基于GPS的关中地区地壳水平运动研究

Reaseach on the crustal horizontal movement of Guanzhong area based on GPS

以“中国地壳运动观测网络”观测数据以及陕西省GPS观测网2001—2005年的5期观测数据为基础，应用GAMIT／GLOBK软件对数据进行精密解算，获得了陕西省关中地区2001～2005年相对于鄂尔多斯块体以及关中地区内部彬县站点的水平运动速度场。并结合板块构造学原理进一步分析了关中及其邻区的地壳运动规律：①GPS技术用于地壳运动的监测是可行的；②相对于较稳定的鄂尔多斯块体，关中地区整体呈现不连续性逆时针旋转；③关中地区中西部存在多处应力集中区，地壳的相对水平运动较为激烈；④关中地区中部泾灞隐伏断裂带附近地壳水平运动激烈，属潜在多震区。

Based on the GPS data of China Crust Movement Observation Network and Shaanxi GPS Observation Network during 2001-2005, using the software of GAMIT/GLOBK to process data exactly, the horizontal movement rate-field in Shaanxi Guanzhong Area is obtained, which is relative to the stable Ordos Block and Binxian Point from 2001 to 2005. Combining with the plate tectonic theory, the main conclusions can be elicited as follow： （1）It is feasible to use GPS technology to take the inspection of crustal movement; （2）Relative to the stable Ordos Block, Guanzhong Area shows its discontinuous anticlockwise rotation; （3）There are a few of stress concentration areas in the middle and west of Guanzhong Area, and the relatively crustal horizontal movement is strong; （4）The area near Jing-Bar Hidden Faulted Zone, which is in the middle of Guanzhong Area, is a potential multiple earthquake region, where the relatively crustal horizontal movement is quite strong.