LAND SUBSIDENCE OF COASTAL AREA IN SOUTHERN TANGSHAN USING PSInSAR TECHNIQUE

The rapid development of ground subsidence in the southern Tangshan area is serious and has threated its world-class chemical industry base. Therefore, this paper examines the distribution and evolution of ground subsidence in the coastal area of the Southern Tangshan area, as well as the dominant factors of different subsidence regions. Based on the medium and high resolution radar data, the ground subsidence result in the coastal area of the southern Tangshan is obtained using PSInSAR technique. The results show that the ground subsidence funnel has a well correspondence with the groundwater funnel area. The ground subsidence is distributed along one side of a basement fault. The ground subsidence distribution of the Caofeidian Industrial Area is spotty or patchy, and its area range is small but the settlement gradient very large, which is extremely different from the ground subsidence caused by excessive exploitation groundwater. According to this survey, the geological characteristics are the basic condition of ground subsidence development, while over-exploitation groundwater and large-scale engineering disturbance are external power in Southern Tangshan area.