印尼M_S8.7地震对中国大陆3次后续中强地震的动应力触发研究

Dynamic stress triggering of three subsequent moderately strong earthquakes in China′s mainland following the Indonesia M_S8.7 Earthquake

印尼8.7级地震发生后,在不到2个月时间内,在中国大陆相继发生了3次后续中强地震(2004年12月26日云南双柏MS5.1地震、2005年1月26日云南思茅MS5.1地震、2005年2月15日新疆乌什MS6.2地震),印尼地震和这3次后续地震是否存在触发关系?计算了印尼地震在3次后续地震破裂面上的动库仑应力变化和静库仑应力变化。静应力变化量小,低于一般认为的触发阈值(0.01 MPa);动应力变化峰值为10-1MPa,可能是这3次后续地震的触发因素。

In two months after Indonesia Ms8. 7 earthquake, three moderately strong earthquakes （December 26, 2004 Ms5. 1 Shuangbai earthquake, January 26, 2005 Ms5.1 Simao earthquake and February 15, 2005 Ms6.2 Wushi earthquake） occurred in China＂ mainland. Is there triggering relation between Indonesia Ms8. 7 Earthquake and the three subsequent earthquakes？ In this article we calculate the static and dynamic Coulomb stress changes in failure planes of the three subsequent earthquakes for Indonesia Ms8. 7 Earthquake. The value of static stress change is smaller than the threshold one of triggering value （0.01 MPa）;The peak change of dynamic stress is about 10 1 MPa. So the change of dynamic stress is probably the triggering factor of the three subsequent earthquakes.