亚太网三期GPS观测数据处理结果及地壳形变特征分析

本文对亚洲太平洋地区地球动力学计划(APRGP,简称亚太网)在1999-2001年采集的三期GPS观测数据,利用GAMIT/GLOBK软件进行了分析处理,得出各期的观测站在ITRF97框架下的三维直角坐标,并根据三期观测数据中的重复观测站进行了速度场计算和地壳形变特征分析。结果表明亚洲大陆板块具有明显的顺时针旋转运动特征;印度板块和澳大利亚板块从西南方向对亚洲大陆板块进行挤压;而西太平洋地区各观测站则向西北方向运动。这些特征与国内GPS区域网观测数据处理得出的结论是一致的,而本文则揭示了更大范围的亚洲太平洋地区地壳形变信息。

Data Processing of APRGP GPS in 3 Epoch Observations and Crust Deformation Analysis

In this paper,the data processing solution of APRGP GPS 3 observation epochs from 1999 to 2001 is given.The position estimation of each station in 3D rectangular coordinate system under ITRF97 frame is given by using GAMIT/GLOBK software,while the velocity field based on the data of re-occupied sites is computed and crust deformation of this region is also analyzed.The result shows that Asian mainland plate rotates clockwise,and been extruded by Indian plate and Australian plate from south-west,while the stations in western Pacific Ocean move toward northwest.All these features are consistent with those conclusions achieved by using GPS data from regional networks in China,while this paper provides the information on crust deformation in a wider region within Asia and the Pacific Ocean.