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对获得的玉树震区的人工地震测深资料,利用正演拟合地震测深方法进行处理与计算,获得了玉树震区的地壳速度结构和构造的基本特征。结果表明,不同区域的地壳速度结构在纵向和横向上均具有明显的非均匀性。地壳呈层状结构,研究区结晶基底界面起伏较大,玉树附近下方较厚达8km左右,在400.0km桩号向北至温泉方向基底结构逐渐减薄为2.5km。基底界面的凹陷、隆起与不同的地质构造单元具有较好的对应关系;地壳厚度由囊谦、玉树附近的72km向南、北逐渐减薄为62km。在200.0~400.0km桩号之间二维速度等值线及壳内界面起伏变化较大,在玉树附近下方莫霍面有一弧形凹陷。
The obtained artificial seismic sounding data of Yushu earthquake area are processed and calculated by using forward fitting seismic sounding method, and the basic characteristics of crustal velocity structure and structure in Yushu earthquake area are obtained. The results show that the crustal velocity structures in different regions have obvious inhomogeneities in both vertical and horizontal directions. The crust has a layered structure. The interface of the crystalline basement in the study area fluctuates greatly. The thickness below the Yushu is up to about 8km. The basement structure is gradually thinned to 2.5km in the direction of the hot springs along the 400.0km stake. The depression and uplift of the basement interface have good correspondence with different geological structural units. The thickness of the crust is reduced from 62km near the Yushu neighborhood to 72km to the south and north by 62km. In 200.0 ~ 400.0km station between the two-dimensional velocity contours and shell interface fluctuations vary greatly, near the bottom of Yushu Moho has an arc-shaped depression.