用GPS监测西安市南郊地壳形变

MONITORING THREE DIMENSION CRUSTAL DEFORMATION IN SOUTH SUBURB OF XI'AN CITY BY GPS

介绍了用GPS监测到的西安市南郊的地壳三维形变 ,并与 1990年前后的传统测量结果相比较 ,分析了西安市的地壳形变特征。结果表明 :西安市南郊地面沉降速率有所减慢 ,但水平形变显著。观测结果与颗粒位移模型 (GDM )模拟的结果具有较好的一致性 ,说明导致地面形变的主要因素为过量抽取地下水。

In this paper,the three dimensional crustal deformation monitored by GPS in south suburb of Xi'an city is discussed.The feature of crustal deformation is analyzed and compared with the results from the traditional survey before 1990.The comparison indicates that the subsiding rate decreases a little,but the horizontal deformation is evident.The surveyed subsidence is in accord with the result simulated by using the Granular Displacement Model(GDM).The main factor causing ground deformation is pumping underground water too much.