Attenuation of coda waves and Q c value beneath the Chengdu telemetered seismic network |
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| Authors: | Jian Zeng Tian-Chang Chen Wei-Bin Han Jun Fan Si-Hua Zheng Akira Hasegawa Shigeki Horiuchij and Satoshi Matsumoto |
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| Institution: | (1) Seismological Bureau of Sichuan Province, 610041 Chengdu, China;(2) Center for Earthquake Prediction and Analysis, 100036 Beijing, China;(3) Observation Center for Prediction of Earthquakes and Volcanic Eruptions, Faculty of Science, Tohoku University, 980 Sendai, Japan |
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| Abstract: | Based on the single scattering model of coda power spectrum analysis, digital waveform data of 50 events recorded by the real-time
processing system of the Chengdu telemetry network are analyzed to estimate the Q
c values of earth medium beneath the Chengdu telemetry network for several specified frequencies. It is found that the Q
c shows the frequency dependency in the form of Q
c = Q
0
f
n in the range of 1.0 to 20.0Hz. Estimated Q
0 ranges from 60.83 to 178.05, and n is found to be 0.713 to 1.159. The average value of Q
0 and n are 117 and 0.978 respectively. This result indicates the strong frequency dependency of the attenuation of coda waves beneath
the Chengdu telemetry network. Comparing with the results obtained in other regions of the world, it is found that Q
0
−1 value and its change with frequency are similar to those in regions with strong tectonic activity.
This subject is supported by the Ministry of Personnel, China for partly sponsoring. |
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| Keywords: | Chengdu telemetered network coda Q frequency dependency tectonic activity |
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