基于12景ALOS PALSAR卫星影像,利用InSAR的前沿技术,提取了2007～2010年滇西南镇康—永德一带的平均地壳形变速率和形变时间序列,并结合不同时段的水准和GPS监测结果,从三维角度研究了该区域现今的地壳运动特征。研究结果表明,水准资料显示的镇康—永德一带异常隆起区位于南汀河断裂带附近,范围沿北东—南西方向呈近椭圆形展布。这一地壳形变异常区在数十年尺度上表现为隆升(速率约2～3 mm/a),表明区域具备中强地震孕育的地壳形变背景。而在2007～2013的数年尺度上表现为大幅垂向形变波动,可能反映区域近年来地壳垂直运动比较活跃,应加强跟踪与监视。
On the basis of 12 ALOS PALSAR satellite images, we extracted the average crustal deformation velocity and the deformation time series of Zhenkang-Yongde region in southwest Yunnan during 2007 and 2010 by InSAR advanced technique.Then, combined with leveling and GPS observation results in different period, we studied the regional three dimensional deformation characteristics in the study area. The InSAR results showed that the abnormal uplift area in Zhenkang-Yongde region which was shown by the leveling data was located around the Nantinghe Fault, its range distributed from northeast to southwest with an oval pattern. The deformation anomaly area was uplifting with the velocity of 2～3 mm/a in several decades, which indicated that there had the crustal deformation background for moderate strong earthquake preparation in this area. However, it showed a vertical deformation fluctuant by a large margin during 2007 and 2013, which may reflect that the crustal vertical movement was active in the study area. Therefore, we should reinforce the deformation tracing and monitoring around the Zhenkang-Yongde region.
