Abstract
In January 2019, land subsidence occurred in the Dengok road, Ponorogo Regency, KM.SBY-226. This phenomenon caused a significant road construction break. The treatment done so far tends to focus on repressive, not preventive measures. Therefore, early identification of the causes of this phenomenon needs to be carried out to determine more appropriate treatment steps. The vertical and lateral distribution of geological material and the depth of the slip plane can provide information on the cause of damage. The electrical resistivity tomography (ERT) method is used to obtain the subsurface geological information. Identification of surface geology was also carried out as reinforcement for ERT data. Data collection began by geoelectric data acquisition using a dipole-dipole configuration with three lines. Data processing was performed using Res2Dinv software with a topology interpretation model. Based on the ERT analysis and lithological interpretation results, we comprehend that the depth of the slip plane reaches 20-30 meters. It continues under the highway to the southern shoulder, causing a significant deformation of the highway infrastructure.
Published Version
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