基于InSAR的海原—老虎山—毛毛山断裂带现今地壳形变特征

Present-day Crustal Deformation of the Haiyuan—Laohushan—Maomaoshan Fault Based on InSAR

本文利用107景L波段2007年至2011年的ALOS/PALSAR卫星影像,采用干涉图堆叠技术,基于GAMMA软件,利用影像数据公共区域的均值统计校正,首次获取海原—老虎山—毛毛山断裂带整体地区的平均地壳形变速度场,将大范围形变结果进行统一表达。沿断层方向形变结果表明,断裂带两侧存在明显差异运动,断层的运动性质为左旋,其中毛毛山-老虎山段的差异运动比较显著,在震情跟踪工作中要给予重视。另外,结合研究区域内长期GPS水平速度场,从多角度研究了区域现今地壳运动的特征。

We first obtained the average crustal deformation velocity field of the Haiyuan- Laohushan-Maomaoshan fault by interference stacking technology between 2007 and 2011, based on GAMMA and the mean statistical correction from public area of L band 107 ALOS/PALSAR satellite images data. In order to get the large area deformation, and integratedly expressed for wide-range deformation. The parallel fault deformation results show that there is an obvious difference on both sides of the fault which is left-lateral, the differential movement of Maomao-Laohu mountain was relatively outstanding and we should pay attention to it in the earthquake tracking work. The InSAR deformation also shows that the spatial extent and distribution characteristics of regional surface deforma- tion anomaly area. Furthermore, combining with the regional GPS horizontal velocity field, we studied various dimensioned deformation characteristics of the study area.