On Tsunami Waves Induced by Atmospheric Pressure Shock Waves After the 2022 Hunga Tonga-Hunga Ha'apai Volcano Eruption

Zhiyuan Ren, Pablo Higuera, Philip Li-Fan Liu

研究成果: Article同行評審

16 引文 斯高帕斯(Scopus)

摘要

Employing a linear shallow water equation (LSWE) model in the spherical coordinates, this paper investigates the tsunami waves generated by the atmospheric pressure shock waves due to the explosion of the submarine volcano Hunga Tonga–Hunga Ha'apai on 15 January 2022. Using the selected 59 atmospheric pressure records in the Pacific Ocean, an empirical atmospheric pressure model is first constructed. Applying the atmospheric pressure model and realistic bathymetric data in the LSWE model, tsunami generation and propagation are simulated in the Pacific Ocean. The numerical results show clearly the co-existence of the leading locked waves, propagating with the speed of the atmospheric pressure waves (∼1,100 km/hr), and the trailing free waves, propagating with long gravity ocean wave celerity (∼750 km/hr). During the event, tsunamis were reported by 41 Deep-ocean Assessment and Reporting of Tsunamis (DART) buoys in the Pacific Ocean, which require corrections because of the occurrence of atmospheric pressure waves. The numerically simulated tsunami arrival time and the amplitudes of the wave crest and trough of the leading locked waves compare reasonably well with the corrected DART measurements. The comparisons for the trailing waves are less satisfactory, since free waves could also have been generated by other tsunami generation mechanisms, which have not been considered in the present model, and by the scattering of locked waves over changing bathymetry. In this regard, the numerical results show clearly that the deep Tonga trench (∼10 km) amplifies the trailing waves in the Southeast part of the Pacific Ocean via the Proudman resonance condition.

原文English
文章編號e2022JC019166
期刊Journal of Geophysical Research: Oceans
128
發行號4
DOIs
出版狀態Published - 2023 4月

All Science Journal Classification (ASJC) codes

  • 地球化學與岩石學
  • 地球物理
  • 海洋學
  • 空間與行星科學
  • 地球與行星科學(雜項)

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