基于Sentinel-1影像的2019~2020年河北隆尧地裂缝及周边形变监测与分析

为了解隆尧地裂缝目前的发育状况及其对周边地区的影响，采用2019-01~2020-12共31景Sentinel-1影像，基于SBAS-InSAR和Stacking InSAR技术获取隆尧地裂缝及其周边区域的形变时间序列及形变速率分布，进一步采用均质弹性空间模型研究隆尧地裂缝现今滑移状况。结果表明：1）隆尧地裂缝2019~2020年南北两侧的形变速率梯度差达4 cm/a，较2007~2011年5 cm/a的形变速率梯度差有所下降；2）固城店镇、魏家庄镇、官庄镇存在明显的周期性地表形变，但总体趋势仍为沉降；3）建模结果表明，隆尧地裂缝现阶段几乎破裂至地表，滑移速率为27 mm/a，与2007~2011年结果相比深度及滑移速率有所降低，说明现阶段隆尧地裂缝虽仍处于活跃状态，但活跃程度有所减缓。

Monitoring and Analysis of Fracture and Surrounding Deformation in Longyao,Hebei Province, 2019-2020 Based on Sentinel-1 Image

In this study, we use 31 Sentinel-1 images from January 2019 to December 2020 to interpret the current development of Longyao fissures and their impacts on the surrounding areas. Based on SBAS-InSAR and Stacking InSAR techniques, we obtain the time series and rate maps of deformation of Longyao fissures and their surrounding areas, and further study the current slip status of Longyao fissure using the homogeneous elastic space model. The results show that: 1) the stepwise difference of deformation rate between the north and south sides of Longyao ground fissure in 2019 to 2020 is 4 cm/a, which is lower than that of 5 cm/a in 2007 to 2011. 2) There is obvious periodic surface deformation in Guchengdian, Weijiazhuang and Guanzhuang town, but the general trend is still subsidence. 3) The modeling results show that the depth and slip rate of Longyao ground fissure are 0km and 27 mm/a at the present stage. Compared with the results from 2007 to 2011, both depth and slip rate are decreased. It indicates that Longyao ground fissure is still active, but activity has decreased.