TSUNAMI OBSERVATION RESULTS IN TOHOKU PACIFIC AREA CAUSED BY HUNGA TONGA-HUNGA HA’APAI VOLCANO IN JANUARY 2022

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  • 2022年トンガ国海底火山噴火による東北太平洋沿岸での潮位変動の観測結果

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<p> On January 15, 2022, a large-scale eruption occurred at a submarine volcano (Hunga Tonga-Hunga Ha'apai Volcano) in Tonga. This paper is a preliminary report of the water level fluctuations observed along the Pacific coast of Tohoku-area in Japan due to the eruption of this volcano. Tsunami analysis was conducted using the water level profiles at the tide gauges, seabed wave meters and GPS-mounted buoys of NOWPHAS. The maximum tsunami anomaly varied greatly from location to location, with the largest anomaly being 105.9 cm at the Kuji tide gauge. The East Aomori and North Iwate GPS-mounted buoys recorded an air pressure fluctuation of about 2 hPa at 20:40 on January 15. The tidal anomaly occurred after the air pressure fluctuation, suggesting that the recent tsunami was caused by the air wave. However, the mechanisms of the occurrences were unclear, such as the large tsunami height relative to the air pressure fluctuation, and these subjects remain as future issues.</p>

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