GROUND-COUPLED AIR WAVES FROM GREAT ALASKAN EARTHQUAKE
GROUND-COUPLED AIR WAVES FROM GREAT ALASKAN EARTHQUAKE
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DOI：
10.1029/jz069i024p05357
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发表时间：
1964-01-01
影响因子：
--
通讯作者：
POSMENTIER, ES
中科院分区：
文献类型：
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作者：
DONN, WL;POSMENTIER, ES
1964年3月27日阿拉斯加地震后，在许多地方记录到了与地震波到达同时发生的微气压波动。结果表明，在帕利塞兹，纽约，伯克利，加州，檀香山，夏威夷，压力波产生的垂直地面运动与当地的瑞利波到达震中。群速度频散曲线典型的瑞利波模式的大陆和海洋的路径，分别从空气波从前两个地方。海洋和大陆瑞利模式表示伯克利。稍后的一列波到达的时间正好适合声波直接从震中穿过大气层。虽然让人想起大型爆炸产生的声波，但它们在大范围的垂直地面位移上产生，使它们的研究变得复杂。
Micropressure fluctuations occurring at the same time as the arrival of seismic waves were recorded at many localities following the Alaskan earthquake of March 27, 1964. It is shown that at Palisades, New York, Berkeley, California, and Honolulu, Hawaii, the pressure waves were produced by vertical ground motion associated with local Rayleigh waves arriving from the epicenter. Group velocity dispersion curves typical of Rayleigh wave modes for continental and oceanic paths, respectively, are developed from the air waves from the first two localities. Both oceanic and continental Rayleigh modes are indicated for Berkeley. A later train of waves arrived at a time appropriate for acoustic travel through the atmosphere directly from the epicenter. Although reminiscent of acoustic waves from large explosions, their generation over the large region of vertical ground displacement complicates their study.