通过对南北向的西吉—中卫宽角反射 /折射剖面测深资料的二维处理、计算和解释 ,研究了中宁、中卫和同心一带弧形构造及其两侧的壳幔速度结构和深部构造的基本特征。结果表明 ,3个区域的壳幔速度结构在纵向和横向上均具有明显的非均匀性 ,标志壳幔深部构造存在着差异 ,地壳厚度变化大 ,弧形构造带中部为一莫霍面隆起 (深 4 5 0km) ,弧形构造带南北两侧上地壳中存在不同的低速块体。 Based on the two-dimensional processing, calculation and interpretation of north-south Xiji-Zhongwei wide-angle reflection / refraction profile sounding data, the authors studied the arc structure and the crust-mantle velocity structure and deep The basic characteristics of the structure. The results show that the crust-mantle velocity structures of the three regions have obvious inhomogeneities in both longitudinal and lateral directions, which indicate that there are differences in deep crustal structures, the crustal thickness changes greatly, and the central part of the arc-shaped structural belt is a Moho uplift Depth 450 km), there are different low-velocity blocks in the upper and lower crust of the arc structure belt.