联合GPS、InSAR建立同震地表三维位移场  

ESTABLISHMENT OF 3-D COSEISMIC TERRAIN DISPLACEMENT FIELD WITH GPS AND InSAR

作　　者：徐克科[1,2] 牛元甫 伍吉仓[2] 

机构地区：[1]河南理工大学测绘与国土信息工程学院,焦作454000 [2]同济大学测绘与地理信息学院,上海200092 [3]河南工业和信息化职业学院,焦作454000

出　　处：《大地测量与地球动力学》2014年第1期15-18,23,共5页Journal of Geodesy and Geodynamics

基　　金：中美国际合作项目(2010DFB20190);国家自然科学基金(41074019);河南省教育厅自然科学基金(12A420001);河南理工大学青年基金(Q2012-32A)

摘　　要：通过GPS观测位移与InSAR-LOS形变的投影转换模型将GPS点位移归算到LOS方向。利用GPS点归算的LOS向位移,在构建Delaunay三角网基础上,进行三次内插,对InSAR-LOS形变误差进行纠正。基于非均匀滑动分布的位错模型,利用GPS观测数据反演断层参数。根据同震引起的地表位移在一定范围内方向具有一致性的特点,由断层参数正演同震位移场方向,将其作为已知方向,对InSAR-LOS位移实现了三维转换。结果表明,用此方法建立的同震地表三维形变场与地表实际破坏情况整体上吻合较好。The geometric transformation model between the INSAR-LOS deformation and GPS displacement is established. The model is employed to convert GPS displacement into the deformation in LOS direction. Based on Delaunay triangulations and cubic interpolation, the errors existed in InSAR-LOS deformation are rectified. Accord-ing to variable fault slip model, the fault parameters are acquired by accurate GPS observations. According to the characteristic that the displacement direction derived from coseism is accordant in certain range, the displacement direction derived from forward modeling was applied to realize the transformation from InSAR-LOS to three-dimen-sional deformation. The result shows that the displacement field is consistent with actual damage of surface ruptures.

关 键 词：GPS InSAR视线向 同震 三维形变 位错模型 

分 类 号：P315.725[天文地球—地震学]