青藏高原东北缘是中国大陆构造运动和地震活动较强的地区之一。深入了解该区深部地壳结构构造及物性特征是获得该区强震孕育环境的重要条件，而人工源地震宽角反射/折射是获得壳幔精细速度结构和构造的重要手段。本项目拟根据该区已完成的6条深地震测深剖面、2014年上半年即将完成的南北地震带北段布设的3条深地震测深剖面、台阵和台站S波数据，并结合研究区天然地震数据，参考P波研究结果，采用正、反演算法获得研究区3条剖面S波的二维精细壳幔速度结构、波速比（Vp/Vs）、泊松比结构和各向异性等；并根据点、线、面相结合的三维完备观测系统数据，构建研究区S波的三维精细壳幔速度结构模型、波速比、泊松比模型，为该区壳幔结构特征、各块体间耦合关系及强震孕育环境研究提供重要的参数，对搞清壳幔构造形态、属性、变形机制和其形成演化过程具有重要意义。

The northeastern margin of the Tibetan Plateau is the tectonic movement in China and one of the strong seismic activity in the region . In-depth understanding of the deep crustal structure and physical properties of the structure is an important condition for the area to get the environment of strong earthquakes in the area , and wide-angle seismic reflection artificial source / refraction is an important means to get the crust-mantle velocity structure and fine structure . The project contemplated under six deep seismic sounding profile in the area has been completed , the northern section of the north-south seismic belt is nearing completion of the first half of 2014 laid three deep seismic sounding profile , array and station S -wave data , combined with natural seismic data in the study area , reference P -wave studies , the use of positive and negative algorithm to obtain a cross-sectional study area three -dimensional S -wave velocity structure of the crust and mantle of fine , velocity ratio (Vp / Vs), Poisson's ratio and isotropic structure heterosexual , etc. ; complete and in accordance with the three-dimensional observation points , lines and planes combined system data to construct a three-dimensional fine crust-mantle velocity structure model in the study area S wave velocity ratio , Poisson's ratio model of the crust-mantle structure of the area , each block coupling relationship between the body and the strong earthquakes environmental studies provide important parameters, find out the crust and mantle structure morphology , properties , deformation mechanisms and their formation and evolution is important.