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《Chinese Journal of Geophysics》 2011-04
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The PSInSAR technique and its application to the study on crustal deformation of the Haiyuan fault zone

QU Chun-Yan,SHAN Xin-Jian,SONG Xiao-Gang,ZHANG Gui-Fang, ZHANG Guo-Hong,GUO Li-Ming National Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China  
Because of serious constraints from the phase decorrelations in time and space and the phase errors due to atmospheric delay,the current differential interferometric synthetic aperture radar(DInSAR) technique cannot work well in mapping the long-term accumulated small crustal deformation.To solve this problem,a new method called PSInSAR(Permanent scatterer InSAR) has been developed recently.In this paper,we introduce the principle,algorithm and data processing procedures of PSInSAR.Using a two-dimensional linear model of phase,this method makes regression analysis of differential interferometric phases at coherent point targets on images of time serial interferograms,eliminates phase errors from atmospheric delay,orbit residuals and topographic influence,and yields real phases associated with deformation.Finally it acquires the accumulated deformation and its rates at the coherent points on images.Then we take the Haiyuan fault zone as the experimental area to test this technique.We use 21 scenes of ENVISAT ASAR data from 2003 to 2009 and the PSInSAR technology presented above to examine the small crustal deformation on this fault zone.The result shows that most coherent point targets display a left lateral slip rate about 6~7 mm/a,the average cumulated displacement of these points in 2003~2009 is about 4.2cm,which is roughly in agreement with that from GPS measurements and geological investigations.This suggests that the PSInSAR technique is capable of detecting long-term accumulated crustal deformation on active faults.
【Fund】: 基本科研业务(DF-IGCEA-0608-2-12);; 地震行业专项(200708013);; “地震动力学”国家重点实验室开放基金(LED2008A06);; 国家自然科学基金(40074006)共同资助
【CateGory Index】: P227
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