Inversion of source parameters and attenuation of the Tangshan aftershocks |
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| Authors: | Yong Sun Sihua Zheng and Shirong Mei |
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| Institution: | (1) Seismological Bureau of Liaoning Province, 110031 Shenyang, China;(2) Center for Analysis and Prediction, State Seismological Bureau, 100036 Beijing, China |
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| Abstract: | Source parameters and characteristics of regional attenuation of Tangshan aftershocks are studied by using digital records
of Tangshan aftershocks. An inversion method of P wave spectra to reduce influence on the ambiguity in the estimates of parameters
by the usual spectrum analysis method is developed. By testing with digital simulation data and applying to actual data, it
is confirmed that the method is usable.
Source parameters of the Tangshan Luanxian area are obtained by using records of 35 earthquakes at 5 stations.Q values of P wave and high frequency decay rate γ of source spectrum at 5 stations are obtained. TheQ values range from 408 to 847, and the mean value is 520; whiley ranges from 1.54 to 3.22, and the mean value is 2.41.
In the studies of spectra of the micro-earthquakes in the Luanxian area, that stress drop increases with increasing earthquake
moment is found.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 430–441, 1991. |
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| Keywords: | source parameters attenuation scaling law |
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