Integrated survey to identify potential groundwater aquifers in Jabungan Semarang using geoelectric and microtremor methods

Abstract

The morphology of the Jabungan Village area has relatively steep land conditions. In lithology, this area has a layer of soil composed of sandstone, claystone, and limestone. Based on direct observations in the field, it was found difficult to obtain clean water that could be used for consumption. The water available and used by the majority of residents is shallow well water, which is not of very good quality. There is only one deep well with a depth of 68 meters but according to residents, the water that is channeled to these houses smells unpleasant and feels oily. To detect the potential of ground water in this area, the geoelectric method is integrated using the microtremor method. Geoelectric measurements were made at 3 location points while microtremor measurements were carried out at 9 location points. Based on geoelectric resistivity and microtremor measurements, it can be concluded that the potential of subsurface water sources is below the JAB3 path or near Point 9 microtremor with soil layers composed of sand layers with resistivity values of 0.43-4.64 ohm-meter at depth > 70 meters with Vs value of 840 m/s with a Poisson's ratio value > 0.3, the more eastward the greater the value.