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通过计算和研究1733-1850年期间发生在小江-则木河断裂带上的、由4次M≥7地震组成的大地震序列引起的库仑应力变化图像,分析先发大地震破裂对后发大地震破裂的静态应力触发作用.结果表明,在该序列中,后发大地震破裂均发生在先发大地震破裂引起的库仑应力显著增加区内.其中,1733年小江断裂带北段的73/4级大地震破裂和1833年中段的8级大地震破裂均引起则木河断裂带较显著的库仑应力正值变化,亦即1850年则木河断裂带发生的71/2级大地震与前2次大地震破裂引起的应力触发作用有关;1733年小江断裂带北段和中-南段的73/4级和1789年2次7级大地震均对该断裂带中段产生了十分显著的库仑应力触发作用,与此相关的是1833年8级大地震的发生.因此,认为小江断裂带各段之间以及该断裂带与则木河断裂带之间存在显著的力学上的相互作用.
By calculating and studying the Coulomb stress changes caused by the large earthquakes composed of 4 M ≥ 7 earthquakes occurred on Xiaojiang-Zemuhe fault zone during 1733-1850, The results show that in this series, the large post-earthquake earthquake rupture occurred in the significant increase of Coulomb stress caused by the rupture of the first large earthquake, of which 73 / The magnitude 4 and magnitude 8 earthquakes ruptured in the mid-1833 caused positive changes in the Coulomb stress in the Zemuhe fault zone, that is, the 71/2 magnitude earthquake that occurred in the 1850 Zemuhe fault zone Earthquakes caused by the rupture of two large earthquakes; the 73/4 in the north and middle-southern sections of Xiaojiang fault in 1733 and the two in the 1789 earthquakes in 1789 all produced a very significant Coulomb This is related to the occurrence of a magnitude 8 earthquake of 1833. Therefore, it is believed that there is a significant mechanical interaction between the various segments of the Xiaojiang fault zone and between the fault zone and the Zemuhe fault zone.