用GPS技术监测南极半岛地区形变的结果初步分析

“全南极 GPS国际联测”已经进行了 6期观测。我们选取了位于西南极乔治王岛地区的 7个 GPS站 ,并加入 2个 IGS站 ,分别对 1 995、1 996、1 998年的同期 (GPS年积日 0 2 0 - 0 4 0 )观测数据进行了基线处理 ,相对精度可达 1 0 - 8- 1 0 - 9。并对 GAMIT软件解算得到的松弛解和强约束解分别进行了网平差处理 ,结果证明该地区比较稳定 ,总体上有 1 0 mm/a左右向西南方向的运动趋势。

THE RESULT ANALYSIS FOR THE DEFORMATION MONITORING BY USING GPS TECHNOLOGY IN ANTARCTIC PENINSULA

SCAR Epoch GPS Campaigns were hosted by Working Group on Geodesy and Geographic Information (WGGGI) of Scientific Committee on Antarctic Research (SCAR). The main objectives of this project were defined as follows: Measurement of the relative rates and the directions of separation of the Antarctic Plate from adjoining plates and microplates; Determination of relative motion of crustal blocks within the Antarctic Plate; Determination of vertical motion of the Antarctic lithosphere due to changing ice and ocean loadings; and Link of Antarctic tide gauges to the ITRF. As a member of the SCAR WGGGI, China had participated in the campaigns including both Great Wall Station and Zhongshan Station. The former had reoccupied five stages and the latter four stages respectively. The 7 stations, located at the Antarctic Peninsula, were selected to be processed. Meanwhile, 2 IGS stations were included. The results denote that the plate is steady in Antarctic Peninsula with a 10mm/a drift velocity to southwest.