The Red River Fault Zone is a gigantic slide-slip fault zone extending up to 1000 km from Tibet to South China Sea. It is complex, consisting of up to four strands, and is dominated by right-lateral strike-slip displacement. Evidence for an extensional component of displacement is strongest along the northern part of the fault, and decreases to the southeast, to zero southeast of a major bend in the fault. To detecting the deformation information of this fault is significant to study the activity of the fault. Differential Synthetic Aperture Radar Interferometry (D-InSAR) technology in the detection of surface deformation has been widely applied. The detection accuracy of the surface deformation can reach centimeter and even millimeter scale. Persistent scatterers (PS) technique is a classical deformation time series analysis methods. It was proposed to overcome the traditional D-InSAR technology's restrictive factors, including the temporal and spatial decorrelation and the atmospheric effects. In this study, we collected ENVISAT ASAR data that covering Red River Fault area. We analyzed the information of all the acquisitions and the background of the Red River fault to carry out the PS-InSAR technology. Based on the analyzing of the time-series acquired from the PS-InSAR method, we detected the displacements along the Red River fault with a comparable accuracy.
The differential interferometric SAR (D-InSAR) technique is an useful method to monitoring the surface deformation (Peradino, 2002), which was widely applied in the study of earthquake, volcano movement, crustal deformation and hill slide, with an accuracy of cm to mm magnitude (Massonnet, 2009). Recently, there are some successful practices on applying D-InSAR technologies in monitoring the crustal deformation (Lixia Gong, 2005). However, the traditional DInSAR technique has its limitations on detecting the long term crustal deformation, such as temporal and spatial de-correlation and atmospheric effects.