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12 September 2013 Near-field motion of the Haiyuan fault zone in the northeastern margin of the Tibetan plateau derived from InSAR permanent scatterers analysis
Chunyan Qu, Xinjian Shan, Xiaobo Xu, Guohong Zhang, Xiaogang Song, Guifang Zhang
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Funded by: National Key Laboratory for Earthquake Dynamics, National Natural Science Foundation of China
Journal of Applied Remote Sensing, Vol. 7, Issue 1, 073507 (September 2013). https://doi.org/10.1117/1.JRS.7.073507
Abstract
The Haiyuan fault zone is a major discontinuity in the northeastern margin of the Tibetan plateau. A magnitude 8.5 earthquake occurred there in 1920. Both geological investigations and GPS measurements show that this fault zone is still highly active, with a slip rate of 3 to 10  mm/year , exhibiting a large range of variance in both space and time. We attempt to use the permanent scatterers interferometric (PSI) synthetic aperture radar technique to better detect the near-field motion of this fault zone. We process and analyze 38 scenes of ENVISAT/ASAR images from two neighboring descending orbits using the PSI method. The results show a remarkable velocity gradient of about 5  mm/year across the central segment of the fault zone and a rate of about 5 to 6  mm/year on its eastern segment. The motion senses are consistent with a left-lateral strike slip. The motion histories of most PS points show a stable linear variation trend in time series. In addition to these motion features that agree with those from geological, GPS and other observations, the dense PS analysis also reveals spatially continuous variations of crustal motion around the fault zone.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Chunyan Qu, Xinjian Shan, Xiaobo Xu, Guohong Zhang, Xiaogang Song, and Guifang Zhang "Near-field motion of the Haiyuan fault zone in the northeastern margin of the Tibetan plateau derived from InSAR permanent scatterers analysis," Journal of Applied Remote Sensing 7(1), 073507 (12 September 2013). https://doi.org/10.1117/1.JRS.7.073507
Published: 12 September 2013
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Cited by 6 scholarly publications.
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KEYWORDS
Picosecond phenomena
Near field
Image segmentation
Synthetic aperture radar
Interferometry
Interferometric synthetic aperture radar
Motion analysis
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