| Study on rupture zone of the M=8.1 Kunlun Mountain earthquake using fault-zone trapped waves |
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| 作者姓名： | 李松林 张先康 樊计昌 |
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| 作者单位： | Research Center of Exploration Geophysics，China Earthquake Administration，Research Center of Exploration Geophysics，China Earthquake Administration，Research Center of Exploration Geophysics，China Earthquake Administration Zhengzhou 450002，China，Zhengzhou 450002，China，Zhengzhou 450002，China |
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| 基金项目： | Joint Earthquake Science Foundation of China (201001). |
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| 摘 要： | Introduction The study on deep crustal faults has been one of the most vigorous subjects in seismology. In the past, 3-D deep seismic sounding and 3-D seismic tomography were usually used for this pur-pose. But it is difficult to obtain the fine structures of the faults in deep crust by these methods. Recently, seismologists in the world pay more attention to the fault zone trapped waves. Since the fault-zone trapped waves arise from coherent multiple reflections at two boundaries of the fau…
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Study on rupture zone of the M=8.1 Kunlun Mountain earthquake using fault-zone trapped waves |
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| LI Song-lin ZHANG Xian-kang FAN Ji-chang Research Center of Exploration Geophysics,China Earthquake Administration,Zhengzhou ,China.Study on rupture zone of the M=8.1 Kunlun Mountain earthquake using fault-zone trapped waves[J].Acta Seismologica Sinica(English Edition),2005,18(1). |
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| Authors: | LI Song-lin ZHANG Xian-kang FAN Ji-chang Research Center of Exploration Geophysics China Earthquake Administration Zhengzhou China |
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| Institution: | Research Center of Exploration Geophysics, China Earthquake Administration, Zhengzhou 450002, China |
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| Abstract: | The observation of the fault-zone trapped waves was conducted using a seismic line with dense receivers across surface rupture zone of the M=8.1 Kunlun Mountain earthquake. The fault zone trapped waves were separated from seismograms by numerical filtering and spectral analyzing. The results show that: a) Both explosion and earthquake sources can excite fault-zone trapped waves, as long as they locate in or near the fault zone; b) Most energy of the fault-zone trapped waves concentrates in the fault zone and the amplitudes strongly decay with the distance from observation point to the fault zone; c) Dominant frequencies of the fault-zone trapped waves are related to the width of the fault zone and the velocity of the media in it. The wider the fault zone or the lower the velocity is, the lower the dominant frequencies are; d) For fault zone trapped waves, there exist dispersions; e) Based on the fault zone trapped waves observed in Kunlun Mountain Pass region, the width of the rupture plane is deduced to be about 300 m and is greater than that on the surface. |
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| Keywords: | fault-zone trapped waves M=8 1 Kunlun Mountain earthquake seismic rupture plane |
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