2008年于田7.3级地震前西昆仑地形变的GPS初步研究
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摘要
利用GPS观测资料计算并获取了2008年新疆西昆仑地区于田7.3级地震发生前的现今地壳运动速度场,通过速度场分布研究了区域内主要断层的活动速率。结果表明:震中以南的龙木错断裂呈左旋走滑性质的运动特征,走滑速率为1.2～2.5mm/a;震中以北的阿尔金左旋走滑断裂滑动速率为5mm/a;震中北西面的康西瓦断裂的左旋走滑平均速率约为3～7mm/a。区域应变场分布一定程度上受断裂带分布的影响。7.3级地震就位于断裂活动交汇的部位和最大剪应变率高值区的边缘。
Using the data of GPS measurements,the velocity field of present crustal movement before the Yutian MS7.3 earthquake in 2008 in the Western Kunlun tectonic zone,Xinjiang region,is calculated,and the active rates of regional maijor faults are estimated by analyzing the velocity field.The result shows that the active feature of Longmucuo fault at south of the earthquake epicenter is left-lateral strick sliping with rate of 1.2~2.5 mm/a,the sliping rate of Altyn-tagh left-lateral fault at north of the epicenter is about 5 mm/a,and the sliping rate of Kangxiwa left-lateral fault at northweast of the epicenter is 3~7 mm/a.The distribution of regional strain field is affected in some extent by the distribution of faults in the region.Yutian MS7.3 earthquake occurred at faults intersection zone and also the maximum shear strain rate zone.
Using the data of GPS measurements,the velocity field of present crustal movement before the Yutian MS7.3 earthquake in 2008 in the Western Kunlun tectonic zone,Xinjiang region,is calculated,and the active rates of regional maijor faults are estimated by analyzing the velocity field.The result shows that the active feature of Longmucuo fault at south of the earthquake epicenter is left-lateral strick sliping with rate of 1.2~2.5 mm/a,the sliping rate of Altyn-tagh left-lateral fault at north of the epicenter is about 5 mm/a,and the sliping rate of Kangxiwa left-lateral fault at northweast of the epicenter is 3~7 mm/a.The distribution of regional strain field is affected in some extent by the distribution of faults in the region.Yutian MS7.3 earthquake occurred at faults intersection zone and also the maximum shear strain rate zone.
引文
[1]Dewey J S,Shackleton R M,常承法,等.青藏高原的构造演化.[A]∥青藏高原综合地质考察队编.青藏高原综合地质考察报告[G].北京:科学出版社,1990:384-415.
[2]Tapponnier P,Xu Z,Roger F,et al.Oblique stepwise riseand growth of the Tibet[J].Science,2001,294:1671-1677.
[3]李海兵,Franck Valli,许志琴,等.喀喇昆仑断裂的变形特征及构造演化[J].中国地质,2006,33(2):239-255.
[4]王卫东,李少睿.利用地震矩张量反演阿尔金断裂带现今运动学特征[J].地震地质,1999,21(2):171-175.
[5]张培震,王敏,甘卫军,等.GPS观测的活动断裂滑动速率及其对现今大陆动力作用的制约[J].2003,10(U08):81-92.
[6]Shen Z-K,Wang M,Li Y,et al.Crustal deformation alongthe Altyn Tagh fault system,western China,from GPS[J].J.Geophys.Res.,2001,106:30607-30622.
[7]王晓强,王琪,程瑞忠,等.新疆伽师及临近地区现金地壳形变的GPS监测与研究[J].西北地震学报,2002,24(3):199-207.
[8]李铁明,邓志辉,吕弋培,等.鲜水河断裂带北段GPS测量及其运动特征[J].西北地震学报,2003,25(4):312-318.
[9]陈光保.GPS技术监测地壳运动的新进展[J].西北地震学报,2009,31(3):302-307,310.
[10]杨博,周伟,陈阜超.断裂区带变形分析方法及应用[J].西北地震学报,2010,32(3):215-219,225.
[11]李杰,王晓强,谭凯,等.北天山现今活动构造的运动特征[J].大地测量与地球动力学,2010,30(6):1-5.
[12]Molnar P,Burchfiel B C,Liang K,et al.Geomorphic evi-dence for active faulting in the Altyn Tagh and northern Ti-bet and qualitative estimates of its contribution to the conver-gence of India and Eurasia[J].Geology,1987,15:249-253.
[13]Yue Y J,Ritts B D,Graham S A,et al.Initiation and Long-term Slip History of the Altyn Tagh Fault[J].InternationalGeology Review,2001,43:1087-1093.
[14]徐锡伟,Tapponnier P,Van Der Woerd J,等.阿尔金断裂带晚第四纪左旋走滑速率及其构造运动转换模式讨论[J].中国科学(D辑),2003,33(10):967-974.
[15]Bendick R,Bilham R,Freymueller J T,et al.Geodetic Evi-dence for a low slip rate in the Altyn Tagh Fault and Con-straints on Asian Deformation[J].Nature,2000,404:69-72.
[16]尹光华,蒋靖祥,朱令人,等.阿尔金断裂乌尊硝段的现今活动速率[J].大地测量与地球动力学,2002,22(3):52-55.
[17]Wallace K,Yin G,Bilham R.Inescapable slow slip on theAltyn Tagh fault[J].Geophysical Research Letters,2004,31:L09613,doi:10.1029/2004GL019724.
[18]Yin A,Rumelhart P E,Butler R,et al.Tectonic history ofthe Altyn Tagh fault system in northern Tibet inferred fromCenozoic sedimentation[J].Geol.Soc.Am.Bull.,2002,114(10),1257-1295.
[19]Peltzer G,Tapponnier P,Armijo R.Magnitude of late Qua-ternary left-lateral displacements along the northern edge ofTibet[J].Science,1989,246:1283-1289.
[20]付碧宏,张松林,谢小平,等.阿尔金断裂系西段——康西瓦断裂的晚第四纪构造地貌特征研究[J].第四纪研究,2006,26(2):228-235.
[21]黄立人,王敏.构造地块的相对运动与应变[J].地壳形变与地震,1999,19(2),17-26.
[22]聂晓红.新疆于田7.4级地震震源机制结果[J].内陆地震,2008,22(21):114.
[23]万永革,沈正康,盛书中,等.2008年新疆于田7.3级地震对周围断层的影响及其正断层机制的区域构造解释[J].地球物理学报,2010,53(2):280-289.
[24]江在森,马宗晋,牛安福,等.GPS技术应用与中国地壳运动研究的方法及初步结果[J].地学前缘,2003,10(1):71-79.
[25]陈应涛,张国伟,鲁如魁,等.青藏高原西北缘郭扎错断裂40Ar39Ar年代学研究——阿尔金断裂西延的新证据[J].地质通报,2010,29(8):1129-1137.
[2]Tapponnier P,Xu Z,Roger F,et al.Oblique stepwise riseand growth of the Tibet[J].Science,2001,294:1671-1677.
[3]李海兵,Franck Valli,许志琴,等.喀喇昆仑断裂的变形特征及构造演化[J].中国地质,2006,33(2):239-255.
[4]王卫东,李少睿.利用地震矩张量反演阿尔金断裂带现今运动学特征[J].地震地质,1999,21(2):171-175.
[5]张培震,王敏,甘卫军,等.GPS观测的活动断裂滑动速率及其对现今大陆动力作用的制约[J].2003,10(U08):81-92.
[6]Shen Z-K,Wang M,Li Y,et al.Crustal deformation alongthe Altyn Tagh fault system,western China,from GPS[J].J.Geophys.Res.,2001,106:30607-30622.
[7]王晓强,王琪,程瑞忠,等.新疆伽师及临近地区现金地壳形变的GPS监测与研究[J].西北地震学报,2002,24(3):199-207.
[8]李铁明,邓志辉,吕弋培,等.鲜水河断裂带北段GPS测量及其运动特征[J].西北地震学报,2003,25(4):312-318.
[9]陈光保.GPS技术监测地壳运动的新进展[J].西北地震学报,2009,31(3):302-307,310.
[10]杨博,周伟,陈阜超.断裂区带变形分析方法及应用[J].西北地震学报,2010,32(3):215-219,225.
[11]李杰,王晓强,谭凯,等.北天山现今活动构造的运动特征[J].大地测量与地球动力学,2010,30(6):1-5.
[12]Molnar P,Burchfiel B C,Liang K,et al.Geomorphic evi-dence for active faulting in the Altyn Tagh and northern Ti-bet and qualitative estimates of its contribution to the conver-gence of India and Eurasia[J].Geology,1987,15:249-253.
[13]Yue Y J,Ritts B D,Graham S A,et al.Initiation and Long-term Slip History of the Altyn Tagh Fault[J].InternationalGeology Review,2001,43:1087-1093.
[14]徐锡伟,Tapponnier P,Van Der Woerd J,等.阿尔金断裂带晚第四纪左旋走滑速率及其构造运动转换模式讨论[J].中国科学(D辑),2003,33(10):967-974.
[15]Bendick R,Bilham R,Freymueller J T,et al.Geodetic Evi-dence for a low slip rate in the Altyn Tagh Fault and Con-straints on Asian Deformation[J].Nature,2000,404:69-72.
[16]尹光华,蒋靖祥,朱令人,等.阿尔金断裂乌尊硝段的现今活动速率[J].大地测量与地球动力学,2002,22(3):52-55.
[17]Wallace K,Yin G,Bilham R.Inescapable slow slip on theAltyn Tagh fault[J].Geophysical Research Letters,2004,31:L09613,doi:10.1029/2004GL019724.
[18]Yin A,Rumelhart P E,Butler R,et al.Tectonic history ofthe Altyn Tagh fault system in northern Tibet inferred fromCenozoic sedimentation[J].Geol.Soc.Am.Bull.,2002,114(10),1257-1295.
[19]Peltzer G,Tapponnier P,Armijo R.Magnitude of late Qua-ternary left-lateral displacements along the northern edge ofTibet[J].Science,1989,246:1283-1289.
[20]付碧宏,张松林,谢小平,等.阿尔金断裂系西段——康西瓦断裂的晚第四纪构造地貌特征研究[J].第四纪研究,2006,26(2):228-235.
[21]黄立人,王敏.构造地块的相对运动与应变[J].地壳形变与地震,1999,19(2),17-26.
[22]聂晓红.新疆于田7.4级地震震源机制结果[J].内陆地震,2008,22(21):114.
[23]万永革,沈正康,盛书中,等.2008年新疆于田7.3级地震对周围断层的影响及其正断层机制的区域构造解释[J].地球物理学报,2010,53(2):280-289.
[24]江在森,马宗晋,牛安福,等.GPS技术应用与中国地壳运动研究的方法及初步结果[J].地学前缘,2003,10(1):71-79.
[25]陈应涛,张国伟,鲁如魁,等.青藏高原西北缘郭扎错断裂40Ar39Ar年代学研究——阿尔金断裂西延的新证据[J].地质通报,2010,29(8):1129-1137.
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