IDENTIFICATION OF FAULT WITH THE WENNERSCHLUMBERGER CONFIGURATION DC RESISTIVITY METHOD (CASE STUDY : LEMBANG FAULT)

• Main Author: HARTANTO , WAHYU
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24670
• Institution: Institut Teknologi Bandung

DC resistivity method is one of the geophysical methods that can be used to determine earth subsurface conditions. This method is done by injecting direct currents to the surface of the earth and then measuring the generated potential difference, thus the apparent resistivity values can be obtained for each measurement . This study aim is to identify the existence of Lembang fault using DC resistivity method. DC resistivity modelling was performed using a 1D forward modelling, 1D inversion modelling using the Singular Value Decompisition (SVD) method and 2D inversion modelling. This modelling program was applied to field data around Lembang fault. The data were obtained by using the Schlumberger-Wenner configuration on a single track consisting of three measurement ranges with a total path length of 660 meters. The 1D and 2D inversion modelling results show a small error rate. Based on 2D inversion modelling results, the fracture area was identified at a distance of 320 meters from the starting point of measurement characterized by low rock resistivity value (approximately 50 Ωm). Such low resistivity values can be interpreted as sedimentary rocks or the presence of water content which is characteristic of a fault plane. This also corresponds to the measurement results of magnetic methods in the same location