小江断裂带的运动及应变积累特征研究
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摘要
利用1999—2001、2001—2004和2004—2007三个时段的GPS速度场数据,基于块体运动的线性模型(RELSM)研究了小江断裂带的运动与变形的时空特征,得出小江断裂的总体左旋走滑速率为3.0～7.1 mm/a。根据断裂带历史地震地表破裂分段,结合GPS速度剖面,研究了断裂带的分段应变积累时空特征,结果表明:1)小江断裂各个分段不同时间段的相对运动与变形方式有较好一致性,均呈现左旋走滑兼拉张的运动特征;2)RELSM得出小江断裂分段滑动的差异性,表现为沿断裂带的北段到南段的左旋滑动速率逐渐减小;3)小江断裂各段应变积累特征表明,北段高于中北段,中南段及南段不利于积累或积累水平低;4)小江断裂带北段为相对闭锁且剪切应变积累速度较高的异常区域。
Using the GPS velocity field data from 1999-2001,2001-2004 and 2004-2007 on short time scales,we studied the overall motion characteristics of Xiaojiang fault through linear model of block(RELSM),and reached the result that its average left-lateral slip rate is about 3.0~7.1 mm/a.According to the segmentation of surface rupture of fault due to historical earthquakes,we analyze the different characteristics of space-time of strain accumulation on every fragment by using the method of GPS velocity profile.The results indicated as follows.1)The sections in different time periods of Xiaojiang fault have better consistency on relative motion and deformation mode,are sinistral strike-slip and pull-apart movement characteristics.2)RELSM results show segment difference and decrease of slip rate from north to south.3)Strain accumulation features show,the northern section above middle north section,middle south section and the southern section are not conducive to the accumulation or low levels of it.4)The northern section of Xiaojiang fault zone is abnormal regions which was relatively closed and there was high rate of shear strain accumulation.
Using the GPS velocity field data from 1999-2001,2001-2004 and 2004-2007 on short time scales,we studied the overall motion characteristics of Xiaojiang fault through linear model of block(RELSM),and reached the result that its average left-lateral slip rate is about 3.0~7.1 mm/a.According to the segmentation of surface rupture of fault due to historical earthquakes,we analyze the different characteristics of space-time of strain accumulation on every fragment by using the method of GPS velocity profile.The results indicated as follows.1)The sections in different time periods of Xiaojiang fault have better consistency on relative motion and deformation mode,are sinistral strike-slip and pull-apart movement characteristics.2)RELSM results show segment difference and decrease of slip rate from north to south.3)Strain accumulation features show,the northern section above middle north section,middle south section and the southern section are not conducive to the accumulation or low levels of it.4)The northern section of Xiaojiang fault zone is abnormal regions which was relatively closed and there was high rate of shear strain accumulation.
引文
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11 Shen Z K,et a1.Contemporary crustal deformation aroundthe southeast borderland of the Tibetan Plateau[J].J Geo-phys Res.,2005,110:B11409,doi:10.1029/2004JB00342.
12王阎昭,等.基于GPS资料约束反演川滇地区主要断裂现今活动速率[J].中国科学(D辑),2008,38(5):582-597.(Wang Yanzhao,et al.Inversion of current move-ment rates of major faults in Sichuan-Yunnan area based onGPS-constrained[J].Science in China(SeriesD),2008,38(5):582-597)
2刘翔,等.2005年会泽5.3级地震与小江断裂地震活动关系研究[J].地震研究,2006,29(6):332-337.(LiuXiang,et al.Relation between the 2005 Huize M5.3 earth-quake and the seismicity of Xiaojiang fault[J].Journal ofSeismological Research,2006,29(6):332-337)
3闻学泽.小江断裂带的破裂分段与地震潜势概率估计[J].地震学报,1993,15(3):322-330.(Wen Xueze.Rupture segmentation and estimation about earthquake po-tential probability of Xiaojiang fault zone[J].Acta Seismo-logical Sinica,1993,15(3):322-330)
4钱晓东,秦嘉政.小江断裂带及周边地区强震危险性分析[J].地震研究,2008,31(4):354-361.(Qian Xxia-odong and Qin Jiazheng.Strong earthquake risk analysis ofXiaojiang fault zone and surrounding areas[J].Journal ofSeismological Research,2008,31(4):354-361)
5何宏林,方仲景,李坪.小江断裂带西支断裂南段新活动初探[J].地震研究,1993,16(3):91-298.(He Hong-lin,Fang Zhongjing and Li Ping.A preliminary approach tothe fault activity of southern segment on Xiaojiang westbranch fault[J].Seismology and Geology,1993,16(3):291-298)
6申旭辉,等.小江断裂带西支中段的走滑运动[A].国家地震局地质研究所.活动断裂研究2[C].北京:地震出版社,1993,41-54.(Shen Xuhui,et al.The strike-slipmovement of the middle west branch of Xiaojiang fault zone[A].Institute of Geology,China Earthquake Administration.Active faults research 2[C].Beijing:Seismological Press,1993,41-54)
7张希,等.川滇地区近期地壳运动的应变积累[J].大地测量与地球动力学,2007,(4):8-15.(Zhang Xi,et al.On strain accumulation of recent crust movement in Sichuan-Yunnan area[J].Journal of Geodesy and Geodynamics,2007,(4):8-15)
8申重阳,等.川滇菱形块体主要边界运动模型的GPS数据反演分析[J].地球物理学报,2002,45(3):352-361.(Shen Chongyang,et al.GPS inversion of kinematic model ofthe main boundaries of the rhombus block in Sichuan andYunnan[J].Chinese J Geophys.,2002,45(3):352-361)
9李延兴,等.中国大陆及周边地区的水平应变场[J].地球物理学报,2004,47(2):222-231.(Li Yanxing,et a1.Horizontal strain field in the Chinese mainland and its sur-rounding areas[J].Chinese J Geophys.,2004,47(2):222-231)
10闻学泽,等.小江和曲江-石屏两断裂系统的构造力学和强震序列的关联性[J].中国科学D辑:地球科学,2011,41(5):713-724.(Wen Xueze,et al.Tectonic dy-namics and correlation of major earthquake sequences of theXiaojiang and Quiang-Shiping fault systems,Yunan,China[J].Science in China Series:D:Earth Sciences),2011,41(5):713-724.doi:10.1007/s11430-011-4231-0.:
11 Shen Z K,et a1.Contemporary crustal deformation aroundthe southeast borderland of the Tibetan Plateau[J].J Geo-phys Res.,2005,110:B11409,doi:10.1029/2004JB00342.
12王阎昭,等.基于GPS资料约束反演川滇地区主要断裂现今活动速率[J].中国科学(D辑),2008,38(5):582-597.(Wang Yanzhao,et al.Inversion of current move-ment rates of major faults in Sichuan-Yunnan area based onGPS-constrained[J].Science in China(SeriesD),2008,38(5):582-597)
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