基于D-InSAR技术的伊朗巴姆地震地表形变监测

以伊朗巴姆地区为例,对伊朗巴姆地震造成的地表形变进行了差分干涉测量,得到了垂直向的同震三维形变场,并运用GIS三维分析技术对形变场进行了分析。实验结果表明,地震在巴姆城市的东侧造成了较大形变,在西侧也产生了微量形变。巴姆城市北部地块沉降,南部地块隆起。同时在巴姆城市南部可明显看到地震造成的断层。实验结果验证了基于C波段的SAR数据的D-InSAR技术在干燥地区监测地表形变方面的可行性。本文对产生去相关效应的原因进行了解释,认为对于干燥少植被的地区干涉效果较好。并指出,如果能够通过技术进步提高雷达干涉测量的精度并降低观测成本,同时将该技术与GPS、GIS等技术相结合,从而更好地研究形变机理,这将对地质灾害的研究产生重大意义。

Detecting Surface Deformation Produced by Bam Earthquake of Iran Based on D-InSAR

Taking Bam earthquake as an example, we generated the coseismic deformation map along the vertical direction caused by MS6.7 earthquake using InSAR technology and analyzed the deformation map with GIS 3-D technology. The results suggested that, the earthquake has produced large deformation on the east of Bam city, and small deformation on the west of Bam city. The northern block of Bam subsided and the southern block uplifted. The fault caused by Bam earthquake was shown clearly in the deformation map. This result verifies the feasibility of detecting surface deformation using D-InSAR technology based on C band SAR images. In this paper we discussed the decorrelation effect, and pointed out that the InSAR was suitable for the area which was dry and with little vegetation. Finally, we concluded out that in order to study the deformation mechanism better, the InSAR technique should be combined with other techniques, such as GPS and GIS.