中文摘要：

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.

英文摘要：

In this paper the crustal velocity structure is obtained along Yushu earthquake zone, using wide angle reflection and refraction data. The results reveal strong vertical and lateral heterogeneities in the crust, as well as the basic characteristics of the crustal velocity structure and the tectonics along the seismic sounding profile. Results show that crustal velocity structure is featured with significant regional heterogeneity both in the longitudinal and lateral directions. The crust is of layered structure, and the crystalline basement interface undulates greatly beneath the study area, which is about 8km in thickness beneath Yushu and gradually thins northwards to 2.5km beneath the Stake 400.0km at Wenquan. There are good correlations of the depressions and uplifts on basement interface with different tectonic units. The crust gradually thins towards both south and north direction to a thickness of 62km from 72kin beneath Nangqian and Yushu. There exist big undulations in 2D velocity contours and the interfaces in the crust between Stakes 200.0 - 400.0km, and there is presence of an arcshaped depression in the Moho beneath the Yushu area.