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对西吉 -中卫剖面深地震测深资料进行处理和解释 ,得到了海原 8 5级大震区的壳幔速度结构和深部构造。结果表明 ,震区南北两侧壳内存在着明显的速度结构差异 ,南侧呈高、低速相间的结构特征 ,北侧为正的速度梯度层 ;在震区的下方存在着M面断裂或构造异常带。
The deep seismic sounding data of Xiji-Zhongwei section are processed and interpreted, and the crust-mantle velocity structure and deep structure of the Haiyuan 8 5 earthquake area are obtained. The results show that there are obvious differences in velocity structure between the north and south sides of the earthquake zone, with high-speed and low-velocity structural features on the south side and a positive velocity gradient layer on the north side. There are M-plane faults or structures beneath the earthquake zone Abnormal band.