Geology and determination of potential groundwater sources using electrical resistivity imaging (E.R.I) at Kampung Sungai Terah, Gua Musang, Kelantan

Geological mapping of 25 km2 with the scale of 1:25,000 were conducted in Kampung Sungai Terah, Gua Musang, Kelantan. This area located at 4̊ 59’ 15.27” to 4̊ 56’ 02.10” North latitude and 101̊ 55’ 3.97” to 101̊ 58’ 56.84” East longitude. The objective of this research are to produce updated geological map and to identify the groundwater potential in limestone using Electrical Resistivity Imaging (E.R.I). Unit lithology in the research area can be divided into three main units. It is composed with limestone, shale, and slate from Gua Musang formation with age ranging from Permian to late Triassic. The geomorphology of the study area, Kampung Sungai Terah can be divided into two units of morphology which is medium and low relief morphology unit. In the study area, the main geological structure that occurred in the area is lineament features and joint structure. For the Electrical Resistivity Imaging (E.R.I), a pole dipole configuration array was used with 41 electrode and 200 meters spread length through four lines in the study area. The data of the survey recorded using ABEM Terrameter LS-1.The groundwater potential is based on resistivity value and chargeability value of pseudo section that has been process with RES2DINV software that give a two-dimensional (2D) resistivity data. The result from the E.R.I survey of groundwater potential shows that the area has a good potential source for groundwater where all pseudo section for all four line has a high value of resistivity but low in chargeability.