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首页> 外文期刊>Remote Sensing of Environment: An Interdisciplinary Journal >Surface displacement of the M_w 7 Machaze earthquake (Mozambique): Complementary use of multiband InSAR and radar amplitude image correlation with elastic modelling
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Surface displacement of the M_w 7 Machaze earthquake (Mozambique): Complementary use of multiband InSAR and radar amplitude image correlation with elastic modelling

机译：M_w 7 Machaze地震（莫桑比克）的表面位移：多波段InSAR和雷达振幅图像相关性与弹性建模的互补使用

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摘要

In this paper we investigate the surface displacement related to the 2006 Machaze earthquake using Synthetic Aperture Radar Interferometry (InSAR) and sub-pixel correlation (SPC) of radar amplitude images. We focus on surface displacement measurement during three stages of the seismic cycle. First, we examined the co-seismic stage, using an Advanced SAR (ASAR) sensor onboard the Envisat satellite. Then we investigated the post-seismic stage using the Phase Array L-band SAR sensor (PALSAR) onboard the ALOS satellite. Lastly, we focussed on the inter-seismic stage, prior to the earthquake by analysing the L-band JERS-1 SAR data. The high degree of signal decorrelation in the C-band co-seismic interferogram hinders a correct positioning of the surface rupture and correct phase unwrapping. The post-seismic L-band interferograms reveal a time-constant surface displacement, causing subsidence of the surface at a ~ 5. cm/yr rate. This phenomenon continued to affect the close rupture field for at least two years following the earthquake and intrinsically reveals a candidate seismogenic fault trace that we use as a proxy for an inversion against an elastic dislocation model. Prior to the earthquake, the JERS interferograms do not indicate any traces of pre-seismic slip on the seismogenic fault. Therefore, slip after the earthquake is post-seismic, and it was triggered by the Machaze earthquake. This feature represents a prominent post-seismic slip event rarely observed in such a geodynamic context.
机译：在本文中，我们使用合成孔径雷达干涉测量法（InSAR）和雷达振幅图像的亚像素相关性（SPC）研究了与2006年Machaze地震有关的表面位移。我们专注于地震周期三个阶段的地表位移测量。首先，我们使用Envisat卫星上的Advanced SAR（ASAR）传感器检查了同震阶段。然后，我们使用ALOS卫星上的相控阵L波段SAR传感器（PALSAR）调查了震后阶段。最后，我们通过分析L波段JERS-1 SAR数据，将重点放在震前的地震之间。 C波段同震干涉图中的高度信号去相关性阻碍了表面破裂的正确定位和正确的相位展开。地震后的L波段干涉图显示出时间常数的表面位移，以约5 cm / yr的速率引起表面沉降。在地震发生后的至少两年时间里，这种现象继续影响着紧密的破裂场，并从本质上揭示了候选的地震成因断层迹线，我们将其用作对弹性位错模型进行反演的代理。在地震之前，JERS干涉图没有显示出在地震成因断层上的任何地震前滑动痕迹。因此，地震后的滑动是地震后的，并且是由Machaze地震触发的。该特征代表了在这种地球动力学环境中很少观察到的突出的地震后滑动事件。

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