Muhammad Yanis, Muksin Umar, Faisal Abdullah, Andri Y. Paembonan, David Trianda, Azman Abdul Ghani
The Great Sumatran Fault, with a length of approximately 1900 km, has been the cause of significant earthquakes on the Island of Sumatra. This fault is divided into several segments, such as Seulimum and Aceh at the tip of Sumatra, which have produced many earthquakes. The Tripa Segment in the northern part of Aceh is predicted to cause earthquakes of Mw> 7 due to seismic activity that has not been released significantly. Gravity satellite is one of the fastest and cheapest methods for mapping regional fault structures and rock lithology below the surface. This study aims to visualize the Tripa segment using Topex gravity with a resolution of 1.8 km/px, which is integrated with seismicity data from the United States Geological Survey as an initial model for depth in density inversion. Residual anomalies processed with high-pass filtering can clearly show the Tripa segment's existence, characterized by a high Bouguer value of 30-50 mGal on the East side. In addition, the results of derivative techniques, such as vertical and horizontal, can also clarify the structure of the Tripa Segment, especially in the northern part of the research area; the use of this filter can also respond to local faults characterized by high and low Bouguer values in the same direction as the Tripa Segment. Furthermore, the tilt derivative can describe the total structure of the Tripa Segment from the West to the East, which is characterized by high derivative values > 1 rad/m, thus providing an overview of the effectiveness of the Topex gravity application for the study of the Tripa Segment in Southeast Aceh which can be used as an initial survey of faults in other areas. © 2025, Union of Iraqi Geologists. All rights reserved.
Geophysical Engineering Department, Syiah Kuala University, Darussalam, Banda Aceh, Indonesia; Tsunami and Disaster Mitigation Research Center, Syiah Kuala University, Banda Aceh, Indonesia; Physics Department, Syiah Kuala University, Darussalam, Banda Aceh, Indonesia; Geophysical Engineering Department, Sumatera Institute of Technology, Lampung, Indonesia; Department of Geology, Faculty of Science, University of Malaya, Federal Territory of Malaysia, Kuala Lumpur, Malaysia