Stress Triggering of Static Coulomb Stress of Xinjiang Bachu-Jiashi Earthquake of Ms 6.8, Feb. 24, 2003
2003年2月24日新疆巴楚—伽师Ms6.8地震的静态库仑应力触发作用

An arthquake of M_S 6.8 occurred in Bachu-Jiashi county,Xinjiang,on Feb.24,2003.There were 7 strong aftershocks greater than M_W 5 till June 30th,2004,and aftershocks of the sequence were richer and stronger.The article calculates the change of static stress of M_S 6.8 mainshock,both mainshocks and aftershocks on the rupture surface of sequent mid-strong aftershocks.Considering epicenter location error,the article discusses the change of static stress of M_S 6.8 mainshock,both mainshock and mid-strong aftershocks in different aspects,and analyses quantitatively the relation between static stress change of M_S 6.8 sequence and fault type,and delay time and spatial range effected by the static triggering model.It is reasonable to employ the focal mechanism solution and depth in Harvard CMT catalogue and Xinjiang results of the location epicenter,and 7 mid-strong aftershocks occured all in the increasing region of coulomb fracture stress,which passes signal test.A general analysis shows that Bachu-Jiashi earthquake of M_S 6.8 triggered sequent mid-strong aftershocks in certain degrees,but triggering between mid-strong aftershocks is not remarkable.With the limitation of present source location precision,we are not sure that 7 events were completely triggered by M_S6.8 mainshock.