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タイトル: | 総合報告: 大地震、津波、火山大爆発などから発生した気圧波 |
その他のタイトル: | Atmospheric Pressure Waves Generated from Large Earthquakes, Tsunamis and Large Volcanic Eruptions |
著者: | 三雲, 健 |
著者名の別形: | Mikumo, Takeshi |
キーワード: | Atmospheric pressure waves Low-frequency acoustic-gravity waves High-frequency infrasounds Large earthquakes and volcanic eruptions |
発行日: | 2011 |
出版者: | 日本地震学会 |
誌名: | 地震 第2輯 |
巻: | 64 |
号: | 2 |
開始ページ: | 47 |
終了ページ: | 62 |
抄録: | This report reviews various studies on atmospheric pressure waves that have been generated from large earthquakes, tsunamis, and large-scale volcanic eruptions. These waves described here include low-frequency acoustic and gravity waves (0.0008∼0.0166 Hz or its period 1∼20 min) and high to medium frequency (› 0.0166 Hz or its period ‹ 1 min) infrasonic air-waves. The low-frequency acoustic-gravity waves came from coseismic vertical ground deformation associated with two megathrust earthquakes, and sometimes from other large earthquakes and volcanic eruptions, which propagated to more than several thousand kilometers through the lower to part of the upper atmosphere. The waves that reached the upper atmosphere could cause traveling ionospheric disturbances and perturbations of total electron content. The higher frequency infrasounds also have often been observed after large earthquakes and volcanic eruptions, which traveled as air-waves propagating directly from the source, and also as air-waves coupled with traveling seismic Rayleigh waves. Small atmospheric perturbations have also been detected during propagation of tsunami waves caused secondarily by large submarine earthquakes. Theoretical waveform modeling has been made in some of the above cases, incorporating a realistic atmospheric temperature structure. It is expected that more detailed information about the source process of large earthquakes and volcanic eruptions could be extracted through the analysis of the waveforms recorded at a number of stations, including their maximum amplitudes, wave frequencies, duration times, directions of wave approach, and phase and group velocities. |
著作権等: | © 日本地震学会 |
URI: | http://hdl.handle.net/2433/193429 |
DOI(出版社版): | 10.4294/zisin.64.47 |
出現コレクション: | 三雲 健 |
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