Mapping Lateral Offsets Along the Aceh Fault Zone of the Great Sumatran Fault: An Examination of Their Potential for Slip Rate and Paleoseismic Trenching Sites

https://doi.org/10.22146/ijg.93456

Gayatri Indah Marliyani(1*), Aulia Kurnia Hady(2), Yann Klinger(3), Agung Setianto(4), Hurien Helmi(5), Telly Kurniawan(6), Retno Agung Prasetyo Kambali(7), Zulham Sugito(8), Abdi Jihad(9), Yosi Setiawan(10), Andi Azhar Rusdin(11), Supriyanto Rohadi(12), Rahmat Triyono(13), Dwikorita Karnawati(14)

(1) Geological Engineering Departement, Universitas Gadjah Mada
(2) Department of Energy and Mineral Resources of NAD Province
(3) The Institut de Physique du Globe de Paris - Université de Paris Cité
(4) Geological Engineering Departement, Universitas Gadjah Mada
(5) Geological Engineering Department, Institut Teknologi Nasional Yogyakarta
(6) Meteorology, Climatology, and Geophysical Agency of Indonesia
(7) Meteorology, Climatology, and Geophysical Agency of Indonesia
(8) Meteorology, Climatology, and Geophysical Agency of Indonesia
(9) Meteorology, Climatology, and Geophysical Agency of Indonesia
(10) Meteorology, Climatology, and Geophysical Agency of Indonesia
(11) Meteorology, Climatology, and Geophysical Agency of Indonesia
(12) Meteorology, Climatology, and Geophysical Agency of Indonesia
(13) Meteorology, Climatology, and Geophysical Agency of Indonesia
(14) Meteorology, Climatology, and Geophysical Agency of Indonesia
(*) Corresponding Author

Abstract


We conducted a study on the Aceh Fault, an active right-lateral strike-slip fault in northern Sumatra, Indonesia. Despite its seismic hazard potential, the slip characteristics of this fault are not well-understood. Using a combination of remote sensing and field methods, we mapped the distribution of displacement recorded by offset channels along the fault. Our goal is to identify evidence of past surface rupture, characterize their tectonic geomorphology setting, and assess their potentials as slip-rate and paleoseismic sites. The documented right-lateral displacements of channels and ridges from 35 observation points are mostly in the order of magnitude of hundreds of meters, with only a few sites exhibiting meter-scale measurable offsets. Our results provide important first-order data that can be used to locate sites suitable for paleoseismic trenching or offset investigations. This information will support the development of a maximum magnitude and earthquake recurrence model of the fault, which are crucial for seismic hazard analysis in the region.

Keywords


Aceh Fault, offset channels, paleoseismology, Sumatran Fault

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References

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DOI: https://doi.org/10.22146/ijg.93456

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Copyright (c) 2024 Gayatri Indah Marliyani, Aulia Kurnia Hady, Yann Klinger, Agung Setianto, Hurien Helmi, Telly Kurniawan, Retno Agung Prasetyo Kambali, Zulham Sugito, Abdi Jihad, Yosi Setiawan, Andi Azhar Rusdin, Supriyanto Rohadi, Rahmat Triyono, Dwikorita Karnawati

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