利用PS-InSAR技术监测山西北部地表形变场
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摘要
选用10景RADARSAT-2降轨宽幅雷达干涉数据,利用相干点目标PS-InSAR技术进行时间序列处理,获取了山西断裂带北部特定区域内2011—2014年地表形变场。结果表明:(1)断裂带中段的定襄县平原区域有较好的相干性,沿卫星视线向(LOS)的年形变速率最小值为-5±2 mm/a,最大值为-14±2 mm/a,显示断裂带附近以拉张正断层活动为主兼具逆时针差异运动特征;(2)地表形变特征的空间分布表明城市工业生产和生活抽取地下水是地表形变的主要诱因,最大沉降区域沿NNE向展布与研究区内断裂一致表明形变趋势受断裂带的影响明显;(3)利用已有的GPS复测资料对识别的PS点目标进行可靠性验证,结果表明两者的观测结果能够很好的吻合,证明该方法在监测面状区域形变场运动趋势的有效性。
The major advantage of PS-InSAR is inversion of ground surface slow change for a long time based on high coherent targets. Using 10 single look complex(SLC) RADARSAT-2 wide dates over north of Shanxi fault zone,the ground deformation field during 2011—2014 and ite details were obtained with PS-InSAR method. The results show that: (1) Between the two fault zones in Dingxiang, the coherence is better, most coherent point targets display lateral slip rate between-5±2 mm/a and-14±2 mm/a in LOS, which shows that this fault are mainly in tensional activities with reverse differential motion characteristics; (2) The spatial distribution of subsidence shows that groundwater extraction of industry and daily life are the main reasons, the major subsidence zones, trending NNE,coincide with the orientations of the fault zones, implying subsidence distribution is controlled by the fault; (3)Reliability verification is reasonable between existing GPS and PS point targets, the result is consistency and proved the effectiveness of this method.
The major advantage of PS-InSAR is inversion of ground surface slow change for a long time based on high coherent targets. Using 10 single look complex(SLC) RADARSAT-2 wide dates over north of Shanxi fault zone,the ground deformation field during 2011—2014 and ite details were obtained with PS-InSAR method. The results show that: (1) Between the two fault zones in Dingxiang, the coherence is better, most coherent point targets display lateral slip rate between-5±2 mm/a and-14±2 mm/a in LOS, which shows that this fault are mainly in tensional activities with reverse differential motion characteristics; (2) The spatial distribution of subsidence shows that groundwater extraction of industry and daily life are the main reasons, the major subsidence zones, trending NNE,coincide with the orientations of the fault zones, implying subsidence distribution is controlled by the fault; (3)Reliability verification is reasonable between existing GPS and PS point targets, the result is consistency and proved the effectiveness of this method.
引文
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[11]塔拉,陈阜超,周海涛,等.山西地区现代地壳垂直运动研究[J].大地测量与地球动力学,2014,34(1):32-37.
[12]杨博,刘志广,占伟,等.山西带近期水平运动状态[J].华北地震科学,2012,30(4):14-18.
[13]王秀文,宋美琴,杨国华,等.山西地区应力场变化与地震的关系[J].地球物理学报,2010,53(5):1127-1133.
[14]宋小刚,申星,姜宇,等.通过InSAR与GPS数据融合获取汶川地震同震三维形变场[J].地震地质,2015,37(1):222-231.
[15]罗三明,单新建,朱文武,等.多轨PSInSAR监测华北平原地表垂直形变场[J].地球物理学报,2014,57(10):3129-3139.
[16]王秀文,赵文星,杨国华.山西地堑系的最新水平运动[J].山西地震,2004(1):20-24.
[17]李腊月,许明元,何庆龙,等.山西断裂带断层现今活动特征及与中强震关系浅析[J].地震,2014,34(4):143-151.
[2]罗三明,杨国华,李陶,等.PSInSAR方法探测意大利拉奎拉地震形变过程分析[J].武汉大学学报(信息科学版),2012,37(5):602-605,609.
[3]屈春燕,单新建,宋小刚,等.基于PSInSAR技术的海原断裂带地壳形变初步研究[J].地球物理学报,2011,54(4):984-993.
[4]Ferretti A,Prati C,Rocca F.Permanent scatterers in SAR interferometry[J].IEEE Transactions on Geoscience and Remote Sensing,2001,39(1):8-20.
[5]Ferretti A,Prati C,Rocca F.Nonlinear subsidence rate estimation using permanent scatterers in differential SAR interferometry[J].IEEE Transactions on Geoscience and Remote Sensing,2000,38(5):2202-2212.
[6]Colesanti C,Ferretti A,Prati C,et al.ERS-ENVISAT permanent scatterers interferometry[C]//2003 IEEE International Geoscience and Remote Sensing Symposium.Proceedings.Toulouse,France:IEEE,2003,2:1130-1132.
[7]Wang T,Perissin D,Rocca F,et al.Three Gorges Dam stability monitoring with time-series InSAR image analysis[J].Science China Earth Sciences,2011,54(5):720-732.
[8]徐小波,屈春燕,单新建,等.基于PS-InSAR技术的断裂带地壳形变实验研究[J].地球科学进展,2012,27(4):452-459.
[9]王学忠,韩月萍,杨博.山西断陷带水平形变分析[J].山西地震,2009,7(3):8-12,42.
[10]刘瑞春,沈晓松,王翾潞.利用陆态网络基准站资料研究山西断陷带近期地壳形变特征[J].高原地震,2015,27(1):8-13.
[11]塔拉,陈阜超,周海涛,等.山西地区现代地壳垂直运动研究[J].大地测量与地球动力学,2014,34(1):32-37.
[12]杨博,刘志广,占伟,等.山西带近期水平运动状态[J].华北地震科学,2012,30(4):14-18.
[13]王秀文,宋美琴,杨国华,等.山西地区应力场变化与地震的关系[J].地球物理学报,2010,53(5):1127-1133.
[14]宋小刚,申星,姜宇,等.通过InSAR与GPS数据融合获取汶川地震同震三维形变场[J].地震地质,2015,37(1):222-231.
[15]罗三明,单新建,朱文武,等.多轨PSInSAR监测华北平原地表垂直形变场[J].地球物理学报,2014,57(10):3129-3139.
[16]王秀文,赵文星,杨国华.山西地堑系的最新水平运动[J].山西地震,2004(1):20-24.
[17]李腊月,许明元,何庆龙,等.山西断裂带断层现今活动特征及与中强震关系浅析[J].地震,2014,34(4):143-151.