Study on rupture zone of the M=8.1 Kunlun Mountain earthquake using fault-zone trapped waves

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 th...

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Bibliographic Details
Published in:Acta seismologica sinica 2005, Vol.18 (1), p.43-52
Main Author: 李松林 张先康 樊计昌
Format: Article
Language:eng ; chi
Subjects:
Decay
Dispersions
ear
Earthquakes
fault-zone
Faults
Filtering
Kunlun
M=8.1
Mountain
Mountains
Rupture
Seismic engineering
Seismic phenomena
trapped
waves
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Summary: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.[PUBLICATION ABSTRACT]
ISSN:1674-4519
1000-9116
1867-8777
1993-1344
DOI:10.1007/s11589-005-0005-0