The Airy phase of shallow-focus submarine earthquakes
The Airy phase of shallow-focus submarine earthquakes
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DOI：
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发表时间：
1950-04
影响因子：
3
通讯作者：
F. Press;M. Ewing;I. Tolstoy
中科院分区：
文献类型：
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作者：
F. Press;M. Ewing;I. Tolstoy
Lamb和Pekeris的理论工作的扩展表明，由一组周期为9-11秒的波组成的突出相位（Airy相位），以大约0.7的声速在水中穿过海洋，应该出现在浅源海底地震的地震图上。这种到达对应于通过由海洋和刚性海底组成的声学系统的群速度的固定值处的简正波传播。在百慕大的米尔恩-肖仪器上观察到一系列多米尼加共和国地震的相位符合这一描述。万卡约的温纳地震仪记录到了加拉帕戈斯群岛西南部地震的艾里相。对足够数量的海震的艾里相的研究将提供有关海底性质的信息，因为海底影响艾里相的周期和速度。
An extension of the theoretical work of Lamb and Pekeris shows that a prominent phase (Airy phase) consisting of a group of waves of period 9-11 seconds, traveling across the ocean with a velocity of approximately 0.7 of the speed of sound in water, should be present on the seismograms of shallow-focus submarine earthquakes. This arrival corresponds to normal mode propagation at a stationary value of group velocity through the acoustic system consisting of the ocean and the rigid ocean bottom. A phase fitting this description has been observed on the Milne-Shaw instruments at Bermuda for a series of Dominican Republic shocks. The Wenner seismographs at Huancayo recorded the Airy phase of a shock southwest of the Galapagos Islands. The study of the Airy phase of a sufficient number of sea quakes would provide information concerning the nature of the ocean bottom since the latter affects both the periods and velocities of the Airy phase.