【摘要】 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。更多还原

【Abstract】 The crust\|upper mantle velocity structure and deep tectonic feature are obained in Haiyuan M 8.5 earrthquake region from the data processing of Xiji\|Zhongwei Deep Seismic Sounding(DSS) profile. The result shows that there is a great difference between the velocity structures of the two sides of the epicenter.The crust consists of alternative high and low velocity layers in the south side while in the north side it consists of a series of layers with positive velocity gradient.There exists a deep fault cutting the Moho or a anomalous deep structure in the epicenter region.更多还原