Imaging Conceptual Model Andesite Distribution Using Geoelectric And Vlf Methods

Research on identification of andesite distribution has been conducted in Kalisonggo area using geoelectric and very low frequency methods. This research purposed to determine of intrusion source and andesite distribution that included in Old Andesite Formation based on variations of subsurface resistivity and equivalent current density values. There are 5 lines VLF measurement with Southwestern - Northeast direction and 2 lines with Southeast - Northwets direction. Resistivity measurement are 6 points with half-current electrode separation are 400 meters in 1 km2 measuring area. Therefore, this paper presents an overview of resistivity data processing results that showed rock types, very low frequency processing result showed current density anomaly that indicated as andesite intrution source, and the cross-correlations result was estimated that andesite intrution source sited in 300 m from columnar joint that disclosed in Kalisonggo River with Northwest direction.