The slopes of the left bank of the Soummam River (Bejaia) are subject of active land movement that threatens people and the rural economy. These landslides occur on surface ruptures along geological surface. The lands involved are unstable soils supplied with flysch, marl, uncemented colluvium materials. Instabilities are sustained even in summer by surface water circulation, largely from defective pipes, which highly saturate the clay loam component materials. 2D Electrical Resistivity Tomography survey tomography was carried out to delineate Geological and geophysical results on an unstable site of this region revealed superficial discontinuity surfaces that promote surface movement of low extension with large circular cutaway within the top of the unstable area. The fracture surface was identified in colluvium formation covering the flysch.


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