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巽他海沟西侧地壳北向运动的差异性是2012年苏门答腊地震发生的动力学成因.库仑应力计算表明,2004年和2005年苏门答腊2次特大逆冲型地震对本次地震具有显著的触发作用.有记录以来至2011年,本次地震的发震断裂带没有发生过7级以上地震,震源区附近存在5级地震空区,2004年大震后该空区被打破.震前6年、4.5年和3个月发生了3组前震活动,其中最显著的是震前3个月发生的7.2级直接前震.
The difference of crustal northward movement in the west side of Xuntai Trench is the dynamic cause of the Sumatra earthquake in 2012. Coulomb stress calculation shows that two extraordinary thrusts in Sumatra in 2004 and 2005 have significant triggering effect on this earthquake. There are no earthquakes of magnitude 7 or above in the seismogenic fault zone of this earthquake and there are 5 earthquakes near the focal point zone since the record was recorded in 2011. In the 6 years before the earthquake Three sets of foreshocks occurred in the year and three months, most notably the magnitude 7.2 direct foreshock occurring in the first three months before the earthquake.