汶川地震前后绵阳市基础控制变化与分析  

The Effect of Wenchuan Earthquake to the Topography being Covered by Mianyang Basic Control Network

作　　者：张云[1] 陈勇[1] 徐必礼 蒋勇[1] 陈现春[3] 

机构地区：[1]四川省第三测绘工程院,四川成都610500 [2]绵阳市城市规划设计院勘测所,四川绵阳621000 [3]四川省第一测绘工程院,四川成都610100

出　　处：《测绘》2009年第6期266-268,共3页Surveying and Mapping

摘　　要：本文首先分析了绵阳市基础控制网的相关精度和地震前后同一控制点坐标差的限差要求,然后根据地震前后绵阳市GPS控制网的坐标变化,得出了地震对GPS控制网覆盖范围区域的地形影响:该区域地形向东南方向分别移动的平均值为27.4cm和11.6cm;同时,越往西北方向,坐标点位差值越大,最大值为79.2cm;由于不是均匀平移,从而推断地震可能导致该区域部分地形隆起或下降。Firstly this article analyzed the precision of Mianyang basic control network and the tolerance of the same point coordinates difference surveyed at different time, then according to the variety of Mianyang GPS control points, this article elicit the effect of Wenchuan earthquake to the topography being covered by Mianyang basic control network： the average values of this area separately moved to east and north are 27.4cm and 11.6cm; simultaneity, the more far from southeast to northwest, the larger value of point position difference is larger, the largest value is 79.2cm;because of the asymmetrical movement, this article deduced that the topography of this area be likely to arise or descend.

关 键 词：GPS控制网 地震影响 坐标差限差 地形变化 

分 类 号：P228.4[天文地球—大地测量学与测量工程]