Magnitude and extent of six years of land subsidence in Shanghai revealed by JERS-1 SAR China data

Abstract

In this paper, authors have shown the capability of using InSAR techniques to map land subsidence phenomenon in both qualitative and quantitative terms. The problem of loss of coherence in Shanghai has also been assessed in this study with both the C-band ERS-1/2 and L-band JERS-1 SAR data. DInSAR qualitative analysis using JERS-1 differential interferograms revealed three stages of land subsidence in Shanghai from 1992 to 1998. The results indicated that the extent of land subsidence increased from 1992 through to 1998. It follows therefore that, activities taking place in the city might, in one way or the other, influence the progress of land subsidence in Shanghai as asserted by some researchers.