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本文根据地质、地貌、物探、震源机制、地形变、历史地震等资料,分析了东川——宜良地区强震重复发生的构造原因,得到的结论是:小江断裂东西两支交汇的东川地区,两分支的左旋运动相互受到阻挡,从而应变能在那儿容易积累。往南,小江断裂东西两支左旋运动受到寻甸——嵩明,小新街——杨林北东向断裂的阻挡,造成应力集中。基于以上分析,对本区地震活动趋势作了初步的讨论。
Based on the data of geology, geomorphology, geophysical prospecting, focal mechanism, topographic changes and historical earthquakes, this paper analyzes the tectonic reasons for the repeated occurrence of strong earthquakes in Dongchuan-Yiliang area, and concludes that the Dongchuan area , The two branches of the left-handed motions are blocked from each other so that the strain can easily accumulate there. In the south, the two left-hand movements of the Xiaojiang fault are blocked by the Xidian-Songming, Xiaoxinjie-Yanglin north-east faults, resulting in stress concentration. Based on the above analysis, the trend of seismic activity in this area was preliminarily discussed.