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タイトル: | Tsunami Triggered by the Lamb Wave From the 2022 Tonga Volcanic Eruption and Transition in the Offshore Japan Region |
著者: | Yamada, Masumi Ho, Tung‐Cheng Mori, Jim Nishikawa, Yasuhiro Yamamoto, Masa‐Yuki |
著者名の別形: | 山田, 真澄 |
キーワード: | Hunga Tonga-Hunga Ha'apai tsunami volcanic erruption Lamb wave atmospheric pressure shock wave |
発行日: | 16-Aug-2022 |
出版者: | American Geophysical Union (AGU) |
誌名: | Geophysical Research Letters |
巻: | 49 |
号: | 15 |
論文番号: | e2022GL098752 |
抄録: | The 2022 volcanic eruption in Tonga caused an unusually large tsunami around the Pacific. It travels with a faster apparent velocity and has larger amplitudes at long distances than what would be expected from a conventional tsunami from the volcanic source. This tsunami was generated by the moving atmospheric Lamb wave and traveled at the speed of the Lamb wave (0.31 km/s). Japanese data showed the amplitude of this first tsunami becomes small when approaching the coast, due to the weaker air-sea coupling at the shallow depth. This wave split when passing the continental slope, and traveled at the speed of the ocean gravity wave. Therefore, the tsunami observed at the coast is delayed by thousands of seconds from the passage of the Lamb wave. Tsunamis generated by this atmospheric mechanism have not been previously observed by modern digital recording systems and should be considered in the tsunami warning systems. |
著作権等: | © 2022. American Geophysical Union. All Rights Reserved. The full-text file will be made open to the public on 11 February 2023 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. |
URI: | http://hdl.handle.net/2433/283110 |
DOI(出版社版): | 10.1029/2022gl098752 |
出現コレクション: | 学術雑誌掲載論文等 |
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