Landslide Investigations Using Direct Current Resistivity and Ground Penetrating Radar Methods: Case study Cikahuripan Vilage, Bandung

At present there are many natural hazards in Indonesia especially landslides. Therefore, investigating landslides become essential due to their impacts on greater risk of destructions and loss of life. The mitigation approach for investigating landslide is to determine potential slip zones of vulnerable area. As we know that landslides occur mostly in a certain region of Bandung, Indonesia. Hence, geophysical measurements were carried out to investigate the potential slip zone in the research area, Cikahuripan Village, Parongpong Subdistrict, Bandung. We conducted Ground Penetrating Radar (GPR) and Direct Current Resistivity (DCR) measurements along six profiles. The geophysical survey of GPR was conducted using a 100 MHz GPR shielded antenna frequency and was obtained of two long profiles, whilst DCR was conducted using dipole-dipole configuration with four long profiles. Based on the integration of all GPR and DCR data were processed yielding the quasi 3D resistivity cross-section. The research area shows three lithology layers which are sandy tuff, clay tuff and lava breccia with range of resistivity value of 19,5–74 Ωm, 5–19,5 Ωm and more than 74 Ωm, respectively. The reimaging geological cross-section corresponds to GPR and DCR models indicating a potential slip zone. This appears as clay lithology at the depth of 4–16 meters beneath the surface. GPR and DCR results show that models are mutually supportive and consistent with each other.