Fig. 2From: Surface deformation evolution in the Pearl River Delta between 2006 and 2011 derived from the ALOS1/PALSAR images(Modified from Li et al. 1991)Geological formation map of the Pearl River Delta (PRD). The colors inside the region outlined by the black line denote the Quaternary loose soil (Q4), bedrock (β), hidden karst (C), and soft soil. Curves of different colors represent coastlines of different time periodsBack to article page