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2003年2月24日新疆巴楚—伽师发生MS6.8地震,截止2004年6月30日发生了7次MW5以上的中强余震,序列的余震丰富、强度大.本文求算了MS6.8主震及其序列中主震和中强余震共同在后续中强余震(7次MW5.0以上余震)破裂面上产生的静态库仑破裂应力变化情况.考虑到震中定位的误差,分几种情况分别讨论了此次MS6.8主震及其中强余震产生的库仑破裂应力变化情况,并定量分析了MS6.8地震序列静态库仑破裂应力变化与断层类型的关系及其静态应力触发模型作用的延迟时间和空间范围.认为采用哈佛大学矩心矩张量目录的震源机制解、矩心深度和新疆震中定位结果较合理,由此得到的7次中强余震均发生在库仑破裂应力增加的区域.综合分析表明,巴楚—伽师MS6.8主震对后续中强余震具有一定的触发作用,而中强余震之间的触发作用不显著.但由于目前震源定位精度的限制,不能肯定序列中7次中强余震是完全受MS6.8主震触发而发生的.
On February 24, 2003, an MS6.8 earthquake occurred in Bachu-Jiashi area of Xinjiang Uygur Autonomous Region, and seven moderate-intensity aftershocks of MW5 or above occurred on June 30, 2004. The sequence aftershocks are rich and strong, and MS6 is calculated. 8 Main shock and its sequence Main shock and medium-strong aftershock Together, the static Coulomb failure stress changes on the rupture plane of the subsequent moderate-strong aftershocks (7 times MW5.0 aftershocks). Taking into account the errors of epicenter positioning, The situation of Cumulus rupture stress changes caused by the MS6.8 main shock and its strong aftershocks were discussed respectively and the relationship between the static Coulomb rupture stress and the type of the fault and its effect of static stress triggering model Delay time and spatial range.However, the focal mechanism solution, the centroid depth and the epicentral location in Xinjiang are more reasonable by using the harmonic moment tensor catalog of Harvard University, and all the seven moderate-strong aftershocks occurred in the areas with increased Coulomb failure stress The comprehensive analysis shows that the Bachu - Jiashi MS6.8 mainshock has a certain triggering effect on the subsequent moderate strong aftershocks, while the triggering effect of the moderately strong aftershocks is insignificant, but due to the limitation of the current source localization accuracy, it can not be affirmed 7 times in a column is completely under MS6.8 strong aftershocks triggered by the main shock occurred.