstemmed | A further source of Tokyo earthquakes and Pacific Ocean tsunamis |
| title_short | A further source of Tokyo earthquakes and Pacific Ocean tsunamis |
| title_sort | further source of tokyo earthquakes and pacific ocean tsunamis |
| topic | Earth and Environmental Sciences Earthquake Tsunami |
| url | https://hdl.handle.net/10356/174619 |
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