Aquifers mapping based on geoelectrical survey in the Karst Region of Pacitan, East Java, Indonesia Available to Purchase

Pacitan regencies of East Java, Indonesia, especially Donorojo, Punung, and Pringkuku sub-districts, are areas with karst landscapes. Geologically in this area, it is difficult to find water due to the nature of carbonate rocks that are easily dissolved. Hydrogeologically, the Pacitan karst system is part of the Wonosari Groundwater Basin where there are aquifers in which flow is through fissures, fractures, and channels with moderate productivity. Therefore, geophysical measurements are needed to determine the subsurface conditions where there is potential for aquifers. The purpose of thisstudy was to determine the location, depth, and thickness of the aquifer using the geoelectric method of dipole-dipole configuration with 6 (six) lines, the length of each line is 240 meters, and the distance between the electrodes is 5 meters. With a line length of 240 meters, the data was obtained from the depth of subsurface conditions up to a depth of 50 meters. The results of measurements and data processing with 2-dimensional inversion show that the presence of aquifers is spreadunevenly and at different depths. In some lines, underground cavities with varying depths are also found.