Siti Zulaikah, Adi Susilo, Ahmad Fauzi Pohan, Mohammad Habiby Idmi, Abdul Khodir Jaelani, Nordiana Mohd. Muztaza, Putera Agung Maha Agung, Muhammad Fathur Rouf Hasan
The disaster potential surrounding dam infrastructure is a critical issue in mitigation and spatial planning strategies. Fault zone activity has the potential to trigger ground movements and local earthquakes that may damage the dam structure, thereby posing a threat to the safety of surrounding communities. This research aims to examine the potential for disasters in fault zones surrounding the Karangkates Dam by interpreting magnetic data. Magnetic methods are used to identify the presence of faults based on the distribution of magnetic anomalies. Magnetic data were obtained from 130 measurement points around the Karangkates Dam, Malang Regency, using a Proton Procession Magnetometer G-856. Magnetic data processing begins with correcting field data to eliminate diurnal variations and IGRF (International Geomagnetic Reference Field) variations. Subsequently, the corrected data are interpolated and mapped to identify magnetic anomalies, which indicate the presence of subsurface objects or structures. The research findings indicate that low residual magnetic anomalies are correlated with fault locations identified on geological maps. The linear pattern of low anomalies can be correlated with the orientation of Southwest–Northeast and Northwest– Southeast faults around the Karangkates Dam. The linear pattern of low anomalies on the magnetic anomaly map can be interpreted as a fault line. In these areas, fault activity has altered the composition of minerals, which in turn causes the magnetic susceptibility of the rocks to become weak or non-magnetic. This study provides strategic information for local management for mitigation planning, maintenance, and monitoring of the sustainability of the Karangkates Dam. © 2025, Union of Iraqi Geologists. All rights reserved.
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Malang, Indonesia; IndonesiaDepartment of Physics, Faculty of Mathematics and Natural Sciences, Universitas Brawijaya, Malang, Indonesia; Center Study on Geosciences and Hazard Mitigation, Universitas Brawijaya, Malang, Indonesia; Department of Physics, Faculty of Mathematical and Natural Science, Universitas Andalas, Padang, Indonesia; School of Physics, Universiti Sains Malaysia, USM Penang, Malaysia; Department of Civil Engineering, Politeknik Negeri Jakarta, Depok, Indonesia; Graduate School, Universitas Brawijaya, Malang, Indonesia
