Analysis on the Regional Features of Coda Attenuation Before and After the 1992 Qina (M_S= 5.4, 5.1) Earthquakes in WYEPSA
Analysis on the Regional Features of Coda Attenuation Before and After the 1992 Qina (M_S= 5.4, 5.1) Earthquakes in WYEPSA出 版 物：《Earthquake Research in China》 (中国地震研究（英文版）)
年 卷 期：1996年第10卷第2期
页 面：47-58页
学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学]
基 金：This project was sponsored by the Eighth Five-Year-Plan of SSB China
主 题：Anomalous character Q value method of the coda wave Earthquake precursor Western-Yunnan seismological experiment site
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) 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
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