汶川Mw7.9地震InSAR同震形变场的校检

TEST OF INSAR COSEISMIC DEFORMATIONS FIELD OF WENCHUAN Mw7.9 EARTHQUAKE

用GPS实测结果对由ALOS PALSAR数据获取的汶川Mw7.9地震InSAR同震形变场结果进行校检和误差分析,结果表明InSARLOS观测值含有断裂两侧的常数误差和断层单侧双线性误差。经分析,断层两侧的常数误差由断层破裂两侧相位差引起,单侧双线性误差可能是卫星轨道偏移误差引起的。用GPS结果校准后的InSAR同震形变场与根据地震波反演给出的形变场基本符合,InSAR形变误差约为5cm。

The InSAR coseismic deformation interferogrames derived from ALOS PALSAR data caused by the Wenchuan MwT. 9 earthquake was tested by Using GPS measurements. There are constant errors between two sides of the rupture, and bilinear errors of one side of the rupture. It is believed that the constant errors is caused by the phase difference and bilinear errors by the satellite orbit offset error. The InSAR coseismic deformation field calibrated by GPS data are consistent with the forward model inverted from earthquake wave results, the error of calibrated InSAR coseismic deformation is about 5 cm.