西秦岭造山带及邻区地壳深部结构及动力学研究

西秦岭造山带是东西向的中国大陆中央造山系、近南北向的川滇—贺兰构造带和中新生代以来形成的青藏高原之间交接转换的关键构造结，是地壳深部结构和地球物理场发生变化的转折带或重要梯级带。利用2010年以来在西秦岭造山带及邻近地区完成的人工地震密集长观测距宽角反射/折射剖面数据，结合同期在该区域开展的密集台阵和固定台网记录到的爆破数据，采用复杂结构中的射线追踪、非线性走时反演和波形拟合等方法，构建西秦岭造山带三个重点区位及邻近区域的地壳二维P波、S波速度结构，并对长观测距上记录到的来自岩石圈地幔的震相进行分析，约束研究区上地幔顶部速度与界面结构。结合地震活动性和重力布格异常数据，构建综合地球物理剖面，深入理解秦岭造山带中西部及邻近区域的深部构造背景、造山带构造演化和强震孕育环境等科学问题。

The contact area between West Qinling orogenic belt and north-south seismotectonic belt is a special joint position of north-south and east-west structural transformation in China mainland. Crustal structure and geophysical field generated geological and geophysical transition belt beneath the west Qinling orogenic belt. In this study, we simultaneously invert refraction, wide-angle reflection and chemical explosion traveltimes from permanent seismic network, broadband seismic array and controlled source seismic profiles to image 2D variations in crust and uppermost mantle P-wave speed, S-wave speed and Moho structure beneath the west Qinling orogenic belt and its adjacent areas. Crustal strucutre modeling and invesion technique will be applied to estiblish 3 two dimensional P- and S- wave velocity strucutre. The hybrid tomography and modeling mothod will provide the 3D crustal and uppermost mantle velocity structure of the west Qinling orogenic belt. The final model will provide seismic and comprehensive evidence which reveal the deep process of Qingling orogenic evolution, and discuss the dynamic mechanism of its contacted areas.