Pre- and Postcollapse Ground Deformation Revealed by SAR Interferometry: A Case Study of Foshan (China) Ground Collapse

Figure 5

(a) Annual deformation velocity map and (b) its error distribution before the formation of the collapse sinkhole. The red cross indicates the reference point, the red star denotes the location of the collapse sinkhole, the white circles show the metro station locations, the blue double line shows the metro line, and the red triangles show three subregions.

(a)

(b)