Improvement of Computation Method of Fault Motion Coordination Ratio and Analysis of Earthquake Cases  

作　　者：Li Ruisha Zhang Xi Jia Xiaodong Tang Hongtao 

机构地区：[1]Second Crust Monitoring and Application Center,CEA [2]Earthquake Administration of Liaoning Province

出　　处：《Earthquake Research in China》2014年第1期54-61,共8页中国地震研究（英文版）

基　　金：funded by the Youth Seismic Regime Tracking Project in the Year of 2012,China Earthquake Administration(2012020203);the Youth Seismic Regime Tracking Project in the Year of 2011(2011020207);the National Key Technology R&D Program of the 12th "Five-year Plan",China

摘　　要：According to the concept of the fault motion coordination ratio( FCR),this paper discusses the effect of the starting point on the result of FCR calculation and puts forward the calculation method for FCR using the sliding window and the index for evaluating the dispersion. Earthquake cases analysis shows that at the Lijiang site across the fault: the FCR value varied greatly and its distribution was dispersive before the MS7. 0 Lijiang earthquake,while the value was stable and less dispersive after the earthquake,which reflects the strain accumulation of the fault during the seismogenic process and the poor movement coordination between the motion of the three components. After the earthquake,the fault was in a free activity state,the accumulated strain energy released, and the movement of the three components was coordinated mutually. At present,FCR dispersion of Lijiang is at a low value,and fault strain accumulation is at a low level.According to the concept of the fault motion coordination ratio （FCR） , this paper discusses the effect of the starting point on the result of FCR calculation and puts forward the calculation method for FCR using the sliding window and the index for evaluating the dispersion. Earthquake cases analysis shows that at the Lijiang site across the fault： the FCR value varied greatly and its distribution was dispersive before the Ms7.0 Lijiang earthquake, while the value was stable and less dispersive after the earthquake, which reflects the strain accumulation of the fault during the seismogenic process and the poor movement coordination between the motion of the three components. After the earthquake, the fault was in a free activity state, the accumulated strain energy released, and the movement of the three components was coordinated mutually. At present, FCR dispersion of Lijiang is at a low value, and fault strain accumulation is at a low level.

关 键 词：Lijiang earthquake Fault motion coordination ratio （FCR） Cross-faultmeasurement DISPERSION 

分 类 号：P315[天文地球—地震学]