| D-InSAR技术应用于汶川地震地表位移场的空间分析 |
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| 引用本文： | 屈春燕,单新建,宋小刚,张桂芳,张国宏,郭利民,刘云华,韩宇飞.D-InSAR技术应用于汶川地震地表位移场的空间分析[J].地震地质,2010,32(2):175. |
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| 作者姓名： | 屈春燕 单新建 宋小刚 张桂芳 张国宏 郭利民 刘云华 韩宇飞 |
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| 作者单位： | 中国地震局地质研究所,地震动力学国家重点实验室,北京,100029 |
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| 基金项目： | 中国地震局地质研究所基本科研业务专项，国家自然科学基金，地震动力学国家重点实验室开放基金 |
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| 摘 要： | 基于星载合成孔径雷达差分干涉测量技术(D-InSAR),利用7个条带共112景日本ALOS/PALSAR raw格式雷达数据,采用两通差分干涉处理模式,获取了2008年5月12日汶川MS8.0地震发震断层周围约450km×500km区域的同震形变干涉纹图。通过对干涉纹图的定性分析,确定了非相干带的分布范围,据此对相位连续条带和相位不连续条带采用不同的相位解缠方案,实现了7个条带的成功解缠,获得了数值化的干涉形变场图像,并通过形变等值线和跨断层形变剖面线等方法对干涉形变场的空间分布和演化特征进行了分析。结果表明:汶川地震造成的地表形变场沿映秀-北川断裂带分布,形变范围很大,但主要集中在发震断层南北两侧各约100km的近场区。其中断层附近由西向东宽约3015km,长约250km的区域为非相干带,是本次地震中变形最强烈并伴有地表破裂发生的区域,其形变梯度已超出InSAR测度能力。在非相干带两侧宽度各约70km,具有清晰可辨连续完整并向发震断层收敛的包络状干涉条纹区域是次一级形变区,距离发震断层越近,形变梯度和幅度越大,其视线向位移为北盘沉降,南盘抬升。相对于数据条带南北边缘,北盘最大累积沉
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| 关 键 词： | D-InSAR 汶川MS8.0地震 地表形变 干涉 |
SPATIAL ANALYSIS OF COSEISMIC DISPLACEMENT FIELD OF THE WENCHUAN M_S 8.0 EARTHQUAKE DERIVED USING D-INSAR |
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| QU Chun-yan,SHAN Xin-jian,SONG Xiao-gang,ZHANG Gui-fang,ZHANG Guo-hong,GUO Li-min,LIU Yun-hua,HAN Yu-fei.SPATIAL ANALYSIS OF COSEISMIC DISPLACEMENT FIELD OF THE WENCHUAN M_S 8.0 EARTHQUAKE DERIVED USING D-INSAR[J].Seismology and Geology,2010,32(2):175. |
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| Authors: | QU Chun-yan SHAN Xin-jian SONG Xiao-gang ZHANG Gui-fang ZHANG Guo-hong GUO Li-min LIU Yun-hua HAN Yu-fei |
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| Institution: | QU Chun-yan SHAN Xin-jian SONG Xiao-gang ZHANG Gui-fangZHANG Guo-hong GUO Li-min LIU Yun-hua HAN Yu-fei(State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China) |
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| Abstract: | We used the radar data from the satellite ALOS/PALSAR of Japan and the differential interferometric synthetic aperture radar(D-InSAR)technology to derive the coseismic displacement field produced by the MS 8.0 Wenchuan,Sichucan Province,China earthquake on 12 May 2008.Based on processing SAR data of 7 tracks and 112 scenes by the two-pass method,we obtained the interferometric map of 450km×450km covering the causative fault and determined the distribution range of incoherent zones.Proper phase unwrapping was performed to these tracks of continuous and discontinuous phases,yielding digital image of the interferometric displacement field,which is analyzed by displacement contours and the profile across the fault.The result shows that the Wenchuan MS 8.0 earthquake has produced a vast area of surface deformation along the Yingxiu-Beichuan Fault,primarily concentrated in a near-field range of 100km wide on the both sides of the causative fault.In this field,the 250km-long and 15～35km wide |
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| Keywords: | D-InSAR |
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