Meteotsunamis: atmospherically induced destructive ocean waves in the tsunami frequency band 気象津波:津波周波数帯で大気に誘発された破壊的な海洋波
14ページ目 We can present a similar paradoxical exampleof a meteorological tsunami being a secondary effect of a volcanic explosion when it is difficult to recognize the actual source of the observed waves. his example is related to the famous global tsunami caused by the Krakatau Volcano (Indonesia) explosion of 27 August 1883 (cf. Murty, 1977;Bryant, 2001). The 1883 Krakatau tsunami was recorded by 35 tide gauges in the Indian, Pacific and Atlantic oceans, including gauges in Le Havre (France), Kodiak Island (Alaska) and San Francisco (California) (cf. Pelinovsky et al., 2005). However, according to a common opinion (cf. Ewing and Press, 1955; Garrett, 1970), tsunami waves recorded at farfield sites originated from coupling between the ocean surface and the explosion-induced atmospheric waves (that circuited the globe three times ? see Murty, 1977) rather than from direct water waves propagated from the source area(Fig. 15). The problem is the mismatch in time between observed and expected tsunami waves: the waves in the Pacific and Atlantic were recorded too early for long ocean waves to arrive at these sites but in good agreement with atmospheric sound waves (U?340 m/s) to arrive (Garrett, 1970). Therefore, the near-field records of the 1883 Krakatau tsunami were apparently related to real surface ocean waves arriving from the source area whereas the records from intermediately located tide gauges included some mixture of directly arriving ocean waves and atmospherically-generated waves. Farfield records were associated purely with atmospheric waves.
From an orthodox point of view, the term “tsunami” cannot even be used for the latter. However, it is much easier to call all these waves “tsunamis”, keeping in mind the actual generation mechanism of these waves. Certainly, we do not consider this example as a major argument; this event was exceptional and most of meteorological tsunamis have nothing to do with any seismic or volcanic activity. Nevertheless, this example clearly indicates the very close relationship between tsunamis and meteotsunamis. 0323地震雷火事名無し(千葉県)2022/01/22(土) 05:37:11.35ID:PWj9HamM>>318 白頭山の巨大噴火の周期は25000年だから、次の時は人類滅んでいるんじゃないかな