利用小基线集技术(SBAS)监测泉州地区地表形变

Monitoring the ground deformation in Quanzhou area with small baseline subset(SBAS)

差分干涉测量(DInSAR)技术可用于监测厘米级甚至毫米级的地表形变。文中选用2007—2011年期间19景日本ALOS1/PALSAR数据,采用短基线集技术(SBAS)获取了该地区的形变时间序列和平均沉降速率。研究结果表明:泉州东南部地区整体上呈抬升态势,上升速率为5mm/a左右,主要是受到亚欧板块和西太平洋板块互相挤压作用的结果;泉州东南部有多处出现地表沉降,沉降的结果与泉州市统计的地区地下水开采数据相当吻合,因此沉降主要与地下水过度开采相关。

DInSAR can monitor the ground deformation at centimeter or even more minute levels. This paper choses 19 Japan ALOS1/PALSAR images from February 2007 to March 2011, using the small baseline subset of differential interferometry （SBAS） to obtain the time series deformation and the average sedimentation rate in this area. The result shows that： a. The southeast of Quanzhou is uplifted in the whole area, and the rising rate is about 5mm/a, which is mainly due to the mutual extrusion of Eurasian plate and western Pacific plate; b. There are some surface subsidence in the southeast of Quanzhou, which coincides well with the groundwater exploitation data of Quanzhou. So the settlement is mainly related to the over-exploitation of groundwater.