Research on the Source Parameters and Correlation Coefficients of Focal Mechanisms for the Yingjiang Earthquake Sequences in 2008

作     者：Deng Fei Liu Jie 

作者机构：Institute of Earthquake ScienceCEA China Earthquake Networks Center 

出 版 物：《Earthquake Research in China》 (中国地震研究（英文版）)

年 卷 期：2015年第29卷第1期

页      面：68-83页

核心收录：

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：funded under the National Science and Technology Support Program of the 12th "Five-year Plan" China(2012BAK19B02) 

主　　题：Stress drop Correlation of focal mechanisms Clustering group Yingjiangearthquake sequences in 2008 

摘      要：The source parameters of the Yingjiang earthquake sequences in 2008 are obtained by applying spectral analysis and Brunes source model,based on the digital waveform data recorded by the Yunnan Digital Seismic *** correlation coefficients are calculated using the low-frequency spectral amplitudes of 2 events recorded by a same station,then,events with similar focal mechanism are grouped using the clustering analysis *** to the obtained focal mechanisms,it is found that there are good correlations with the azimuth of P axes in each clustering group,and the larger the correlation coefficient,the closer the azimuths of P *** divide the Yingjiang area into 3 regions to analyze the stress level and stress direction by combining the source parameters and the mean focal mechanism of each *** results show:The change and transformation of the focal mechanism types at different stages can represent the temporal characteristics of the regional stress *** the earthquake focal mechanism types are concentrated in a time period and switch to the direction of regional stress field,it may be a sign of strong *** is some relationship between the stress drop and the type of focal *** earthquakes with stress fields revealed by focal mechanism types closer to the regional tectonic stress field will have higher stress drop,while those with the focal mechanism-revealed stress fields differing a lot from the regional tectonic stress field will generally have a lower stress drop.