This paper presents a broad-range study of the co-seismic deformation field of Wenchuan Ms8.0 earthquake by ScanSAR interferometry.The results show co-seismic displacements ranging from-19.8 on the footwall side of the seismogenic fault to 73.6 cm on the hanging-wall side,or from-22.4 to 77.2 cm with atmospheric-delay correction by MODIS.These results differ from the GPS line-of-sight results by 4.58 cm to 2.78 cm,respectively,on the average.We could not obtain the displacements near the earthquake-rupture zone due to incoherence problem.
