| Seismic moment tensor representations and radiation patterns in unbounded media with elipsoidal cavities driven by low frequency pressure |
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| 作者姓名： | 靳平 徐果明 楼为涛 |
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| 作者单位： | PING JIN 1) GUO MING XU 1) WEI TAO LOU 2) 1) Department of Earth and Space Sciences，University of Science and Technology of China，Hefei 230026，China 2) Northwest Institute of Nuclear Technology，Xi′an 710024，China |
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| 摘 要： | ＳｅｉｓｍｉｃｍｏｍｅｎｔｔｅｎｓｏｒｒｅｐｒｅｓｅｎｔａｔｉｏｎｓａｎｄｒａｄｉａｔｉｏｎｐａｔｅｒｎｓｉｎｕｎｂｏｕｎｄｅｄｍｅｄｉａｗｉｔｈｅｌｉｐｓｏｉｄａｌｃａｖｉｔｉｅｓｄｒｉｖｅｎｂｙｌｏｗｆｒｅｑｕｅｎｃｙｐｒｅｓｓｕｒｅＰＩ...
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| 收稿时间： | 5 June 1996 |
| 修稿时间： | 4 April 1997 |
Seismic moment tensor representations and radiation patterns in unbounded media with ellipsoidal cavities driven by low frequency pressure |
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| Ping Jin, Guo-Ming Xu and Wei-Tao Lou.Seismic moment tensor representations and radiation patterns in unbounded media with elipsoidal cavities driven by low frequency pressure[J].Acta Seismologica Sinica(English Edition),1997,10(5):553-564. |
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| Authors: | Ping Jin Guo-Ming Xu and Wei-Tao Lou |
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| Institution: | (1) Department of Earth and Space Sciences, University of Science and Technology of China, 230026 Hefei, China;(2) Northwest Institute of Nuclear Technology, 710024 Xi’an, China |
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| Abstract: | Seismic waves generated in elastic media by ellipsoidal cavities driven by low frequency pressure can be solved by Eshelby’s
method. In this paper we prove that this method, originally presented for elastostatic ellipsoidal inclusion problems, can
also be applied to dynamic problems on the assumption that wavelengths are much longer than the dimensions of cavities. Comparison
between the approximate solution for spherical cavities and its relevant precise solution shows that this method may be used
for radii of cavities smaller than 100 m and for frequencies below 10 Hz. By this approach we show that, for low frequency
seismic waves in the far-field an explosive load on an ellipsoidal cavity can be equivalent to three dipoles oriented along
the principal axes of that cavity. Seismic radiation patterns are given analytically and results thus obtained show that an
explosion detonated in an ellipsoidal cavity may radiate significant S waves. |
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| Keywords: | ellipsoidal cavity explosive source seismic moment radiation pattern |
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