The correlation of 2D-resistivity and magnetic methods in fault verification at northern Sumatra, Indonesia

• Main Authors: Kamaruddin Nur Aminuda, Rosli, Saad, Nordiana, M M, Azwin, I N
• Format: Conference Proceeding
• Language: English
• Subjects: Electrical resistivity; Geophysical methods; Geophysics; Magnetic anomalies; Magnetic methods; Segments; Sinkholes
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.4915178

The Great Sumatra Fault system was split into two sub-parallel lines or segments at the Northern Sumatra. This event is one of the impacts of powerful earthquakes that hit Sumatra Island especially one that occurred in 2004. These two sub-parallel segments known as Aceh and Seulimeum fault. The study is focused on the Seulimeum fault and two geophysical methods chosen aimed to compare and verified the result obtained respectively. 2-D resistivity method is a common geophysical method used in determination of near surface structures such as faults, cavities, voids and sinkholes. Meanwhile, the magnetic method often chosen to delineate subsurface structures, determine depth of magnetic source bodies and possibly sediment thickness. Three survey lines of resistivity method and randomly magnetic stations were carried out covering Krueng district. The resistivity data processed using Res2Dinv and result presented using Surfer software. The fault identified by the contrast of low and high resistivity value. Meanwhile, the magnetic data were presented in magnetic residual contour map and the extended fault system is suspected represent by the contrast value of the magnetic anomalies. Within suspected fault zone, the results of resistivity are tally with magnetic result.