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滑坡是三峡地区主要的地质灾害之一。三峡地区滑坡形成及发展的阶段性与新构造活动密切相关,与气候的冷暖变化也有密切关系。在系统收集三峡地区断裂活动同位素测试年龄的基础上,做出了断裂活动的年龄分布直方图。与滑坡年代分布对比发现,断裂活跃峰期与滑坡活跃峰期相间分布,后者明显滞后于前者;与气候期对比发现,断裂活跃期多对应于气候的由暖转冷阶段。综合分析表明,断裂活跃峰期的构造活动主要为后期滑坡的发生准备了充分的条件,而暖湿气候环境的强降水及地震活动,则是触发滑坡发生的主要因素。
Landslides are one of the major geological disasters in the Three Gorges area. The stage of the formation and development of landslides in the Three Gorges area are closely related to the neotectonic activities and are also closely related to the climate change. Based on collecting the age of fault activity isotope test in the Three Gorges area, the age distribution histogram of the fault activity was obtained. Compared with the age distribution of the landslide, it is found that the active peak of the fault distributes with the active peak of the landslide, the latter obviously lags behind the former. Compared with the climatic phase, the active phase of the fault corresponds mostly to the warm-cold phase of the climate. The comprehensive analysis shows that the tectonic activities at the active peak of the fault mainly prepare sufficient conditions for the later landslide occurrence. However, the strong precipitation and seismicity in the warm and humid climatic environment are the main factors that trigger the landslide.