Abstract: In terms of inversion results from P arrivals of local earthquakes,crustal velocity structrues have been investigated along the Tianshan from Xinjiang of China,Kazakhstan,to Kirghiztan.5 largEr blocks can be divided according to different features,indicating an inhomogeneous crust composition.Those low velocity belts in the crust psrts of foothills are believed to be the deep marks of the Tianshan in collision with surrounding blocks.The Tarim,Junggar and Ili blocks all have a trace of underthrusting the Tianshan.

Key words: Tianshan, Deep structure, Crustal structure, Low-velocity zone

摘要： 利用区域地震资料的反演结果,分别研究了中国新疆、哈萨克斯坦和吉尔吉斯斯坦境内天山的地壳速度结构。结果表明,沿天山一带地壳结构极不均匀,根据不同的性质可分为5个较大的块体；山体两侧的壳内低速带是天山与相邻地块碰撞的深部标志,塔里木、准噶尔和伊犁等地块都有向天山俯冲的痕迹。

关键词: 天山, 深部构造, 地壳结构, 低波速带