Study on Dynamic Characteristics of Crustal Deformation in the Yunnan Area Using GPS
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摘要
Based on the GPS velocity field data of 1999-2007 and 2011-2013,we used the least squares configuration method and GPS velocity profile results to synthetically analyze the dynamic evolution characteristics of crustal deformation in the Yunnan area before and after the Wenchuan earthquake. The dynamic evolution of GPS velocity field shows that the direction is gradually changed from the south in the southern part of the SichuanYunnan block to the south-west in the southern Yunnan block and there is a clear relative motion characteristic near the block boundary fault zone. Compared with the GPS velocity of 1999-2007,the results of 2011-2013 also reflect segmental deformation characteristics of the block boundary fault zone. Southeast movement shows a significant increase,which may be related to crustal deformation adjustment after the Wenchuan earthquake. The dynamic evolution of strain parameters shows a pattern of"extension in the middle and compression at both ends"in the whole area and the distribution of deformation(shear,extension or compression)is closely related to the background motion and deformation characteristics of the main fault zone. Compared with the results of the period of 1999-2007,the extensional deformation zone of 2011-2013 is expanded eastward and southward. The compressional deformation of the eastern boundary(the Xiaojiang fault zone)of the Sichuan-Yunnan block is no longer significant,which is mainly concentrated in the northern section of the Xiaojiang fault zone and may be related to the post-seismic deformation adjustment of the Wenchuan earthquake. The GPS velocity profile results show that the left-lateral slip velocity of the Xiaojiang fault zone reduced gradually from north to south(10 mm/a-5 mm/a),and the width of the northern section is wider. The right-lateral slip rate of the Honghe fault zone is about 4 mm/a,and the deformation width is wider. The dynamic results show that the Wenchuan earthquake has little effect on the deformation modes of these two fault zones.
Based on the GPS velocity field data of 1999-2007 and 2011-2013,we used the least squares configuration method and GPS velocity profile results to synthetically analyze the dynamic evolution characteristics of crustal deformation in the Yunnan area before and after the Wenchuan earthquake. The dynamic evolution of GPS velocity field shows that the direction is gradually changed from the south in the southern part of the SichuanYunnan block to the south-west in the southern Yunnan block and there is a clear relative motion characteristic near the block boundary fault zone. Compared with the GPS velocity of 1999-2007,the results of 2011-2013 also reflect segmental deformation characteristics of the block boundary fault zone. Southeast movement shows a significant increase,which may be related to crustal deformation adjustment after the Wenchuan earthquake. The dynamic evolution of strain parameters shows a pattern of"extension in the middle and compression at both ends"in the whole area and the distribution of deformation(shear,extension or compression)is closely related to the background motion and deformation characteristics of the main fault zone. Compared with the results of the period of 1999-2007,the extensional deformation zone of 2011-2013 is expanded eastward and southward. The compressional deformation of the eastern boundary(the Xiaojiang fault zone)of the Sichuan-Yunnan block is no longer significant,which is mainly concentrated in the northern section of the Xiaojiang fault zone and may be related to the post-seismic deformation adjustment of the Wenchuan earthquake. The GPS velocity profile results show that the left-lateral slip velocity of the Xiaojiang fault zone reduced gradually from north to south(10 mm/a-5 mm/a),and the width of the northern section is wider. The right-lateral slip rate of the Honghe fault zone is about 4 mm/a,and the deformation width is wider. The dynamic results show that the Wenchuan earthquake has little effect on the deformation modes of these two fault zones.
Based on the GPS velocity field data of 1999-2007 and 2011-2013,we used the least squares configuration method and GPS velocity profile results to synthetically analyze the dynamic evolution characteristics of crustal deformation in the Yunnan area before and after the Wenchuan earthquake. The dynamic evolution of GPS velocity field shows that the direction is gradually changed from the south in the southern part of the SichuanYunnan block to the south-west in the southern Yunnan block and there is a clear relative motion characteristic near the block boundary fault zone. Compared with the GPS velocity of 1999-2007,the results of 2011-2013 also reflect segmental deformation characteristics of the block boundary fault zone. Southeast movement shows a significant increase,which may be related to crustal deformation adjustment after the Wenchuan earthquake. The dynamic evolution of strain parameters shows a pattern of"extension in the middle and compression at both ends"in the whole area and the distribution of deformation(shear,extension or compression)is closely related to the background motion and deformation characteristics of the main fault zone. Compared with the results of the period of 1999-2007,the extensional deformation zone of 2011-2013 is expanded eastward and southward. The compressional deformation of the eastern boundary(the Xiaojiang fault zone)of the Sichuan-Yunnan block is no longer significant,which is mainly concentrated in the northern section of the Xiaojiang fault zone and may be related to the post-seismic deformation adjustment of the Wenchuan earthquake. The GPS velocity profile results show that the left-lateral slip velocity of the Xiaojiang fault zone reduced gradually from north to south(10 mm/a-5 mm/a),and the width of the northern section is wider. The right-lateral slip rate of the Honghe fault zone is about 4 mm/a,and the deformation width is wider. The dynamic results show that the Wenchuan earthquake has little effect on the deformation modes of these two fault zones.
引文
Ding Kaihua,Xu Caijun,Zou Rong,Hu Youjian.Crustal movement and strain model of active blocks analyzed by GPS in Sichuan-Yunnan Region[J].Geomatics and Information Science of Wuhan University,2013,38(7):822-827(in Chinese with English abstract).
Dong D.,Herring T.A.,King R.W.Estimating regional deformation from a combination of space and terrestrial geodetic data[J].Journal of Geodesy,1998,72(4):200-214.
Fang Ying,Jiang Zaisen,Gu Guohua.Influence of Kunlun MountainMS8.1 earthquake on crustal movement in Sichuan-Yunnan Region[J].Journal of Geodesy and Geodynamics,2008,28(4):25-30(in Chinese with English abstract).
Hong Min,Zhang Yong,Shao Desheng,Wang Lingli,Wang Yan.Recent tectonic activity features of Yunnan Region[J].Journal of Seismological Research,2014,37(3):367-372(in Chinese with English abstract).
Huang Xiaojin,Wu Zhonghai,Li Jiacun,Nima Ciren,Liu Yanhui,Huang Xiaolong,Zhang Duo.Tectonic geomorphology and Quaternary tectonic activity in the northwest Yunnan rift zone[J].Geological Bulletin of China,2014,33(4):578-593(in Chinese with English abstract).
Ji Lingyun,Liu Liwei,Hao Ming.Crustal deformation characteristic of Zhenkang-Yongde region in southwest Yunnan observed by In SAR technology[J].Journal of Seismological Research,2015,38(1):84-89(in Chinese with English abstract).
Jiang Zaisen,Zhang Xi,Cui Duxin,Hu Yaxuan,Chen Wensheng,Wang Shuangxu,Chen Bing.Recent horizontal movement and deformation in the northeast margin of Qinghai-Tibetan block[J].Chinese Journal of Geophysics,2001,44(5):636-644(in Chinese with English abstract).
Jiang Zaisen,Liu Jingnan.The method in establishing strain field and velocity field of crustal movement using least squares collocation[J].Chinese Journal of Geophysics,2010,53(5):1109-1117(in Chinese with English abstract).
Li Xi.Study on Boundary Fault Rupture Characterics of the Sichuan-Yunnan Block at Different Development Stages in Yunnan Province[D].Beijing:Institute of Geology,China Earthquake Administration,2015(in Chinese with English abstract).
Liu Guangxun,Li Fangquan,Li Guirong.Active tectonics and state of stress in seismic region of North-West Yunnan Province,China[J].Seismology and Geology,1986,8(1):1-14(in Chinese with English abstract).
Maurin T.,Masson F.,Rangin C.,Min U.T.,Collard P.First global positioning system results in northern Myanmar:Constant and localized slip rate along the Sagaing fault[J].Geology,2010,38(7):591-594.
Shi Yaolin,Zhu Shoubiao.Discussion on method of calculating strain with GPS displacement data[J].Journal of Geodesy and Geodynamics,2006,26(1):1-8(in Chinese with English abstract).
Song Fangmin,Wang Yipeng.Active Faults Research Album in China Xiaojiang Active Faults[M].Beijing:Seismological Press,1998:257
Wang Lingli,Shao Desheng,Shi Faqi.The analysis of current crustal deformation and strain characteristics of active blocks in Yunnan region based on GPS[J].Seismological and Geomagnetic Observation and Research,2015,36(1):28-36(in Chinese with English abstract).
Wang Yizhao,Xiong Jiayong,Lin Yaoming.Some features on Yunnan geological structures[J].Yunnan Geology,1988,7(2):105-111(in Chinese with English abstract).
Wei Wenxin,Jiang Zaisen,Wu Yanqing,Zhao Jing.Motion characteristics of major faults in east boundary of Sichuan-Yunnan block obtained with GPS data[J].Geomatics and Information Science of Wuhan University,2012,37(9):1041-1044,1063(in Chinese with English abstract).
Wu Yanqiang,Jiang Zaisen,Yang Guohua,Wei Wenxin,Liu Xiaoxia.Comparison of GPS strain rate computing methods and their reliability[J].Geophysical Journal International,2011,185(2):703-717.
Wu Yanqing,Jiang Zaisen,Yang Guohua,Zhao Jing.Deformation characteristics of north section of North-South seismic zone in recent period[J].Geomatics and Information Science of Wuhan University,2012,37(9):1045-1048(in Chinese with English abstract).
Wu Yanqiang,Jiang Zaisen,Zhao Jing,Liu Xiaoxia,Wei Wenxin,Liu Qi,Li Qiang,Zou Zhenyu,Zhang Long.Crustal deformation before the 2008 WenchuanMS8.0 Earthquake studied using GPS data[J].Journal of Geodynamics,2015,85:11-23.
Xiang Hongfa,Han Zhujun,Guo Shunmin,Zhang Wanxia,Chen Lichun.Large-scale dextral strike-slip movement and asociated tectonic deformation along the Red-River fault zone[J].Seismology and Geology,2004,26(4):597-610(in Chinese with English abstract).
Yang Guohua,Wang Qi,Wang Min,Zhou Xiaoyan,Han Yueping.Current horizontal crustal movement and deformation characteristics in Yunnan Area[J].Journal of Geodesy and Geodynamics,2003,23(2):7-14(in Chinese with English abstract).
Yang Guohua,Han Yueping,Yang Bo.Discussion about the evolvement characteristics and the mechanism of the crustal horizontal movement and deformation field in Sichuan-Yunnan area[J].Journal of Seismological Research,2009,32(3):275-282(in Chinese with English abstract).78433,3
Zhang Xi,Jiang Zaisen,Wang Qi,Wang Shuangxu,Zhang Xiaoliang.Recent crust motion features in SichuanYunnan and their relationship to strong earthquakes[J].Journal of Geodesy and Geodynamics,2003,23(3):35-41(in Chinese with English abstract).
Zhang Peizhen,Gan Weijun,Shen Zhengkang,Wang Min.A coupling model of rigid-block movement and continuous deformation:patterns of the present-day deformation of China?s continent and its vicinity[J].Acta Geologica Sinica,2005,79(6):748-756(in Chinese with English abstract).
Zhang Peizhen,Xu Xiwei,Wen Xueze,Ran Yongkang.Slip rates and recurrence intervals of the Longmen Shan active fault zone and tectonic implications for the mechanism of the May 12 Wenchuan earthquake,2008,Sichuan,China[J].Chinese Journal of Geophysics,2008,51(4):1066-1073(in Chinese with English abstract).
Zou Zhenyu,Jiang Zaisen,Wu Yanqiang,Wei Wenxin,Fang Ying,Liu Xiaoxia.Dynamic characteristics of crustal movement in North-South Seismic Belt from GPS velocity field before and after the Wenchuan Earthquake[J].Chinese Journal of Geophysics,2015,58(5):1597-1609(in Chinese with English abstract).884 Earthquake Research in China
Dong D.,Herring T.A.,King R.W.Estimating regional deformation from a combination of space and terrestrial geodetic data[J].Journal of Geodesy,1998,72(4):200-214.
Fang Ying,Jiang Zaisen,Gu Guohua.Influence of Kunlun MountainMS8.1 earthquake on crustal movement in Sichuan-Yunnan Region[J].Journal of Geodesy and Geodynamics,2008,28(4):25-30(in Chinese with English abstract).
Hong Min,Zhang Yong,Shao Desheng,Wang Lingli,Wang Yan.Recent tectonic activity features of Yunnan Region[J].Journal of Seismological Research,2014,37(3):367-372(in Chinese with English abstract).
Huang Xiaojin,Wu Zhonghai,Li Jiacun,Nima Ciren,Liu Yanhui,Huang Xiaolong,Zhang Duo.Tectonic geomorphology and Quaternary tectonic activity in the northwest Yunnan rift zone[J].Geological Bulletin of China,2014,33(4):578-593(in Chinese with English abstract).
Ji Lingyun,Liu Liwei,Hao Ming.Crustal deformation characteristic of Zhenkang-Yongde region in southwest Yunnan observed by In SAR technology[J].Journal of Seismological Research,2015,38(1):84-89(in Chinese with English abstract).
Jiang Zaisen,Zhang Xi,Cui Duxin,Hu Yaxuan,Chen Wensheng,Wang Shuangxu,Chen Bing.Recent horizontal movement and deformation in the northeast margin of Qinghai-Tibetan block[J].Chinese Journal of Geophysics,2001,44(5):636-644(in Chinese with English abstract).
Jiang Zaisen,Liu Jingnan.The method in establishing strain field and velocity field of crustal movement using least squares collocation[J].Chinese Journal of Geophysics,2010,53(5):1109-1117(in Chinese with English abstract).
Li Xi.Study on Boundary Fault Rupture Characterics of the Sichuan-Yunnan Block at Different Development Stages in Yunnan Province[D].Beijing:Institute of Geology,China Earthquake Administration,2015(in Chinese with English abstract).
Liu Guangxun,Li Fangquan,Li Guirong.Active tectonics and state of stress in seismic region of North-West Yunnan Province,China[J].Seismology and Geology,1986,8(1):1-14(in Chinese with English abstract).
Maurin T.,Masson F.,Rangin C.,Min U.T.,Collard P.First global positioning system results in northern Myanmar:Constant and localized slip rate along the Sagaing fault[J].Geology,2010,38(7):591-594.
Shi Yaolin,Zhu Shoubiao.Discussion on method of calculating strain with GPS displacement data[J].Journal of Geodesy and Geodynamics,2006,26(1):1-8(in Chinese with English abstract).
Song Fangmin,Wang Yipeng.Active Faults Research Album in China Xiaojiang Active Faults[M].Beijing:Seismological Press,1998:257
Wang Lingli,Shao Desheng,Shi Faqi.The analysis of current crustal deformation and strain characteristics of active blocks in Yunnan region based on GPS[J].Seismological and Geomagnetic Observation and Research,2015,36(1):28-36(in Chinese with English abstract).
Wang Yizhao,Xiong Jiayong,Lin Yaoming.Some features on Yunnan geological structures[J].Yunnan Geology,1988,7(2):105-111(in Chinese with English abstract).
Wei Wenxin,Jiang Zaisen,Wu Yanqing,Zhao Jing.Motion characteristics of major faults in east boundary of Sichuan-Yunnan block obtained with GPS data[J].Geomatics and Information Science of Wuhan University,2012,37(9):1041-1044,1063(in Chinese with English abstract).
Wu Yanqiang,Jiang Zaisen,Yang Guohua,Wei Wenxin,Liu Xiaoxia.Comparison of GPS strain rate computing methods and their reliability[J].Geophysical Journal International,2011,185(2):703-717.
Wu Yanqing,Jiang Zaisen,Yang Guohua,Zhao Jing.Deformation characteristics of north section of North-South seismic zone in recent period[J].Geomatics and Information Science of Wuhan University,2012,37(9):1045-1048(in Chinese with English abstract).
Wu Yanqiang,Jiang Zaisen,Zhao Jing,Liu Xiaoxia,Wei Wenxin,Liu Qi,Li Qiang,Zou Zhenyu,Zhang Long.Crustal deformation before the 2008 WenchuanMS8.0 Earthquake studied using GPS data[J].Journal of Geodynamics,2015,85:11-23.
Xiang Hongfa,Han Zhujun,Guo Shunmin,Zhang Wanxia,Chen Lichun.Large-scale dextral strike-slip movement and asociated tectonic deformation along the Red-River fault zone[J].Seismology and Geology,2004,26(4):597-610(in Chinese with English abstract).
Yang Guohua,Wang Qi,Wang Min,Zhou Xiaoyan,Han Yueping.Current horizontal crustal movement and deformation characteristics in Yunnan Area[J].Journal of Geodesy and Geodynamics,2003,23(2):7-14(in Chinese with English abstract).
Yang Guohua,Han Yueping,Yang Bo.Discussion about the evolvement characteristics and the mechanism of the crustal horizontal movement and deformation field in Sichuan-Yunnan area[J].Journal of Seismological Research,2009,32(3):275-282(in Chinese with English abstract).78433,3
Zhang Xi,Jiang Zaisen,Wang Qi,Wang Shuangxu,Zhang Xiaoliang.Recent crust motion features in SichuanYunnan and their relationship to strong earthquakes[J].Journal of Geodesy and Geodynamics,2003,23(3):35-41(in Chinese with English abstract).
Zhang Peizhen,Gan Weijun,Shen Zhengkang,Wang Min.A coupling model of rigid-block movement and continuous deformation:patterns of the present-day deformation of China?s continent and its vicinity[J].Acta Geologica Sinica,2005,79(6):748-756(in Chinese with English abstract).
Zhang Peizhen,Xu Xiwei,Wen Xueze,Ran Yongkang.Slip rates and recurrence intervals of the Longmen Shan active fault zone and tectonic implications for the mechanism of the May 12 Wenchuan earthquake,2008,Sichuan,China[J].Chinese Journal of Geophysics,2008,51(4):1066-1073(in Chinese with English abstract).
Zou Zhenyu,Jiang Zaisen,Wu Yanqiang,Wei Wenxin,Fang Ying,Liu Xiaoxia.Dynamic characteristics of crustal movement in North-South Seismic Belt from GPS velocity field before and after the Wenchuan Earthquake[J].Chinese Journal of Geophysics,2015,58(5):1597-1609(in Chinese with English abstract).884 Earthquake Research in China
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