2001～2004年陕西关中地区地壳运动及应变分析

The analysis on crustal movement and strain characteristics in Guanzhong region of Shanxi province between 2001 and 2004 year

根据2001～2004年陕西省地震局GPS测站的观测资料,做出了陕西关中地区地壳运动速率和地壳水平应变场,结果表明:①相对于稳定的欧亚板块,陕西关中东西部在不同期次地壳运动差异明显;②该区最大剪应变与面应变高值区主要分布在关中地区中部的铜川-三原-西安-咸阳一带、华县以及宝鸡-眉县附近,应变梯度较大,并且主要受面收缩影响,地震危险性相对较高。

According to GPS data of Guanzhong region and its neighboring region obtained by the seismological Bureau of Shanxi Province from 2001 to 2004,we have analyzed current crustal strain field of the region.Its characteristics are as following:① the east and west parts in Guanzhong region crust movement vary obviously relative to the stable plate of Eurasia.(② the) max shear strain and high value zone of surface strain are located in Tongchuan-Sanyuan-Xi′an-Xianyang,Hua county and Baoji-Meixian,the earthquake danger of these regions is comparatively higher,strain gradient is greater from effect by surface compressive.