Integrated C and L-band Satellite Interferometry for Investigation of Surface Deformation in Northern Vietnam fault zone

摘要

In this research, we employed satellite Differential Interferometric Synthetic Aperture Radar (DInSAR) in the area of interest to observe the surface deformation at high spatial density. DInSAR has proven to have potential capability to sub-centimeter in scale, thus it is well suited to observe deformation at depth of the inter-plate thrust motion along the major fault of this area, but also offer an opportunity to observe the seismic deformation at the inter-plate shallow thrust fault zone. In this study, we used images acquired from C-band data of ENVISAT and L-band data of ALOS/PALSAR on the experimental area so as to make the dual band interference procedure. It was helpful to continue to make observation as well as analysis. This study also produced the artificial ground control points using C-band time-delayed satellite active radar calibrator to carry out the precise mergence. Finally, it was considered that the materials which made the analysis would contrast with the other materials further. Based on the preliminary study results to show that the tectonic activities had the difference between the northern and southern sections of the Ailao-Red River sheared zone(A-RRSZ) in 1996~2004. Besides, its amount of variation had approximately 6-10 centimeters every year in the northern section. Second, on account of mountainous regions and plateaus, tropical monsoon climate, high temperature and numerous rainfall in northern Vietnam, it was observed the distribution of alluvia flushed around Red River delta, as well as the situation of local resident artificial activity to influence the surface change nearby Hanoi. Further, the change quantity was also estimated.