昆仑山Ms8.1地震对川滇地区地壳运动影响分析
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摘要
利用GPS观测结果,分析川滇地区地壳变形与昆仑山大地震的时间相关性,结果显示,川滇地区部分GPS站点与昆仑山地震震中周围站点的位移长度有很好的时间相关性。同时借助主成分分析方法,分析了昆仑山大地震引起川滇地区地壳变形的时空演化过程,得出以下初步结论:昆仑山大地震引起的空间变形范围较大,主要表现为南北向位移的变化。川滇地区受大震影响的范围主要集中在川西北地块,尤其是其南边界洱源断裂、小金河断裂附近,位于滇中地块的站点,几乎没有受到影响。川滇菱形块体以东、以北的站点受影响的程度明显减弱,川滇菱形块体东边界形成明显的变形分界线,而其西边界——澜沧江两侧的变形程度差异不大。昆仑山大地震引起的变形可能以川滇菱形块体东边界为主线,沿弧型剪切构造带向东南传递。
The correlation between crustal deformation in Sichuan-Yunnan region and Kunlun Mountain Ms8.1 earthquake was analyzed by use of GPS data.The results showed that there is good correlation between the displacements at a part of GPS stations in Sichuan-Yunnan area and at stations around the epicenter of the Kunlun Mountain Ms 8.1 earthquake.At the same time,the space-time process of deformation field of the Kunlun Mountain Ms8.1 earthquake in this region was analyzed with the principal component analysis(PCA).The conclusion are as follows.The deformation caused by Ms8.1 earthquake is extensive,whose affect is mostly NS displacement.The affected area are mostly in Northwest Sichuan block,specially near its south boundary such as Eryuan faults and Xiaojinhe faults,but,there is almost no effect in mid-Yunnan block.The effect weakens obviously in the north and east areas of Sichuan-Yunnan block.An obvious deformation boundary appears in the east boundaries of Sichuan-Yunnan block,but little deformation difference appeares in its west boundaries(Lancangjiang faults).The deformation caused by Kunlun Mountain strong earthquake probably transfer to the south-east words along the arc shearing tectonic faults,mainly along the east boundaries of Sichuan-Yunnan block.
The correlation between crustal deformation in Sichuan-Yunnan region and Kunlun Mountain Ms8.1 earthquake was analyzed by use of GPS data.The results showed that there is good correlation between the displacements at a part of GPS stations in Sichuan-Yunnan area and at stations around the epicenter of the Kunlun Mountain Ms 8.1 earthquake.At the same time,the space-time process of deformation field of the Kunlun Mountain Ms8.1 earthquake in this region was analyzed with the principal component analysis(PCA).The conclusion are as follows.The deformation caused by Ms8.1 earthquake is extensive,whose affect is mostly NS displacement.The affected area are mostly in Northwest Sichuan block,specially near its south boundary such as Eryuan faults and Xiaojinhe faults,but,there is almost no effect in mid-Yunnan block.The effect weakens obviously in the north and east areas of Sichuan-Yunnan block.An obvious deformation boundary appears in the east boundaries of Sichuan-Yunnan block,but little deformation difference appeares in its west boundaries(Lancangjiang faults).The deformation caused by Kunlun Mountain strong earthquake probably transfer to the south-east words along the arc shearing tectonic faults,mainly along the east boundaries of Sichuan-Yunnan block.
引文
[1]2007—2009年中国大陆地震大形势报告
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11马超,等.基于实测值分段线性内插模型的InSAR视线向同震位错分解——以青藏高原昆仑山Ms8.1地震为例[J].地震学报,2006,28(1):428-437.11Ma Chao,et al.A multi-segment analytic modeling of hy-pocentral geometric characteristic parameters of theMs8.1earthquake at the Kunlun Mountains[J].Chinese J.Ceo-phys,2006,49(2):428-437.(in Chinese)
12乔学军,等.昆仑山口西Ms8.1地震的地壳变形特征[J].大地测量与地球动力学,2002,22(4):6-11.12Qiao Xuejun,et al.Characteristics of crustal deformation re-lating toMs8.1Kunlunshan earthquake[J].Journal of Ge-odesy and Geodynamics,2002,22(4):6-11.(in Chi-nese)
13周佰艳,李晓东.海平面温度(SST)距平场的非线性重构[J].北京大学学报:自然科学版,2006,42(1):78-82.13Zhou Baiyan and Li Xiaodong.An nonlinear time series a-nalysis method for reconstruction of sea surface temperature(SST)anomalies[J].Acta Scientiarum Naturalium Uni-versitaties Pekinensis,2006,42(1):78-82.(in Chi-nese)
14Dong D,et al.Spatiotemporal filtering using principle com-ponent analysis and Karhunen-Loeve expansion approaches for regional GPS network analysis[J].JGR,2006,111:B03405,dol:10.1029/2005JB003806.
15杨少敏,王琪.昆仑山8.1级地震前中国大陆的构造应变背景[J].大地测量与地球动力学,2003,23(3):61-65.15Yang Shaomin and Wang Qi.Tectonic strain background in China continent before Kunlun mountainMs8.1earthquake[J].Journal of Geodesy and Geodynamics,2003,23(3):61-65.(in Chinese)
1江在森,等.昆仑山口西Ms81地震前区域构造变形背景[J].中国科学:D辑,2003,33(Supp.):163-172.1Jiang Zaisen,et al.Regional tectonic deformation back-ground before theMs8.1earthquake in the west of the Kun-lun mountains pass[J].Science in China(Series D),2003,33(Supp.):163-172.(in Chinese)
2江在森,等.GPS初步结果揭示的中国大陆水平应变场与构造变形[J].地球物理学报,2003,46(3):352-358.2Jiang Zaisen,et a1.Horizontal strain field and tectonic de-formation of China mainland revealed by preliminary GPS re-sult[J].Chinese Journal of Geophysics,2003,46(3):352-358.(in Chinese)
3顾国华,张晶,王武星.关于2001年昆仑山8.1级大地震前后中国大陆地壳水平运动的讨论[J].地震学报,2003,25(6):653-660.3Gu Guohua,Zhang Jing and Wang Wuxing.Horizontal crus-tal movement in Chinese mainland before and after the great Kunlun mountains earthquake ofMs8.1in2001[J].Acta Seismologica Sinica,2003,16(6):676-685.(in Chi-nese)
4顾国华,符养,王武星.1999至2001年中国大陆现今地壳水平运动[J].地震学报,2004,26(Supp.):58-63.4Gu Guohua,Fu Yang and Wang Wuxing.Horizontal crustal movement in Chinese mainland from1999to2001[J].Acta Seismologica Sinica,2004b,17(Supp.):53-60.
5郭良迁,张祖胜,李延兴.昆仑山口西Ms8.1级地震的形变应变场研究[J].地球物理学报,2004,47(6):1068-1075.5Guo Liangqian,Zhang Zusheng and Li Yanxing.A study on the strain field associated with theMs8.1Kunlunshan earth-quake[J].Chinese J.Geophys,2004,47(6):1068-1075.(in Chinese)
6任金卫,王敏.GPS观测的2001年昆仑山口西Ms8.1地震地壳变形[J].第四纪研究,2005,25(1):34-44.6Ren Jinwei and Wang Min.GPS measured crustal deforma-tion of theMs8.1Kunlun earthquake on november14th2001in Qinghai-Tibet Plateau[J].Quaternary Sciences,2005,25(1):34-44.(in Chinese)
7敬少群,吴云,乔学军.GPS时间序列及其对昆仑山口西8.1级地震的响应[J].地震学报,2005,27(4):394-401.7Jing Shaoqun,Wu Yun and Qiao Xuejun.GPS time series and its response toMs8.1Kunlunshan earthquake[J].Acta Seismologica Sinica,2005,27(4):394-401.(in Chi-nese)
8谭凯,王琪,申重阳.用大地测量数据反演2001年昆仑山地震[J].大地测量与地球动力学,2004,24(3):47-50.8Tan Kai,Wang Qi and Shen Chongyang.Using geodetic data to inverse co-seismic of2001Kunlun earthquake[J].Journal of Geodesy and Geodynamics,2004,24(3):47-50.(in Chinese)
9万永革,等.利用GPS和水准测量资料反演2001年昆仑山口西8.1级地震的同震滑动分布[J].地震地质,2004,26(3):393-404.9Wan Yongge,et al.Coseismic slip distribution of the2001west of Kunlun mountain pass earthquake inverted by GPS and leveling data[J].Sehmology and Geology,2004,26(3):393-404.(in Chinese)
10张晓亮,等.昆仑山口西Ms8.1地震同震形变场的模拟分析[J].大地测量与地球动力学,2007,27(2):16-21.10Zhang Xiaoliang,et al.Simulation and analysis of coseismic deformation field ofMs8.1earthquake in west to Kunlun mountain pass[J].Journal of Geodesy and Geodynamics,2007,27(2):16-21.(in Chinese)
11马超,等.基于实测值分段线性内插模型的InSAR视线向同震位错分解——以青藏高原昆仑山Ms8.1地震为例[J].地震学报,2006,28(1):428-437.11Ma Chao,et al.A multi-segment analytic modeling of hy-pocentral geometric characteristic parameters of theMs8.1earthquake at the Kunlun Mountains[J].Chinese J.Ceo-phys,2006,49(2):428-437.(in Chinese)
12乔学军,等.昆仑山口西Ms8.1地震的地壳变形特征[J].大地测量与地球动力学,2002,22(4):6-11.12Qiao Xuejun,et al.Characteristics of crustal deformation re-lating toMs8.1Kunlunshan earthquake[J].Journal of Ge-odesy and Geodynamics,2002,22(4):6-11.(in Chi-nese)
13周佰艳,李晓东.海平面温度(SST)距平场的非线性重构[J].北京大学学报:自然科学版,2006,42(1):78-82.13Zhou Baiyan and Li Xiaodong.An nonlinear time series a-nalysis method for reconstruction of sea surface temperature(SST)anomalies[J].Acta Scientiarum Naturalium Uni-versitaties Pekinensis,2006,42(1):78-82.(in Chi-nese)
14Dong D,et al.Spatiotemporal filtering using principle com-ponent analysis and Karhunen-Loeve expansion approaches for regional GPS network analysis[J].JGR,2006,111:B03405,dol:10.1029/2005JB003806.
15杨少敏,王琪.昆仑山8.1级地震前中国大陆的构造应变背景[J].大地测量与地球动力学,2003,23(3):61-65.15Yang Shaomin and Wang Qi.Tectonic strain background in China continent before Kunlun mountainMs8.1earthquake[J].Journal of Geodesy and Geodynamics,2003,23(3):61-65.(in Chinese)
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