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2010-04-14我国青海玉树附近发生Mw 6.9级地震。具体研究了该地震的前震-主震-余震序列应力触发模式及主震对周边断层的应力扰动。结果表明,大部分余震分布在同震库仑应力正区且余震触发率达76.4%;Mw 4.9级前震对Mw 6.9级主震的触发作用不甚明显,而后者对Mw 6.1级余震有明显触发作用;甘孜-玉树断层几乎都处于同震库仑应力加载状态,该断层上的历史破裂段如1738年M7.5级地震的当江段、哈秀段以及1896年M 7.3级地震的邓柯段未来更倾向于再次错动,造成强烈地震。
2010-04-14 Mw 6.9 earthquake near Yushu, Qinghai, China. The stress triggering mode of the pre-earthquake-mainshock-aftershock sequence and the stress disturbance of the main fault to the surrounding faults are studied in detail. The results show that most of the aftershocks are distributed in the positive coseismic Coulomb stress zone and the triggering rate of aftershocks is 76.4%. The triggering effect of Mw 4.9 pre-earthquake on Mw 6.9 mainshock is not obvious, while the latter triggering Mw 6.1 aftershock Most of the Ganzi-Yushu faults are in the coseismic Coulomb stress loading state. The historical ruptures of the fault such as the Dangjiang section of the M7.5 earthquake in 1738, the Haxi section of the M38.5 earthquake and the Dengcai section of the M 7.3 M 18 18 earthquake More inclined to move again, resulting in a strong earthquake.