Since 4 October 2019, the surface of region A-1 had begun to show a slight trend of subsidence, and then the funnel-shaped subsidence began to gradually form.
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Surface Subsidence Monitoring of Mining Areas in Hunan Province Based on Sentinel-1A and DS-InSAR.
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The sentences
As can be seen from Figure 4 , from January 2018 to December 2020, the surface of the four groups of mines in the study area was relatively stable as a whole, and the surface of a few small areas showed a trend of subsidence, with an annual average subsidence rate of about −19.6 mm/a∼20 mm/a.