Ocean gravity waves generated by the meteotsunami at the Japan Trench following the 2022 Tonga volcanic eruption

Earth, Planets and Space

Express Letter

Tung-Cheng Ho¹  Masumi Yamada¹  Nobuhito Mori¹ 

[1] Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan;

关键词: Tonga;    Tsunami;    S-net;    Pressure wave;    Meteotsunami;    Wave split;    Wave separation;    Volcano;    Wave deformation;    Gravity wave;   

DOI  :  10.1186/s40623-023-01775-x

 received in 2022-12-22, accepted in 2023-01-19,  发布年份 2023

来源: Springer

【 摘 要 】

The 2022 eruption of the Hunga Tonga-Hunga Ha'apai volcano excited an atmospheric Lamb wave, which induced a fast-traveling tsunami. This tsunami was driven by the pressure-forced wave traveling at the speed of the Lamb wave and, thus, was much faster than conventional tsunamis. This was the first case in which ocean bottom monitoring systems widely observed an air pressure-induced tsunami. We found that the pressure-forced waves split and generated ocean gravity waves after passing the Japan Trench based on the S-net data. Our simulations show that changes in water depth can amplify or decrease the pressure-forced wave. Simultaneously, an ocean gravity wave is generated due to the conservation of water volume. Because the ocean gravity wave was slower than the pressure-forced wave near Japan, it was separated from, and traveled behind, the pressure-forced wave. We explained the wave separation phenomenon and reproduced the waveforms of different splitting stages observed by the stations near the Japan Trench.Graphical Abstract

【 授权许可】

CC BY   
© The Author(s) 2023

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