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首页> 外文期刊>Geophysical Research Letters >Surface displacements in the September 2005 Afar rifting event from satellite image matching: Asymmetric uplift and faulting
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Surface displacements in the September 2005 Afar rifting event from satellite image matching: Asymmetric uplift and faulting

机译：来自卫星图像匹配的2005年9月Afar裂谷事件中的地表位移：不对称隆升和断层

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摘要

Combining sub-pixel analysis of SPOT4 images with InSAR measurements, we generate 3D surface displacements for the September 2005 rifting event on the Dabbahu Segment in the Afar valley. The axis of rifting in the event is shifted to the east of the geomorphic rift. The horizontal displacements reveal 6 m of extension, and vertical displacements show asymmetric uplift of the flanks of the dike. Simple forward modelling indicates this asymmetry is due to the dike dipping 80° to the west towards the geomorphic rift. The boundary between eastward and westward displacements aligns with the transition between uplift and subsidence on the east in the north part of the segment, but on the west in the south. Normal faulting is not required on both sides of the instantaneous rift. East-dipping normal faulting on the west side of the instantaneous rift aligns with a west-dipping normal fault in the topography.
机译：将SPOT4图像的亚像素分析与InSAR测量相结合，我们为Afar山谷Dabbahu段上2005年9月的裂谷事件生成了3D表面位移。在这种情况下，裂谷轴线向地貌裂谷的东侧移动。水平位移显示了6 m的延伸，垂直位移显示了堤防侧面的不对称隆起。简单的前向建模表明，这种不对称性是由于堤坝向西向地貌裂谷倾斜80°。东向和西向位移的边界与该段北部的东部，但南部的西部与隆升和沉降之间的过渡相一致。瞬时裂谷的两侧均不需要正常故障。瞬时裂谷西侧的东倾正断层与地形中的西倾正断层对齐。

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