The active faults deformation, with distinct temporal and spatial variations, requires long-term and effective monitoring. InSAR (interferometry synthetic aperture Radar), with the advantages of high efficiency, wide coverage and low cost, is one of the main technical means for ground surface deformation survey in recent years. In this paper, the small differential deformation of the main active faults in Tangshan urban area was monitored by the interferometric point target analysis. Two kinds of radar data were used: the Wide strip mode of RADARSAT-2 C-band with 30m spatial resolution and the Strip mode of TerraSAR-X X-band with 3 m spatial resolution. The results show that the differential deformation of Tangshan-Guye active fault is obvious with the maximum differential velocity of 2 mm/a. In this case, the deformation results from RADARSAT-2 C-band medium resolution data can clearly show the tiny differential deformation between the two sides of the active faults. However, TerraSAR-X X-band data, with shorter wavelength, is more obviously affected by the change of surface cover. Compared with this deformation, the vertical differential deformation between the two sides of active faults is too small to be separated from the TerraSAR results.
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