中蒙地块的水平运动及应变特征
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摘要
GPS观测结果显示中蒙块体的位移速率较小,块体各部分的位移方向存在差别,说明块体有差异活动但不显著。连续应变场的应变率参量值在10-8/a以下;主压应力轴方向为NE74.6°,与该区内的浅源强震震源机制解的P轴方向基本一致。由应变产生的贝加尔湖裂谷的裂开速率为4.71mm/a,最大主应变率为34.34×10-9/a,张应变主轴方向NW310.49°,垂直于裂谷走向;嫩江断裂带和萝北-营口断裂带为走滑兼挤压或拉张活动断裂,位移速率和应变率都较小,活动性不显著。2003年8月16日巴林左旗5.9级地震和2004年3月24日东乌珠沁旗6.4级地震均发生在由1999~2003年GPS资料得出的多种应变速率参量的相对高值带和应变率高梯度带上。
The results from the GPS measurement show that the displacement rate of Sino-Mongolia block is small and the displacement directions of the parts of the block are different.It means that the activity is not obvious. The strain parameter values of the continuous strain field are under 10+-8/a. The direction of principal compressive strain axis of the block is NE74.6°, it is basically consistent with the direction of P axis of the focal mechanism solution of the shallow strong earthquake in this area.The split rate of the Baikal lake rift caused by the strain is 4.71 mm/a, the maximum principal strain rate is 34.34×10+-9/a, the direction of principal axis of tensile strain is NW310.49°, it is orthogonal to the strike of the rift. The Nenjiang fault zone and Luobei-Yingkou fault zone are the strike-slip faults with the compressive or extension activity, and the displacement and the strain rate are small, it means that their activities are not obvious. The Balinzuoqi earthquake of %M%s5.9, August 16, 2003, and Dongwuzhuqinqi earthquake of %M%s6.4, March 24, 2004, occurred in the zone of high rate value and high strain gradient zone from the GPS data in 1999-2003.
The results from the GPS measurement show that the displacement rate of Sino-Mongolia block is small and the displacement directions of the parts of the block are different.It means that the activity is not obvious. The strain parameter values of the continuous strain field are under 10+-8/a. The direction of principal compressive strain axis of the block is NE74.6°, it is basically consistent with the direction of P axis of the focal mechanism solution of the shallow strong earthquake in this area.The split rate of the Baikal lake rift caused by the strain is 4.71 mm/a, the maximum principal strain rate is 34.34×10+-9/a, the direction of principal axis of tensile strain is NW310.49°, it is orthogonal to the strike of the rift. The Nenjiang fault zone and Luobei-Yingkou fault zone are the strike-slip faults with the compressive or extension activity, and the displacement and the strain rate are small, it means that their activities are not obvious. The Balinzuoqi earthquake of %M%s5.9, August 16, 2003, and Dongwuzhuqinqi earthquake of %M%s6.4, March 24, 2004, occurred in the zone of high rate value and high strain gradient zone from the GPS data in 1999-2003.
引文
1 李延兴,杨国华,李智,等.中国大陆活动地块的运动与应变状态[J].中国科学(D辑),2003,33(增):65~81.1 Li Yanxing,Yang Guohua,Li Zhi,et al.Movement and strain conditions of active blocks in the Chinese mainland[J].Science in China(Series D),2003,33(Supp.):65-81.(in Chinese)
2 王琪,张培震,牛之俊,等.中国大陆现今地壳运动和构造变形[J].中国科学(D辑),2001,31(7):529~536.2 Wang Qi,Zhang Peizhen,Niu Zhijun,et al.Current crustal movement and tectonic deformation in Chinese mainland[J].Science in China(Series D),2001,31(7):529-536.(in Chinese)
3 江在森,马宗晋,张希,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):352~358.3 Jiang Zaishen,Ma Zongjin,Zhang Xi,et al.Horizontal strain field and tectonic deformation of China mainland revealed by preli minary GPS result[J].Acta Geophysica Sinica,2003,46(3):352-358.(in Chinese)
4 朱文耀,程宗颐,王小亚,等.中国大陆地壳运动的背景场[J].科学通报,19994 Zhu Wenyao,Cheng Zongyi,Wang Xiaoya,et al.Back-ground field of crustal movement in Chinese mainland[J].Chinese Science Bulletin,1999,4.(in Chinese)
5 黄立人,符养,段五杏,等.由GPS观测结果推断中国大陆活动构造边界[J].地球物理学报,2003,46(5):609~615.5 Huang Liren,Fu Yang,Duan Wuxing,et al.Active tec-tonic boundaries of the China mainlandinferredfrom GPS observations[J].Acta Geophysica Sinica,2003,46(5):609-615.(in Chinese)
6 许厚泽,熊熊.东北亚大陆地壳运动的GPS研究[J].大地测量与地球动力学,2004,24(4):1~6.6 Xu Houze and Xiong Xiong.Study on continental crust movement of northeast asia by GPS[J].Journal of Geod-esy and Geodynamics,2004,24(4):1-6.(in Chinese)
7 张培震,邓起东,张国民,等.中国大陆的强震活动与活动地块[J].中国科学(D辑),2003,33(增):12~20.7 Zhang Peizhen,Deng Qidong,Zhang Guomin,et al.Ac-tive blocks and strong earthquakes in mainland China[J].Science in China(Series D),2003,33(Supp.):12-20.(in Chinese)
8 李延兴,李智,张静华,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):222~231.8 Li Yanxing,Li Zhi,Zhang Jinghua,et al.Horizontal strain field in Chinese mainland and the surrounding are-as[J].Acta Geophysica Sinica,2004,47(2):222-231.(in Chinese)
9 江在森,张希,祝意青,等.昆仑山口西Ms8.1地震前区域构造变形背景[J].中国科学(D辑),2003,33(增):65~81.9 Jiang Zaisen,Zhang Xi,Zhu Yiqing,et al.Regional tec-tonic deformation setting before theMs8.1earthquake in the west of the Kunlun Mountain Pass[J].Sciencein Chi-na(Series D),2003,33(Supp.):163-172.(in Chinese)
10 郭良迁,张祖胜,李延兴,等.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):1068~1075.10 Guo Liangqian,Zhang Zusheng,Li Yanxing,et al.A study onthe strainfield associated withtheMs8.1Kun-lunshan earthquake[J].Acta Geophysica Sinica,2004,47(6):1068-1075.(in Chinese)
11 周硕愚,等.中国大陆东南边缘海现时地壳运动与地震动力学综合研究[J].地壳形变与地震,2001,21(1):1~13.11 Zhou Shuoyu,et al.Integrated research on curent crustal movement and earthquake dynamics in marginal sea,southeast of China continent[J].Crustal Deformation and Earthquake,2001,21(1):1-13.(in Chinese)
2 王琪,张培震,牛之俊,等.中国大陆现今地壳运动和构造变形[J].中国科学(D辑),2001,31(7):529~536.2 Wang Qi,Zhang Peizhen,Niu Zhijun,et al.Current crustal movement and tectonic deformation in Chinese mainland[J].Science in China(Series D),2001,31(7):529-536.(in Chinese)
3 江在森,马宗晋,张希,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):352~358.3 Jiang Zaishen,Ma Zongjin,Zhang Xi,et al.Horizontal strain field and tectonic deformation of China mainland revealed by preli minary GPS result[J].Acta Geophysica Sinica,2003,46(3):352-358.(in Chinese)
4 朱文耀,程宗颐,王小亚,等.中国大陆地壳运动的背景场[J].科学通报,19994 Zhu Wenyao,Cheng Zongyi,Wang Xiaoya,et al.Back-ground field of crustal movement in Chinese mainland[J].Chinese Science Bulletin,1999,4.(in Chinese)
5 黄立人,符养,段五杏,等.由GPS观测结果推断中国大陆活动构造边界[J].地球物理学报,2003,46(5):609~615.5 Huang Liren,Fu Yang,Duan Wuxing,et al.Active tec-tonic boundaries of the China mainlandinferredfrom GPS observations[J].Acta Geophysica Sinica,2003,46(5):609-615.(in Chinese)
6 许厚泽,熊熊.东北亚大陆地壳运动的GPS研究[J].大地测量与地球动力学,2004,24(4):1~6.6 Xu Houze and Xiong Xiong.Study on continental crust movement of northeast asia by GPS[J].Journal of Geod-esy and Geodynamics,2004,24(4):1-6.(in Chinese)
7 张培震,邓起东,张国民,等.中国大陆的强震活动与活动地块[J].中国科学(D辑),2003,33(增):12~20.7 Zhang Peizhen,Deng Qidong,Zhang Guomin,et al.Ac-tive blocks and strong earthquakes in mainland China[J].Science in China(Series D),2003,33(Supp.):12-20.(in Chinese)
8 李延兴,李智,张静华,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):222~231.8 Li Yanxing,Li Zhi,Zhang Jinghua,et al.Horizontal strain field in Chinese mainland and the surrounding are-as[J].Acta Geophysica Sinica,2004,47(2):222-231.(in Chinese)
9 江在森,张希,祝意青,等.昆仑山口西Ms8.1地震前区域构造变形背景[J].中国科学(D辑),2003,33(增):65~81.9 Jiang Zaisen,Zhang Xi,Zhu Yiqing,et al.Regional tec-tonic deformation setting before theMs8.1earthquake in the west of the Kunlun Mountain Pass[J].Sciencein Chi-na(Series D),2003,33(Supp.):163-172.(in Chinese)
10 郭良迁,张祖胜,李延兴,等.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):1068~1075.10 Guo Liangqian,Zhang Zusheng,Li Yanxing,et al.A study onthe strainfield associated withtheMs8.1Kun-lunshan earthquake[J].Acta Geophysica Sinica,2004,47(6):1068-1075.(in Chinese)
11 周硕愚,等.中国大陆东南边缘海现时地壳运动与地震动力学综合研究[J].地壳形变与地震,2001,21(1):1~13.11 Zhou Shuoyu,et al.Integrated research on curent crustal movement and earthquake dynamics in marginal sea,southeast of China continent[J].Crustal Deformation and Earthquake,2001,21(1):1-13.(in Chinese)
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