长距离动态GPS数据处理方法与汶川地震引起的动态地壳形变特征分析  

Long Distance Kinematic GPS Data Processing and Kinematic Crustal Deformation Features Analysis of Wenchuan Earthquake

作　　者：熊永良[1] 黄丁发[1] 徐韶光[1] 廖华[2] 

机构地区：[1]西南交通大学GPS卫星应用工程中心 [2]四川省地震局,成都市人民南路三段29号610041

出　　处：《武汉大学学报（信息科学版）》2010年第3期265-269,共5页Geomatics and Information Science of Wuhan University

基　　金：国家863计划资助项目(2007AA12Z315);国家自然科学基金资助项目(40874015)

摘　　要：利用长距离GPS动态数据处理方法,根据四川GPS网地震前后的观测数据,计算出了四川GPS网各站点地震前后的位移量。以相对稳定的雅安站为参考站,计算出了绵阳站和郫县站的动态变形序列。汶川地震动态地壳变形分析结果表明,地震期间,绵阳站和郫县站的主运动朝向西北方向,同时伴随有小幅摆动。在高程方向,绵阳站出现先上升后下降的运动特征,郫县站出现上下波动特征。Based on the analysis of the key problems about long distance kinematic GPS data processing, we caculated the displacements of the stations in Sichuan GPS network using the data before and after 5.12 Wenchuan Earthquake. The accuracy of long distance kinematic GPS data processing was analyzed. Kinematic deformation series of Mianyan and Pixian were obtained using Yaan as a reference station. Decomposing the deformation series into moun- tain Longmen fault direction and its orthogonal direction, the kinematic deformation features of several stations were obtained. Results about kinematic crustal deformation of Wenchuan Earthquake show that Mianyan and Pixian move towards northwest with small amplitude of swing during the earthquake. The maximum kinematic displacements of Mianyang and Pix- Jan were 49.2 cm and 114.1 cm respectively. In the vertical direction, the height of Mianyan decreased after uplifting 10 cm. The height of Pixian fluctuated periodically and the fluctua- tion range was ±13 cm.

关 键 词：长距离GPS 动态数据处理 动态地壳形变 变形特征 汶川地震 

分 类 号：P228.41[天文地球—大地测量学与测量工程]