Landslide Analysis in Brau-Batu, East Java, Indonesia Based on Geoelectrical Resistivity Data

Abstract

The Brau landslide area is about 40Ha. The Brau landslide area is administratively located in the hamlet of Brau, Gunungsari village, Bumiaji sub-district, Batu city, East Java. Hamlet of Brau is famous as a tourism area and because of dairy farm in Batu city. Topographically, this area is located in a hilly area with a range of topographical heights between 1067m to 1202m or has a topographical elevation difference of 135m. With such topography, it is not surprising that this area has a potential vulnerability to landslide geological disasters. As a precaution against further landslides, residents are planned to relocate to other safer places. However, considering that the Brau area is a source of economic livelihood for local residents, residents want to stay there. To convince and ensure the vulnerability of this area, a study related to landslide variables is needed. One thing that can be done is to apply technology that can provide subsurface information on this disaster risk area. Therefore, in this study, geophysical research was carried out using the geoelectrical resistivity method to obtain information on the subsurface conditions of the landslide field in this area. The research was conducted to obtain information on the stability of the subsurface landslide field. From 60 VES data arranged in 12 cross sections, information is obtained that 6 cross sections or 50% cross sections are in stable condition. The location with the stable condition of the landslide field is then recommended as a location for the construction of a relocation site in the landslide area of Brau.