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南北地震带中段位于中国大陆腹部，是青藏块体、华北块体和扬子块体的中间枢纽部位。根据该区布格重力异常图，采用Ｐａｒｋｅｒ’ｓ三维位场方法进行莫氏面反演并计算该区不同窗口的剩余场，推断和解释了４条岩石圈断裂，进而研究它们与地震的关系。深部孕震的有利部位是：区域性重力梯级带；地壳厚度变异带或莫氏回等值线发生转折的部位或莫氏面隆起的边缘；重力正负剩余异常的零值线附近以及活动的深大断裂。
The middle section of the North-South Seismic Belt is located in the belly of the Chinese mainland and is the central hub of the Qinghai-Tibet block, the North China block and the Yangtze block. Based on Bouguer gravity anomaly maps of this area, Parker’s three-dimensional field method is used to do the Mohsian inversion and calculate the remaining fields in different windows of the area to infer and interpret the four lithospheric faults and to study their relationship with earthquakes . The favorable sites for deep seismogenic activities are: regional gravity cascade zone; the turning point of the crustal thickness variation zone or the Morse return contours or the edge of the Mohsian uplift; the positive and negative residual anomalies around the zero line and the active Deep fracture.