太原断陷盆地第四纪地层三维地质建模及隐伏断层初步分析
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摘要
“十五”期间开展的中国数字地震观测网络工程—“中国地震活动断层探测技术系统”是一项利国利民的大事。近百年来80%的地震财产损失和60%人口受灾发生在有活断层的城市中,因此查清城市地下隐伏地震活断层的分布及对其产生的危害,有效地降低地震造成的损失是值得研究的。
     太原市位于汾渭断陷带中段的太原断陷盆地内,一直被划入为全国地震的重点危险地区和备受关注的地区,因此“太原市活断层的探测与地震危险性评价”课题的研究,得到了山西省各级政府的大力支持与重视。
     本论文针对上述研究课题,搜集了大量的地质、地球物理及钻孔资料,利用将空间信息管理、地质解译、空间分析、地学统计以及三维图形可视化等工具结合起来的三维地质建模技术,对太原断陷盆地进行第四纪地层三维地质可视化建模,直观描述空间层面的起伏变化性,初步分析太原断陷盆地地层、断层分布及活动性。
     作者通过对大量的钻孔资料进行地层分层和数据整理后,建立了钻孔分层空间数据库;并利用ArcGIS强大的三维显示功能,以AO(ArcObjects)作为开发平台,设计了算法,实现了由钻孔构建地层三维垂直剖面与地层界面的三维可视化,进而根据收集到的钻孔资料获得了太原断陷盆地第四纪三维地层格架。
     最后基于所建立的太原断陷盆地第四纪地层三维模型,结合大量的地质资料,初步分析得出南堰断层(F_1)主要错断了第四纪早和中更新世地层;汾河东、西断层(F_2、F_3)主要错断了第四纪早和中更新世地层;新城-亲贤断层(F_4)主要错断了第四纪早、中更新世地层和晚更新世地层。
     论文研究成果实现了太原断陷盆地第四纪地层三维地质模型,是GIS在地学领域的探索和研究,具有一定的科研和应用价值,对其他城市活断层探测的开展有借鉴性的意义。
China network project of digital Earthquake observation—China seismic active fault surveying system is an event which is benefit for nation and people during the tenth five-year plan. Because 80% property damage and 60% population loss happened in some cities where the active fault existed, it is necessary to research the distribution and damage of seismic active fault hidden in the cities and to reduce the damage effectively.
     Taiyuan city is on the Taiyuan graben basin which is in the middle of Fen Wei graben belt. Taiyuan is a national earthquake danger area to which the government paid much attention in recent years. Therefore, the project of Taiyuan active fault surveying and earthquake risk estimation has been supported and paid much attention by ShanXi governments at the beginning.
     Based on the above-mentioned research subject, this paper has collected many kinds of geological and bore data and used the technology of three-dimensional visualize model integrated the spatial information administration, geology explanation, spatial analysis, geology statistic, three-dimensional picture visualization and so on to build a three-dimensional geologic model of Taiyuan graben basin in the quaternary period. This article directly describes the undulate variety of spatial stratum and primarily analyzes the stratum, faults distribution and activity of Taiyuan graben basin.
     The paper will build a spatial database of bore delamination through stratifying and tiding bore data. Using the powerful ArcGIS three-dimensional display function and making AO as the platform, it achieves the three-dimensional histogram of bore by designing algorithm; then it achieves three-dimensional visualization of stratum of three-dimensional vertical section and stratum interface and gets the three-dimensional stratum framework of quaternary period in Taiyuan graben basin by the collected bore materials.
     At last, based on the quaternary period 3-D geologic model of Taiyuan graben basin and combined all kinds of geological materials, we primarily analyze that Nanyan fault(F_1) breaks the stratum of Early Pleistocene and Medi-Pleistocene in the quaternary period; the strike of Fen River east and west fault (F_2,F_3) breaks the stratum of Early Pleistocene and Medi-Pleistocene on the quaternary period; the strike of Xincheng-Qinxian fault(F_4) breaks the stratum of Early Pleistocene, Medi-Pleistocene, and Late Pleistocene on the quaternary period.
     The achievement of this article is to build the 3-D geologic model of quaternary period in Taiyuan graben basin. It is the explorement and research of GIS in geology field. It is valuable on scientific research and application, and it can be used for reference to the development of active fault surveying project for other cities.
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