Mapping the geological fault zone that triggered the Mw 6.1 Pasaman earthquake in Indonesia on the basis of gravity anomalies

• Autorzy: Yanis Muhammad , Ananda Riski , Adhari Muhammad Ridha , Paembonan Andri Yadi , Ghani Azman Abdul

Identyfikatory

DOI

10.14746/logos.2025.31.2.12

• Języki publikacji: EN

Abstrakty

EN

Indonesia’s Great Sumatran Fault (GSF) is well known for its destructive capability, having generated many moderate to strong earthquakes, causing damage. A better understanding of GSF characteristics is needed to mitigate future geological hazards in Sumatra and prevent unnecessary loss and damages. The present research aims to map the fault structure in West Pasaman, Indonesia, using the Topex satellite and global gravity model plus (GGM+). Residual anomalies from Bouguer data (50–80 mGal) show a continuous pattern between the confluence of the Angkola, Sumpur and Sianok fault segments in the Pasaman. The vertical and horizontal derivatives were also applied in order to clarify fault structure, which is demonstrated by high derivative anomalies (0.05–0.08 mGal/m) in the horizontal and 0.1 mGal/m in the vertical. Moreover, a cross sectional model from the 3D algorithm (Occam and Singular Value Decomposition) may show the presence of several segments/faults in the Pasaman region, such as the Angkola, Barumun and Sumpur faults with high-density values of ρ = 2.3–2.4 g/cm3. Based on results obtained, the use of Topex and GGM+ has provided an overview of the effectiveness of global gravity in mapping faults in the Pasaman region. It is a time-consuming, yet inexpensive method that can be applied to other areas, especially those that are difficult to reach.

Słowa kluczowe

EN

gravity satellite; GGM+; Topex; Great Sumatran Fault; Pasaman region

PL

satelita grawitacyjny; GGM+; Topex; Wielki Uskok Sumatry; region Pasaman

• Wydawca: Uniwersytet im. Adama Mickiewicza. Instytut Geologii
• Czasopismo: Geologos
• Rocznik: 2025
• Tom: Vol. 31, No. 2
• Strony: 151--166
• Opis fizyczny: Bibliogr. 56 poz.

Twórcy

autor

Yanis Muhammad

• Geophysical Engineering Department, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
• Tsunami and Disaster Mitigation Research Center (TDMRC), Universitas Syiah Kuala, Banda Aceh 23111, Indonesia

autor

Ananda Riski

• Geophysical Engineering Department, Faculty of Mining and Petroleum, Bandung Institute of Technology, Bandung 40132, Indonesia

autor

Adhari Muhammad Ridha

• Geophysical Engineering Department, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia

autor

Paembonan Andri Yadi

• Geophysical Engineering Department, Sumatera Institute of Technology, Lampung 35365, Indonesia

autor

Ghani Azman Abdul

• Department of Geology, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Federal Territory Malaysia

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