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The morphology of the North Algerian basins characterized by precarious stability constitutes an important issue for the development and the economy of many cities in the region. The landslide affecting the city of Azazga represents one of the most active and dramatic land movements experienced by the region in recent years. The city affected by the movement is situated at about 20 Kms in the East of the Wilaya of Tizi - Ouzou (in northern Algeria); the instability is located in a slope, composed of flysch (Azazga flysch are compounds of two terms of marly clay with small sandstone beds), with an inclination of about 13 °. Several factors have acted to activate this instability. Furthermore, water factor and geological conditions of this region are the main parameters of the susceptibility of the site to landslides.The Geographic Information Systems (GIS) are an effective alternative for the analysis of large-scale instabilities (such as Azazga landslides). GIS made for the site of Azazga allowed better management and interpretation of spatial data as well as good understanding of deformation mechanisms and the extent of this landslide. Geological profile has been defined for this slope using the results of spatial data analysis. Numerical modeling of this slope was then carried out, using the finite element software PLAXIS2D, with taking in consideration the effect of the water level. Those studies show the important influence of the position of water table on the activity of the landslide and the safety factor

Characterization, Modeling and Mapping of the landslide affecting the centre-town of Azazga (Algeria)