Q P and Q S in Beijing and Jianchuan, Yunnan areas |
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| Authors: | Francis T Wu Peide Wang and Yuntai Chen |
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| Institution: | (1) Department of Geological Sciences and Environmental Studies, State University of New York, 13901 Binghamton, New York, U.S.A.;(2) Institute of Geophysics, State Seismological Bureau, Beijing, China |
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| Abstract: | Events from the December 1982 Huairou County, Beijing, and the July 1982 Jianchuan, Yunnan earthquake series were recorded
at one station in Beijing City and at four stations in Eryuan area, Yunnan, respectively. Dividing the spectra (for P and
S waves) from the smaller events in the series by spectra (for corresponding P and S waves) from the larger events in cach
region, we have determined the high frequency source spectral decay rate to be ω−1in both cases. Through trial and error method, we are able to determine the appropriate constantQ
P andQ
S that corrects the individual spectra to the proper high frequency decay rate. It is found that aQ
P of 800 and aQ
S of 550 can adequately compensate for the attenuation of the waves in Beijing area. For Jianchuan, Yunnan area the corresponding
values are 900 and 400.
This subject is supported by Chinese Joint Seismological Science Foundation. |
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| Keywords: | Corner frequency Attenuation Peak acceleration Spectral ratio Spectral decay rate Quality factor Absorption property |
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