Active tectonic deformation and its seismogeological hazards in the late Cenozoic anticline area
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摘要: 背斜是活动挤压构造区主要吸收地壳缩短变形的地质构造之一,活动背斜区的褶皱相关断层、褶皱陡坎、翼部地形倾斜、地质体缩短等构造变形引发的地震地质灾害是一个值得关注的科学和工程问题。褶皱区的活动构造研究表明,晚第四纪以来的活动背斜是一个复杂的构造系统,反映出挤压作用下产生的各类构造变形组合。本文立足于国内外对逆断层相关褶皱、褶皱相关断层、褶皱陡坎、背斜的隆升和侧向扩展等理论的介绍,结合典型活动背斜分布区的主逆冲断层、反冲断层、弯矩断层、弯滑断层、共轭剪切断层、褶皱陡坎等构造变形实例,探讨背斜区的各类活动断层的断错对建构筑物的破坏。特别是提出了活动背斜隆升、缩短和侧向扩展过程中,位于背斜两翼和倾伏端的工程场地的掀斜对建构筑物造成的地震地质灾害问题,以及褶皱的缩短、弯曲变形对跨越活动背斜区重大线状工程潜在的地震地质灾害问题。Abstract: Anticline is one of a geological structure that absorb the shortening deformation of the earth's crust in the active compressional tectonic area, the seismogeological disaster caused by fold-related fault, fold scarp, anticlinal limb tilting and shortening of geological body in active anticline is an issues of concern for science and engineering. The study of active structures in the fold area shows that the active anticline since the late Quaternary is a complex structural system, which reflects various types of tectonic deformation combinations produced by compression. This paper is based on the introduction of the theories of reverse fault-related folds, fold-related faults, fold scarps, uplift and lateral propagation of anticlines, combined with the structural deformation examples of typical active anticlines in China, such as main thrust fault, back reverse fault, bending moment fault, flexural-slip fault, conjugate shear fault and fold scarp, this paper discusses the structures failure by various active faults in anticlinal area. In particular, the problems of seismic and geological disasters caused by the tilting of engineering sites located at the both limbs and tips of an active anticline in the uplifting process, shortening and lateral propagation. And the potential seismogeological disaster problems caused by the shortening and bending deformation of folds for the major linear engineering across the active anticline.
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Key words:
- fold-related fault /
- fold scarp /
- fold growth /
- lateral propagation /
- seismogeological disasters
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