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Title:: Spatial Evolution of Earthquake Frequency before Ning'er M_S6.4 Earthquake in 2007

Author(s):: SHA Hai-jun; LIU Dong-ying; ZHANG Guo-hong; (Institute of Crustal Dynamics,China Earthquake Administration,Beijing 100085,China)

Keywords:: spatial scan; frequency of earthquakes; spatial evolution; S6.4 Earthquake' target='_blank'> Ning'er M_S6.4 Earthquake

摘要:: 使用时空扫描方法,研究了2007年宁洱6.4级地震震前川滇地区地震频度的空间演化过程,发现自2007年2月到震前,川滇地区整体上地震活动呈现持续增强的变化; 而思茅地区的地震活动自2007年2～4月增强,5月份减弱,同期文山地区出现地震活动的增强。从应力场演化的角度探讨此次地震的孕震过程,认为2007年4～5月间,思茅与文山地区地震活动演化的差异与宁洱地震的发生有关。

Abstract:: A earthquake of M_S6.4 occurred at Ning'er county of Yunnan Province on June 3,2007.For a study of seismometric precursor of the earthquake,the method of spatial scan is used,and spatial evolution of earthquake frequency in Chuandian region before the earthquake is studied.Earthquake activity in Chuandian region continued enhancing before the earthquake since Feb.2007.Earthquake activity of Simao area had enhanced from Feb.to Apr.2007,then weakened in May.2007.Enhancing earthquake activity in Wenshan area occurred in the same period.A primary discussion of seismogenic process of the Ninger earthquake is present from viewpoint of stress field,which shows the occurrence of Ninger earthquake may be related with the difference of earthquake activity evolution between Simao and Wenshan.