利用InSAR技术研究滇西南镇康—永德地区现今地壳形变特征
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摘要
基于12景ALOS PALSAR卫星影像,利用InSAR的前沿技术,提取了2007~2010年滇西南镇康—永德一带的平均地壳形变速率和形变时间序列,并结合不同时段的水准和GPS监测结果,从三维角度研究了该区域现今的地壳运动特征。研究结果表明,水准资料显示的镇康—永德一带异常隆起区位于南汀河断裂带附近,范围沿北东—南西方向呈近椭圆形展布。这一地壳形变异常区在数十年尺度上表现为隆升(速率约2~3 mm/a),表明区域具备中强地震孕育的地壳形变背景。而在2007~2013的数年尺度上表现为大幅垂向形变波动,可能反映区域近年来地壳垂直运动比较活跃,应加强跟踪与监视。
On the basis of 12 ALOS PALSAR satellite images,we extracted the average crustal deformation velocity and the deformation time series of Zhenkang-Yongde region in southw est Yunnan during 2007 and 2010 by InSAR advanced technique. Then,combined with leveling and GPS observation results in different period,we studied the regional three dimensional deformation characteristics in the study area. The InSAR results showed that the abnormal uplift area in Zhenkang-Yongde region which was show n by the leveling data was located around the Nantinghe Fault,its range distributed from northeast to southw est with an oval pattern. The deformation anomaly area was uplifting with the velocity of 2 ~ 3 mm / a in several decades,which indicated that there had the crustal deformation background for moderate strong earthquake preparation in this area. How ever,it showed a vertical deformation fluctuant by a large margin during 2007 and 2013,which may reflect that the crustal vertical movement was active in the study area. Therefore,we should reinforce the deformation tracing and monitoring around the Zhenkang-Yongde region.
On the basis of 12 ALOS PALSAR satellite images,we extracted the average crustal deformation velocity and the deformation time series of Zhenkang-Yongde region in southw est Yunnan during 2007 and 2010 by InSAR advanced technique. Then,combined with leveling and GPS observation results in different period,we studied the regional three dimensional deformation characteristics in the study area. The InSAR results showed that the abnormal uplift area in Zhenkang-Yongde region which was show n by the leveling data was located around the Nantinghe Fault,its range distributed from northeast to southw est with an oval pattern. The deformation anomaly area was uplifting with the velocity of 2 ~ 3 mm / a in several decades,which indicated that there had the crustal deformation background for moderate strong earthquake preparation in this area. How ever,it showed a vertical deformation fluctuant by a large margin during 2007 and 2013,which may reflect that the crustal vertical movement was active in the study area. Therefore,we should reinforce the deformation tracing and monitoring around the Zhenkang-Yongde region.
引文
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虢顺民,向宏发,周瑞琦,等.1999.滇西南龙陵—澜沧断裂带——大陆地壳上一条新生的破裂带[J].科学通报,44(19):2118-2121.
郝明.2012.基于精密水准数据的青藏高原东缘现今地壳垂直运动与典型地震同震及震后垂直形变研究[D].北京:中国地震局地质研究所.
季灵运,Zhong Lu,王庆良,等.2013.利用SBAS-In SAR技术研究印尼Agung火山的形变特征与岩浆房参数[J].地震研究,36(3)313-318.
刘智荣,黄静宜,洪顺英,等.2013.基于PS-In SAR技术的丽江断裂形变监测研究[J].地震研究,36(3):319-323.
王庆良,崔笃信,王文萍,等.2008.川西地区现今垂直地壳运动研究[J].中国科学(D辑),38(5):598-610.
吴中海,赵希涛,范桃园,等.2012.泛亚铁路滇西大理至瑞丽沿线主要活动断裂与地震地质特征[J].地质通报,31(2~3):191-217.
赵洪声,和宏伟,张立,等.2001.云南地震灾害特征分析[J].内陆地震,15(1):11-22.
Berardino P.,Fornaro G.,Lanari R.,et al..2002.A New Algorithm forSurface Deformation Monitoring based on Small Baseline DifferentialSAR Interferograms[J].Institute of Electrical and Electronics Engineers Transactions on Geosciences and Remote Sensing,40(11):2375-2383.
Biggs J.,Wright T.,Lu Z.,et al..2007.Multi-interferogram Method forMeasuring Interseismic Deformation:Denali fault,Alaska[J].Geophysical Journal International,170(3):1165-1179.
Emardson T.R.,Simons M.,Webb F.H..2003.Neutral AtmosphericDelay in Interferometric Synthetic Aperture Radar Applications:Statistical Description and Mitigation[J].J.Geophys.Res.,108(B5):2231,doi:10.1029/2002JB001781.
Jung H.S.,Lee,C.W.,Park J.W.,et al..2008.Improvement of SmallBaseline Subset(SBAS)Algorithm for Measuring Time-series Surfacedeformations from differential SAR interferograms[J].Korean Journal of Remote Sensing,24(2):165-177.
M7专项工作组.2012.中国大陆大地震中—长期危险性研究[M].北京:地震出版社.
Marshall S.T.,Funning G.J.,Owen S.E..2013.Fault Slip Rates andInterseismic Deformation in the Western Transverse Ranges,California[J].J.Geophys.Res.Solid Earth,118:4511-4534,doi:10.1002/jgrb.50312.
Wright T.B.,Parsons,Fielding E..2001.Measurement of InterseismicStrain Accumulation Across the North Anatolian Fault by SatelliteRadar Interferometry[J].Geophys.Res.Lett.,28:2117-2120,doi:10.1029/2000GL012850.
Zebker H.A.,Rosen P.A.,Hensley S..1997.Atmospheric Effects in Interferometric Synthetic Aperature Radar Surface Deformation andTopographic Maps[J].J.Geophys.Res.,102(B4):7547-7564,doi:10.1029/96JB03804.
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