海原-六盘山断裂带现今构造变形特征
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摘要
基于1999—2007年GPS水平速度场资料,利用块体模型和跨断层速度剖面,并结合断裂带两侧应变场的分布,分析了海原-六盘山断裂带分段及整体运动变形特征。结果表明:托莱山与冷龙岭断裂的滑动性质为走滑兼挤压;金强河断裂变形最显著,剪切应变积累程度最高;毛毛山-老虎山断裂中的毛毛山段比老虎山段应变积累大;海原断裂(狭义)左旋走滑速率为5 mm/a,海原地震至今仍以蠕滑调整为主;六盘山北段有2.4 mm/a的挤压量,其挤压应变积累相对显著,而六盘山中南段变形不明显。海原-六盘山断裂带由西向东整体呈现出走滑兼挤压-走滑-挤压的构造转换样式。
On the basis of the GPS horizontal velocity field data in the period of 1999-2007,using the block model and GPS velocity profiles across faults and combining with the distribution of the strain rate field near it.we analyzed the present-day tectonic deformation characteristics of the Haiyuan-liupanshan fault zone from its segments and the entirety.The results show that the characteristics of the Tuolaishan fault and the Lenglongling fault is strike-slip with compression;The deformation of the Jinqianghe fault is the most distinct,and its shear strain accumulation is the highest.The strain accumulation on the Maomaoshan segment is larger than that of the Laohushan segment.The left slip rate of the special Haiyuan fault is 5 mm/a,and this fault is still creeping and adjusting since the Haiyuan earthquake occurrence.The compressive velocity across northern segment of the liupanshan fault is 2.4 mm/a,whose compressive strain accumulation is obvious.However the deformation of middle and south segment of the liupanshan fault is not distinct.The strike slip with compression-strike slip-compression transformation pattern presentes themselevs in the entire fault system from west to east.
On the basis of the GPS horizontal velocity field data in the period of 1999-2007,using the block model and GPS velocity profiles across faults and combining with the distribution of the strain rate field near it.we analyzed the present-day tectonic deformation characteristics of the Haiyuan-liupanshan fault zone from its segments and the entirety.The results show that the characteristics of the Tuolaishan fault and the Lenglongling fault is strike-slip with compression;The deformation of the Jinqianghe fault is the most distinct,and its shear strain accumulation is the highest.The strain accumulation on the Maomaoshan segment is larger than that of the Laohushan segment.The left slip rate of the special Haiyuan fault is 5 mm/a,and this fault is still creeping and adjusting since the Haiyuan earthquake occurrence.The compressive velocity across northern segment of the liupanshan fault is 2.4 mm/a,whose compressive strain accumulation is obvious.However the deformation of middle and south segment of the liupanshan fault is not distinct.The strike slip with compression-strike slip-compression transformation pattern presentes themselevs in the entire fault system from west to east.
引文
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2崔笃信,等.用GPS数据反演海原断裂带断层滑动速率和闭锁深度[J].地震学报,2009,31(5):516-525.(Cui Duxin,et al.Inversion of GPS data for slip rates andlocking depths of the Haiyuan fault[J].Acta SeismologicalSinica,2009,31(5):516-525)
3张晓亮,等.海原-六盘山弧型断裂及其附近最新构造变形演化分析[J].大地测量与地球动力学,2011,(3):20-24.(Zhang Xiaoliang,et al.Research on late tectonicdeformation evolvement of Huaiyuan-Liupanshan arc faultand its surrounding area[J].Journal of Geodesy and Geody-namics,2011,(3):20-24)
4 Wang H,et al.Slip rates and seismic moment deficits onmajor active faults in mainland China[J].J Geophys Res.,2011,116(B02405).
5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,eta1.Horizontal strain field in the Chinese mainland and itssurrounding areas[J].Chinese J Geophys.,2004,47(2):222-231)
6 Herring T A,King R W and McClusky S C.GAMIT Refer-ence Manual,Release 10.3.Massachussetts Institute Tech-nology,http://www-gpsg.mit.edu/～simon/gtgk/index.htm.
7 Herring T A,King R W and McClusky S C.GLOBK Refer-ence Manual,Release 10.3.Massachussetts Institute Tech-nology,http://www-gpsg.mit.edu/～simon/gtgk/index.htm.
8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 on crustal movement of Chinamainland and its application[J].Journal of Geodesy andGeodynamics,2005,(4):6-10)
9 Brendan J Meade and Bradford H Hager.Block models ofcrustal motion in southern California constrained by GPSmeasurements[J].Journal of Geophysical Research,2005,110(B03403).
10杜方,闻学泽,张培震.鲜水河断裂带炉霍段的震后滑动与形变[J].地球物理学报,2010,53(10):2355-2 366.(Du Fang,Wen Xueze and Zhang Peizhen.Post-seismic slip and deformation on the Luhuo segment of theXianshuihe fault zone[J].Chinese J Geophys.,2010,53(10):2355-2366)
11江在森,等.汶川8.0级地震前区域地壳运动与变形动态过程[J].地球物理学报,2009,52(2):505-518.(Jiang Zaisen,et al.The dynamic process of regional crus-tal movement and deformation before Wenchuan Ms8.0earthquake[J].Chinese Journal of Geophysics,2009,52(2):505-518)
12袁道阳,等.青藏高原东北缘晚第四纪活动构造的几何图像与构造转换[J].地质学报,2004,78(002):270-278.(Yuan Daoyang,et al.Geometrical imagery andtectonic transformation of late quaternary active tectonics innortheastern margin of Qinghai-Tibet Plateau[J].ActaGeologica Sinica,2004,78(002):270-278)
13武艳强,等.利用最小二乘配置在球面上整体解算应变场的方法及应用[J].地球物理学报,2009,52(7):1 707-1 711.(Wu Yanqiang,et al.The application andmethod of GPS strain calculation in whole mode using leastsquare collocation in sphere surface[J].Chinese J Geo-physics.,2009,52(7):1 707-1 711)
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