思茅—普洱地区中强震的发生，区域上受局部横向隆起构造的控制。隆起区发育晚更新世以来活动的两组断裂，北北西向断裂右旋，北东东向断裂左旋，局部兼有正断层分量。两组断裂彼此交切形成棋盘格式块体构造。在区域右旋剪切力作用下，块体发生绕垂直轴的顺时针旋转。块本旋转时，在其顶角端产生构造闭锁，形成应变积累，引发中强震活动。多个块体旋转时，应变在多点集中，地震活动即出现群发型特征 The occurrence of moderate-strong earthquakes in the Simao-Pu’er region has been controlled by the local lateral uplift in the area. Two groups of faults active during the late Pleistocene in the uplift are dextral faults in north-northwest direction and leftward in northeasterly east-northeast direction, both of which have local normal faults. Two sets of fractures intersect each other to form a checkerboard format block structure. In the region under the action of right-handed shear, the block occurs around the vertical axis of the clockwise rotation. When this block is rotated, a structural closure occurs at its top apex, forming a strain accumulation that induces moderate-strong earthquakes. When multiple blocks rotate, the strain is concentrated at multiple points, and the earthquake activity shows the characteristics of mass hairstyle