震源介质参数的连续监测及其在张北地震前的变化

Abstract

Abstract: Continuously monitoring the compo site focal mechanism, coda Q and seismic wave velocity ratio, we have found that the inconsistency ratio of composite focal mechanism in 1997 reached its lowest value over the years and its direction similar to the Zhangbei earthquake. The coda Q0 for 30-60s-ti me window in 1997 is higher than before and the wave velocity ratio from February of 1995 to M arch of 1997 were lower than usual. These variations can be used as precursors to predict earthquake, also are helpful for us to understand the physical process of earthquake preparation and development.

Key words: Compo site focal mechanism, Coda Q value, Wave velocity ratio, Zhangbei earthquake

CLC Number:

P315.3

ZHANG Tian-zhong, GAO A-jia, HUANG Rong-liang, LIU Qing-fang. Continuous monitoring of focal medium parameters and their changed before Zhangbei earthquake[J]. EARTHQUAKE, 2000, 20(z1): 154-161.

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Continuous monitoring of focal medium parameters and their changed before Zhangbei earthquake

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