An outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth. In recent years, outcrop studies have become very important to understand the geology of the earth. The lack of studies on outcrops depends on the interpretations and observations at the surface of the earth only. Besides that, lack of specific physical value for the type of materials can cause misinterpretation of data. Therefore, 2-D resistivity and ground penetrating radar (GPR) were integrated to characterize the sedimentary outcrop. There are three study areas with the exposed outcrops located at northwestern Peninsular Malaysia, which are Bukit Chondong, Guar Jentik and Bukit Kukus. The 2-D resistivity survey was performed using SAS4000 Terrameter with Pole-dipole array configuration while for GPR, the frequency of the antenna used is 250 MHz. The resistivity data was processed by utilizing RES2DINV and Surfer 10 software of which the inversion results were displayed in a form of contouring values. The GPR data was processed using Ramac Groundvison software and was displayed in a form of GPR signal and exposed sedimentary outcrop. The results show that 2-D resistivity and GPR methods well characterized the geological features of sedimentary outcrops. The inversion model of 2-D resistivity shows the trend of contouring resistivity value is successfully matched with the outcrops’ geological features. The radargram from the GPR showed compatibility to sedimentary structures in the outcrops. Therefore, both methods will give great potential for further studies on sedimentary outcrop.
Keywords: 2-D resistivity, ground penetrating radar (GPR), features, Bukit Chondong, Guar Jentik, Bukit Kukus