Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
Online ISSN : 1883-8944
Print ISSN : 1884-2399
ISSN-L : 1883-8944
Paper
A STUDY ON TSUNAMI PROPAGATION BY THE 2022 HUNGA TONGA-HUNGA HA’API ERUPTION
Tatsuhiko TOKUTATaro ARIKAWATomohiro TAKAGAWAYu CHIDAAnawat SUPPASRINaotaka CHIKASADANobuhito MORIFumihiko IMAMURA
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2022 Volume 78 Issue 2 Pages I_145-I_150

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Abstract

 On January 15, 2022, a large-scale eruption occurred at the submarine volcano Hunga Tonga-Hunga Ha'apai near the Tonga Islands, and sea-level changes were observed around the world. The sea level fluctuation is assumed to be caused by atmospheric-oceanic resonance due to the Lamb waves and atmospheric gravity waves associated with the eruption. However, the details of the atmospheric pressure fluctuation and propagation process associated with this eruption are still unclear at this time. Therefore, in this study, we examine the effect of atmospheric-oceanic resonance by performing sensitivity analysis for tsunamis propagating from Tonga to Japan by varying the amount of atmospheric pressure variation and propagation velocity of the waves, which are considered as Lamb waves and atmospheric gravity waves. In this event, the amplitude of the wave was amplified by the Proudman resonance, and a significant sea-level change was considered to have occurred at Amami Oshima. Furthermore, Proudman resonance is also assumed to have occurred at multiple locations due to the combination of pressure waves with the same velocity as the phase velocity of the long ocean wave in the passing ocean region.

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© 2022 by Japan Society of Civil Engineers
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