ALOS PALSAR differential interferometry for mapping co-seismic deformation of the 2008 Wenchuan earthquake, China

Yunfeng Hu; Yifang Ban; Jiyuan Liu

doi:10.1117/12.847906

9 October 2009 ALOS PALSAR differential interferometry for mapping co-seismic deformation of the 2008 Wenchuan earthquake, China

Yunfeng Hu, Yifang Ban, Jiyuan Liu

Author Affiliations +

Proceedings Volume 7471, Second International Conference on Earth Observation for Global Changes; 74711A (2009) https://doi.org/10.1117/12.847906
Event: Second International Conference on Earth Observation for Global Changes, 2009, Chengdu, China

Abstract

Differential interferometric synthetic aperture radar (DInSAR) technique has been widely accepted as a powerful tool to map surface deformation. To quantitatively evaluate the surface displacement caused by Wenchuan Earthquake on 12 May 2008 in Sichuan Province, China, a series of interferograms were generated from 25 ALOS/PALSAR image pairs, and the surface displacement was then mapped. According to the wrapped differential interferogram, the main rupture fault was plotted with an orientation of North-East 47° and a spanning length of approximately 230 km. The serious affected region with area of 5,000 km² and the affected region with area of 250,000 km² were also mapped. Along the radar look of sight (LOS), it is estimated that the ground surface displaced approximated a maximum of 57 cm and 119 cm away from and towards the satellite respectively, i.e. the vertical displacement was a maximum of 73 cm and 150 cm down lift and uplift respectively. The capability of DInSAR technique and ALOS PALSAR data for co-seismic deformation mapping has been demonstrated and proved to be useful in the surface deformation applications. In addition, some limitations were discussed including the topographic, atmospheric, and orbital errors.

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Yunfeng Hu, Yifang Ban, and Jiyuan Liu "ALOS PALSAR differential interferometry for mapping co-seismic deformation of the 2008 Wenchuan earthquake, China", Proc. SPIE 7471, Second International Conference on Earth Observation for Global Changes, 74711A (9 October 2009); https://doi.org/10.1117/12.847906

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