C, the content of the investigation

C, the content of the investigation of the landslide geological environment condition should include the meteorological hydrology, topography and geomorphology, geological structure (neotectonic movement, earthquake) , stratum lithology, hydrogeological condition, construction condition and so on. On the basis of the collection and analysis of the regional geology and the previous survey data, the necessary survey and geological mapping should be carried out to the periphery. D, The survey and mapping of the deformation characteristics of the landslide, focusing on the survey and mapping of the deformation signs formed during the movement of the landslide body, such as the trailing edge of the slide steep wall (scarp) , arc-shaped pull-apart groups, anti-dip Landform, water-filled depression; The deformation microlandform of the landslide body such as bulge and bulge, shear outlet, water flowing and seepage zone, feather crack and dislocation on both sides, as well as displacement vector of the original building and electric pole on the landslide body etc. . It is necessary to investigate the distribution, cause and nature of the initial cracks caused by natural factors, construction slope excavation, landfill loading, highway slope cutting, canal and paddy field seepage, etc. . The observed signs of landslide deformation, elements and abnormal geological phenomena should be controlled by geological observation points and mapped on the map.