汶川地震前后重庆地区地壳运动特征分析
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摘要
通过处理重庆GPS观测网2008年2月—2010年10月的观测数据,得到该地区12个测站的汶川地震同震位移、地震前后跨断层基线时间序列,及相对于WUHN站的水平运动场和区域无整体旋转基准下的速度场。结果表明,重庆地区的同震水平位移最大达到24 mm,最小达到7 mm;汶川地震后重庆地区地壳运动整体平稳。
By processing the observation data of the GPS network in Chongqing from February,2008 to October,2010,the following data were obtained: the coseismic displacement of 12 GPS stations in this area,the time series of cross-fault baseline length before and after Wenchuan earthquake,the horizontal movement field of Chongqing GPS stations related to WUHN and the horizontal movement rates of Chongqing under the regional NNR frame.The results show that the maximum of the coseismic horizontal displacement in Chongqing is 24 mm,and the minimum is 7 mm.After that event,the crustal movement in Chongqing has been steady as a whole.
By processing the observation data of the GPS network in Chongqing from February,2008 to October,2010,the following data were obtained: the coseismic displacement of 12 GPS stations in this area,the time series of cross-fault baseline length before and after Wenchuan earthquake,the horizontal movement field of Chongqing GPS stations related to WUHN and the horizontal movement rates of Chongqing under the regional NNR frame.The results show that the maximum of the coseismic horizontal displacement in Chongqing is 24 mm,and the minimum is 7 mm.After that event,the crustal movement in Chongqing has been steady as a whole.
引文
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2 Vigny C,et a1.Insight into the 2004 Sumatra-Andamanearthquake from GPS measurements in southeast Asia[J].Nature,2005,436:201-206.
3王解先,等.区域性GPS地壳运动监测网的数据处理[J].地壳形变与地震,1997,17(2):6-12.(Wang Jiex-ian,et al.Data processing of regional GPS for crust deformaction monitoring network[J].Crustal Deformation andEarthquake,1997,17(2):6-12)
4陆彩萍,王解先.GPS监测地壳运动数据处理[J].大地测量与地球动力学,2002,(4):56-60.(Lu Caiping andWang Jiexian.Data processing for GPS crust movement mo-nitoring network[J].Journal of Geodesy and Geodynamics,2002,(4):56-60)
5乔学军,等.中国GPS地壳运动监测网的精度分析与评定(1992-1996)[J].地壳形变与地震,1998,(1):52-56.(Qiao Xuejun,et al.Precision analysis and estimation ofGPS crustal movement monitoring net in China(1992-1996)[J].Crustal Deformation and Earthquake,2002,22(4):56-60)
6 Thomas Herring.MATLAB tools for viewing GPS velocitiesand time series[J].GPS Solutions,2003,7:194–199.
7国家重大科学工程“中国地壳运动观测网络”项目组.GPS测定的2008年汶川Ms 8.0级地震的同震位移场[J].中国科学(D辑:地球科学),2008,38(10):1 195-1206.(National Scientific Project“China Crustal MovementObservation Network”Project Team.Coseismic displace-ments from the 2008 Wenchuan M8.0 earthquake observedby GPS[J].Science in China Series D,2008,38(10):1195-1 206)
8杜瑞林,等.长江三峡GPS处理结果和应变背景场[J].武汉大学学报(信息科学版),2004,29(9):769-771.(Du Ruilin,et al.Results of the crustal deformation by GPSsurvey and horizontal strain rate fields in the Three Gorgesarea[J].Geomatics and Information Science of Wuhan Uni-versity,2004,29(9):769-771)
9杨国华,等.中国大陆整体无净旋转基准及其应用[J].大地测量与地球动力学,2005,(4):6-10.(Yang Guo-hua,et al.No-net-rotation crustal movement of China main-land and its application[J].Journal of Geodesy and Geody-namics,2005,(4):6-10)
10胡新康,等.区域无整体旋转基准的研究与应用[J].大地测量与地球动力学,2007,72(2):52-60.(Hu Xin-kang,et al.Research and application of regi*onal no-net-rotation reference frame[J].Journal of Geodesy and Geo-dynamics,2007,(2):52-60)
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