Faisal Abdullah, Muhammad Yanis, Muhammad Ridha Adhari, Azman Abdul Ghani
The Great Sumatran Fault (GSF) extends approximately 1900 km from Lampung in Sumatra to Andaman Inlands and is divided into several segments on the island of Sumatra. The high-resolution fault map of Sumatra remains very limited, especially in the northern part of the region, making it very challenging to accurately assess earthquake risk mitigation. This research aims to improve the resolution of the Sumatra Fault structures, particularly in areas where seismic activities have not been significantly released, such as the Aceh and Seulimum segments, which are characterized by relatively low historical seismic releases, by applying the fusion processing approach on multi-source gravity data, such as EGM2008 (9 km), WGM2012 (2.5 km), and TOPEX/Poseidon (1.8 km), and integrating using normalization and fusion methods to construct a high-resolution Bouguer anomaly model for mapping the GSF fault. The fused Bouguer anomaly clearly delineates the Aceh and Seulimum fault segments trending SE–NW, characterized by anomaly amplitudes of 20 to 60 mGal. High-pass filtering enhances shorter-wavelength anomalies associated with local fault structures, while the vertical and horizontal derivatives further sharpen the fault boundaries. The integrated gravity data obtained using the fusion technique have increased the resolution of regional and local fault-structure mapping, providing insight into fault structure for earthquake risk assessment. © 2026, Chulalongkorn University, Faculty of Fine and Applied Arts. All rights reserved.
Department of Geophysical Engineering, Faculty of Engineering, Universitas Syiah Kuala, Indonesia; Physics Department, Universitas Syiah Kuala, Banda Aceh, Darussalam, 23111, Indonesia; Department of Geological Engineering, Faculty of Engineering, Universitas Syiah Kuala, Indonesia; Department of Geology, Faculty of Science, University of Malaya, Federal Territory, Kuala Lumpur, 50603, Malaysia
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