Implementation of robust constraint inversion method on resistivity geoelectric data to study landslide precursors (case study : Sungai Lasi District and Gunung Talang Solok District, West Sumatra).

Landslides are natural disasters that have a major impact on the environment and surrounding communities every year. Even so, the impact of landslides can be reduced if the precursors of landslides are known through research. However, There are not much research has addressed to study this issue thoroughly. Indeed, many methods are used to study landslide precursors, one of which is to study landslide precursors based on resistivity data of rocks that form slopes or hills where landslides tend to occur. The rock resistivity data can be obtained by the Geoelectric Resistivity method, but the resistivity data that obtained through this method is apparent resistivity. The actual rock resistivity and thickness of the rock structure can be interpreted based on apparent resistivity using the Robust Inversion method. Thus, the purpose of this study is to describe the rock structure (resistivity and thickness) which has the potential as a precursor for landslides in Solok Regency, West Sumatra. The results showed that there were 10 landslide precursor points in Sungai Lasi District and 6 landslide precursor points in Gunung Talang sub-district that had the potential for landslides.