Nabila Sulaiman, M.M. Nordiana, Rosli Saad, Muhammad Syukri, Hazrul Hisham, Umi Maslinda, S.R. Ihsan
Gravity method can be used to identify any fault system by utilizing the difference of density exhibit from different materials in the earth. This study is to identify the Seulimeum fault system in Krueng Raya, Aceh Besar (Indonesia) using gravity method and correlate the result with the geological map and also to identify and understand the trend patterns or characteristics of the fault system based on the contrast of the bouguer anomaly contour map. A base station is fixed at one place and the reading is taken at the beginning and at the end of each survey to reduce the observed gravity value. The study area of 2.3 km × 1.7 km is divided into 2 boxes of approximately same size. Every station has interval of 200 m to 500 m randomly in the study area. The data is processed using the Microsoft Office Excel and Surfer8 software is used to map the bouguer anomaly contour map. The contour map shows that the lowest value of -33.5 mGal is in the northwest and the highest value of -21.5 mGal is in the southeast part of the area. Geological map of the area and the bouguer anomaly contour map is correlated and the Seulimeum fault system can be detected successfully using gravity method. The Seulimeum fault system stretches from the northwest to southeast at the upper part of the area and bends towards southeast at the latitude of 5.583 of the Krueng Raya area. The fault has characteristic of low, intermediate and high bouguer anomaly contrast on the contour map. © 2015 ejge.
Geophysics Section, School of Physics, Universiti Sains Malaysia, Penang, 11800, Malaysia; Geophysics Section, Department of Physics, Faculty of Sciences, Syiah Kuala University, Banda Aceh, Indonesia
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