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Analysis on the Regional Features of Coda Attenuation Before and After the 1992 Qina (M_S= 5.4, 5.1) Earthquakes in WYEPSA
作者姓名:Qin Jiazheng  Liu Zuyin  and Long Xiaofan Seismological Bureau of Yunnan Province  Kunming  China
作者单位:Qin Jiazheng,Liu Zuyin,and Long Xiaofan Seismological Bureau of Yunnan Province,Kunming 650041,China
基金项目:This project was sponsored by the Eighth Five-Year-Plan of SSB, China.
摘    要:Using the theoretical model of coda scattering from local earthquakes, we have studied the features of time-space variations of the attenuation rate β of coda amplitude and coda Qc-1 values before and after the Qina earthquakes (MS5.4 and MS5.1) in Dec. 1992 in West Yunnan Earthquake Prediction Study Area (WYEPSA). The study results show that the attenuation rate of coda amplitude has remarkable regional inhomogeneity in the near-field (△ <50 km) around the main shock: β = 0.0076 s-1 and Qc-1 = 0.0056 during the main shock while (3 = 0.0209 s-1 and Qc-1 = 0.0153 during the aftershock. The Qc-1 value shows an approximate 3-foid variation before and after the main shock. We have also obtained the regional averages of β = 0.0235 s-1 and Qc-1 = 0.0153, which show that the coda attenuation in surrounding areas (△ > 50 km) far away from the epicenter of the main shock did not change much before and after the main shock. The evolution of Qc-1 values of the main seismic sequence with time has passed throug


Analysis on the Regional Features of Coda Attenuation Before and After the 1992 Qina (M_S= 5.4, 5.1) Earthquakes in WYEPSA
Qin Jiazheng,Liu Zuyin,and Long Xiaofan Seismological Bureau of Yunnan Province,Kunming ,China.Analysis on the Regional Features of Coda Attenuation Before and After the 1992 Qina (M_S= 5.4, 5.1) Earthquakes in WYEPSA[J].Earthquake Research in China,1996(2).
Authors:Qin Jiazheng  Liu Zuyin  and Long Xiaofan Seismological Bureau of Yunnan Province  Kunming  China
Institution:Qin Jiazheng,Liu Zuyin,and Long Xiaofan Seismological Bureau of Yunnan Province,Kunming 650041,China
Abstract:
Keywords:Anomalous character  Q value method of the coda wave  Earthquake precursor  Western-Yunnan seismological experiment site
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