华北北部地区现今地壳垂直形变特征与地震危险性分析
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摘要
通过对华北北部地区多期精密水准复测资料的处理分析,认为:首都圈西部的广大区域,出现了大面积、大量值的下降趋势,等值线的走向以NE向为主,与NWW向的张渤带近垂直相交。垂直变形的空间分布与构造活动关系密切,这种"南升北降"、"东升西降"的形变特征与"北高南低"地形显示的长期构造运动趋势不一致。研究区最西部地区出现了以阳高为中心的南北两侧相对上升,东西两侧相对下降,其最大差异值达26mm/a。这种形变形态与大同地震前的图像有某些相似,但其形变性质却完全不同(一升一降)。垂直形变的异常变化提示2008年华北北部地区的构造活动已从常态活动开始转向异态活动,有可能是强震孕育的信号。
Through the processing and analysis of multi-period precision leveling data in northern area of North China,it is found that the decline of large-number in a large-area has appeared in the western region to capital circle, the direction of contour lines is mainly to the NE, and they take vertical intersection with Zhangbo fault (NWW). There is a close relation of spatial distribution of vertical deformation to the tectonic activity, the characteristic of "up south-down north" and "up east-down west" is inconsistent with the long-term trend of tectonic movement of "high north-low south" , which is a "inverse inheritance movement". In the western region of the studied area, the quadrant-shaped distribution appears with Yanggao area as the center, relative increase of the south and north sides, relative decline of the east and west sides and the maximum difference value is 26 mm/a. This deformation state is similar to that before the Datong earthquake, however, the character of the deformation is absolutly different from Datong earthquake (up one-down another). Tectonic activities in the northern area of North China began to shift from the normal activities to the abnomal activities in 2008, it may be a strong earthquake signal.
Through the processing and analysis of multi-period precision leveling data in northern area of North China,it is found that the decline of large-number in a large-area has appeared in the western region to capital circle, the direction of contour lines is mainly to the NE, and they take vertical intersection with Zhangbo fault (NWW). There is a close relation of spatial distribution of vertical deformation to the tectonic activity, the characteristic of "up south-down north" and "up east-down west" is inconsistent with the long-term trend of tectonic movement of "high north-low south" , which is a "inverse inheritance movement". In the western region of the studied area, the quadrant-shaped distribution appears with Yanggao area as the center, relative increase of the south and north sides, relative decline of the east and west sides and the maximum difference value is 26 mm/a. This deformation state is similar to that before the Datong earthquake, however, the character of the deformation is absolutly different from Datong earthquake (up one-down another). Tectonic activities in the northern area of North China began to shift from the normal activities to the abnomal activities in 2008, it may be a strong earthquake signal.
引文
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2 方颖,等.张家口-渤海断裂带现今运动状态分析[J].大地测量与地球动力学,2008,(1):11-55.(Fang Ying,et al.Analysis of current movement of Zhangjiakou-Bohai fault zone[J].Journal of Geodesy and Geodynamics,2008,(1):11-15)
3 徐杰,宋长青,楚全芝.张家口-蓬莱断裂带地震构造特征的初步探讨[J].地震地质,1998,20(2):146-154.(Xu Jie,Song Changqing and Chu Quanzhi.Preliminary study on the seismotectonic characteristics of the Zhangjiak-ou-Penglai fault zone[J].Seismology and Geology,1998,20(2):146-154)
4 刘经南,等.中国大陆现今垂直形变特征的初步探讨[J].大地测量与地球动力学,2002,(3):1-5.(Liu Jingnan,et al.Preliminary research on characteristic of present-day vertical deformation of China mainland[J].Journal of Geode-sy and Geodynamics,2002,(3):1-5)
5 黄立人,马青,王若柏.中国大陆部分地区的地区垂直运动[J].大地测量与地球动力学,2004,(4):7-12.(Huang Liren,Ma Qing and Wang Ruobai.Vertical crustal movement in a part of China mainland[J].Journal of Geode-sy and Geodynamics,2004,(4):7-12)
6 王若柏,等.张家口-渤海地震构造带的地壳形变研究[J].地震地质,2004,12(4):586-595.(Wang Ruobai,et al.Discussion on characteristics of crustal deformation along the Zhangjiakou-Bohai seismotectonic zone[J].Seismology and Geology,2004,12(4):586-595)
7 马杏垣.中国岩石圈动力学地图集[M].北京:中国地图出版社,1989.(Ma Xingyuan.Lithospheric dynamics at-las of China[M].Beijing:China Cartographic Publishing House,1989)
8 杨国华,巩曰沐,杨春花.板内强震孕育过程中地形变图象及模式的研究[J].地震学报,1995,19(2):156-163.(Yang Guohua,Gong Yuemu and Yang Chunhua.Study of the crustal deforming image and mode during the strong earthquake preparation[J].Acta Seismologica Sinica,1995,19(2):156-163)
9 张祖胜,尤晓青.垂直形变速率梯度图的编绘[J].地震,1996,16(3):232-238.(Zhang Zusheng and You Xiao-qing.Charting map of vertical crustal deformation rate gradi-ent[J].Earthquake,1996,16(3):232-238)
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