Abstract
Satellite differential radar interferometry (DInSAR) has played a pivotal role in observing the ground deformation caused by seismic events in recent years. The Ms8.0 Wenchuan Earthquake occurred on 12 May 2008 have caused tremendous losses in lives and properties of the people in affected areas. In this paper, the surface co-seismic deformation field of the quake was mapped by the two-pass DInSAR technique. Several pairs of long strip PALSAR images and one pair of ASAR ScanSAR images were processed. The ascending (PALSAR) and descending (ASAR) results were combined to derive vertical and easting components of the co-seismic deformation field. According to the comparison between the vertical and easting deformation maps and the GPS observations, it is believed that the accuracy of the DInSAR measurement of the co-seismic deformation is affected by the atmospheric artifacts. Due to the reliable ASAR ScanSAR interferometric signals only exist in the area located at the southeast of the fault zone, more descending DInSAR results are required to obtain the vertical and easting co-seismic deformation field in the northeast.
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Acknowledgments
This research work has been supported by the Cooperative Research Centre for Spatial Information through Project 4.09, whose activities are funded by the Australian Commonwealth’s Cooperative Research Centres Programme. The Australian Research Council and the Australian Coal Association Research Program have been funding radar related studies by the team at the University of New South Wales (UNSW) during the last few years. The authors wish to thank the Earth Remote Sensing Data Analysis Center (ERSDAC) for providing ALOS PALSAR data. Also thank the European Space Agency (ESA) for providing ASAR data. They acknowledge the strong support from the International Association of Geodesy’s Sub-Commission 4.4 “Applications of Satellite & Airborne Imaging Systems” and the IAG Consortium for Mine Subsidence Monitoring. METI and JAXA retain the ownership of the ALOS PALSAR original data. The PALSAR Level-1.1 products were produced and provided to the CRC-SI/UNSW by ERSDAC, Japan.
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Zhang, K., Ng, A.HM., Ge, L., Dong, Y., Rizos, C. (2010). L-Band and C-Band Combined Interferometric Monitoring of the Wenchuan Earthquake. In: Chuvieco, E., Li, J., Yang, X. (eds) Advances in Earth Observation of Global Change. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9085-0_17
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DOI: https://doi.org/10.1007/978-90-481-9085-0_17
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