Measuring ground displacements from SAR amplitude images: application to the Landers earthquake
Measuring ground displacements from SAR amplitude images: application to the Landers earthquake
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DOI：
10.1029/1999gl900138
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发表时间：
1999-04-01
影响因子：
5.2
通讯作者：
Taboury, J
中科院分区：
文献类型：
--
作者：
Michel, R;Avouac, JP;Taboury, J
利用ERS SAR振幅图像，通过亚像素相关方法绘制地面位移。它产生了一个地面二维位移场与独立的测量约每128米的方位角和250米的范围。精度取决于图像的特性。对于Landers测试用例，1-sigma不确定度在距离上为0.8 m，在方位角上为0.4 m。我们表明，这种测量提供了一个地图的主要地表断层破裂准确到优于1公里和信息的同震变形可比的92 GPS测量。虽然不太准确，但这种技术比合成孔径雷达干涉测量法更可靠，并提供补充信息，因为干涉图只对距离上的位移敏感。
ERS SAR amplitude images are utilized to map ground displacements from a sub-pixel correlation method. It yields a ground two-dimensional displacement field with independent measurements about every 128m in azimuth and 250m in range. The accuracy depends on the characteristics of the images. For the Landers test case, the 1-sigma uncertainty is 0.8m in range and 0.4m in azimuth. We show that this measurement provides a map of major surface fault ruptures accurate to better than 1km and information on coseismic deformation comparable to the 92 GPS measurements available. Although less accurate, this technique is more robust than SAR interferometry and provides complementary information since interferograms are only sensitive to the displacement in range.