Understanding the Spatial-Temporal Characteristics of Land Subsidence in Shenzhen under Rapid Urbanization Based on MT-InSAR

Land subsidence is a common geological hazard in urban areas. It can be caused by human activities such as land reclamation and subway construction. However, rapid urbanization accelerate the progress of these activities. Therefore, spatial-temporal analysis provide guarantee for progress. In this study, Shenzhen, one fastest urbanizing cities China, selected continued monitoring. We collected 153 Sentinel-1A images from December 2015 to July 2021 utilized an interferometric point target (IPTA) method generate Shenzhen. Additionally, we analyzed relationship between typical progress: reclamation, transportation network, The results show that mostly occurs western area, with maximum rate -74.9 mm/a Qianhai Bay. Areas larger quaternary marine sediment thickness range 10∼20 m are more likely experience subsidence. Obvious (<-20 mm/a) along mainly occurred on Lines 11 Line 5, which inversely proportional distance metro. correlation coefficient -0.197. low road densities have high probability experiencing great A building construction Guangming district found. areas, percentage 43.48%.