The SINMAP model used soil parameters in the form of the cohesion value (c), internal friction angle (φ), and hydraulic conductivity (ks) for the prediction of soil movement based on the factor of safety (FS), while the indirect method used a literature review and field observations. The mapping of soil movement was examined by comparing an extension of the deterministic Soil Stability Index Mapping (SINMAP) method, and an overlay method with trigger parameters of soil movement. ![]() Areas with high landslide vulnerability could be at north and north-west of the study area. The soil and weathering layer can be accumulated above a curved bedrock interpreted as a layer that has a possibility to create slippage plane and produced a rotational slide and has the volume about 790,612m³. The first layer is characterized by a resistivity value of <9Ωm interpreted as soil saturated with water in the form of surface soil, the second layer is characterized by a resistivity value of 9-36Ωm is interpreted as a water-unsaturated soil layer, and the third layer is characterized by a resistivity value of 36-70Ωm interpreted as a base layer (bedrock) of andesitic-breccia. The result of resistivity data processing shows that the variation of subsurface resistivity value consists of three layers. This study aims to determine the structure of the subsurface layer using 1D and 2D resistivity methods, as well as to know the characteristics of slip-surface and type of ground movement that would occur. ![]() A Geophysical survey using resistivity method with Schlumberger and Dipole-dipole configuration had been used to determine subsurface landslide area at Penggung Purwosari Village area of Girimulyo, Kulonprogo Yogyakarta in Indonesia.
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