Research to study the subsurface layer of the earth prone to landslides in Ulu Kasok Hill area, District XIII Koto Kampar, Kampar Regency, Riau Province has been done. The method used in this study is the one-dimensional Schlumberger configuration at geoelectric method. Data processing was done using Progress Software. The results of data processing show that at the 1st trackline there is a la…