THE SUBSURFACE INTERPRETATION USING SELF POTENTIAL METHOD, A CASE STUDY OF GOA JEPANG, BANDUNG

• Main Author: (NIM : 22107016), RAHMAWATI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/20423
• Institution: Institut Teknologi Bandung

The Self-Potential (SP) method is one of electrical methods which used natural electrical sources. Generally, the natural electrical sources are caused by noise and subsurface information of resistivity survey. The SP method has been widely used for groundwater flow survey and water leakage of dam. The orebody can be <br /> <br /> detected by measuring the voltage difference at two potential electrodes from the surface. The aims of study are to gain information about subsurface anomalies using SP method and determine the relationship between topographic effect and measurement result. The study was conducted at two lines with electode spacings at 5, 10, and 15 metres, respectively. The deposit model is assumed by the cave in Taman Hutan Raya, Ir. Juanda, Bandung. In order to create isopotential contour, the whole set of SP data is generated using Surfer 8. The modelling of SP data, which is assumed by cylinder model type, is proccessed using SPinv. The parameters modelling are the depth of deposit (h) and the distance from origin (D). The depth of deposit at line 1 and line 2 were located at 6.2 and 16.2 metres, respectively. The fitting curve between calculated and observed model at line 1 showed that the distances from origin (D) of deposit model, with electrode spacings at 10 and 15 metres, are located at 21.42 and 10.20 metres, respectively. The interpretation at line 2 showed that the depth of deposit (h) and the distance from origin (D) are located at 16.2 and 8.42 metres, respectively. This interpretation was similiar with the field condition at line 2.