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本文根据安宁河地区布格重力异常资料进行位场变换后得到的深部重力异常,采用质面压缩法反演得出了莫霍面深度。研究了该区深部构造特征,利用重力垂直二次导数定性地划分了该区的深部断裂,对深部构造与地震的关系进行了探索性研究。认为:(1)该区处于青藏块体与华南块体的交接地带,深部构造特征也表现了这种交接带的复杂性;(2)地壳深部受近东西向构造影响十分强大,南北向的安宁河断裂在西昌以南段无深部构造背景显示;(3)强震活动区与深部构造关系密切,处于特殊构造部位的西昌——冕宁段今后仍是强震重复发生的地段。
Based on the Bouguer gravity anomalies in the Anning River region, the deep gravity anomalies obtained after the site field transformation are obtained. The depth of the Moho is obtained by the inversion of the surface compressive method. The deep tectonic features of this area are studied. The vertical faults are divided qualitatively by the quadratic derivative of gravity, and the relationship between deep structures and earthquakes is explored. The results show that: (1) The area is in the transition zone between the Qinghai-Tibet block and the South China block, and the deep structural features also show the complexity of this transition zone. (2) The deep crust is strongly influenced by the NE- The Anninghe fault has no deep tectonic setting in the south section of Xichang. (3) The active area of strong earthquakes is closely related to the deep structure, and the Xichang-Mianning section in the special tectonic part is still the area where strong earthquakes repeatedly occur in the future.