SUBSURFACE MODELING USING GEOELECTRICAL RESISTIVITY METHOD IN JALIBAR AREA, ORO-ORO OMBO, BATU CITY, EAST JAVA
Keywords:
Geolistrik, resistivity, subsurface modeling, explorationAbstract
This study aims to model subsurface structures based on resistivity values in the Jalibar area, Oro-Oro Ombo, Batu City, East Java. The geoelectrical survey was conducted using the Schlumberger configuration of Vertical Electrical Sounding (VES). Data interpretation was carried out with IPI2Win, RockWorks, and ProGRES software. The results identified three main layers: the topsoil of weathered material or sandy clay with low to medium resistivity (10–100 Ωm), an intermediate layer of compact tuffaceous sand or sandstone with moderate to high resistivity (100–300 Ωm) that potentially serves as an aquifer zone, and a basement rock layer with very high resistivity (>1000 Ωm), interpreted as fresh andesite or basalt. The consistency across software indicates reliable subsurface modeling. This research confirms the effectiveness of geoelectrical methods in delineating geological structures, supporting mineral exploration and groundwater studies in volcanic terrains
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