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本文根据昌马地震破裂带的特征所反映的震区地质块体在空间的运动方式,对前人关于昌马地震的主压应力方向及相应的构造应力场提出了异议。通过讨论,阐述了昌马地震是现今作用于震区的北东东向挤压的区域应力场活动的结果,昌马地震破裂带是北北西向断裂和北西西向断裂在北东东向挤压应力场作用下,分别作兼有右旋的逆冲和近水平左旋扭动的产物。
According to the movement mode of the geologic block in the earthquake area reflected by the characteristics of the Changma earthquake rupture zone, this paper proposed the objections to the principal compressive stress direction and the corresponding tectonic stress field of the Changma earthquake. Through the discussion, it is expounded that the Changma earthquake is the result of the current regional stress field activity in the NE direction squeezed in the earthquake zone. The Changma earthquake rupture zone is the north-northwest strike and the NW strike strike in the NE strike Under the action of stress field, they are the products of both right-handed thrusting and near-horizontal left-handed twisting.