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All Journal Indonesian Journal of Geography Jurnal Penelitian Fisika dan Aplikasinya (JPFA)
Kurniawan, Telly
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Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics

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ANALYSIS OF STRESS DROP VARIATIONS IN FAULT AND SUBDUCTION ZONES OF MALUKU AND HALMAHERA EARTHQUAKES IN 2019 Yuliatmoko, Rahmat Setyo; Kurniawan, Telly
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 9, No 2 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n2.p152-162

Abstract

The amount of stress released by an earthquake can be calculated with a stress drop, the stress ratio before and after an earthquake where the stress accumulated in a fault or a subduction zone is immediately released during an earthquake. The purpose of this research is to calculate the amount of stress drop in faults and subduction in Maluku and Halmahera and their variations and relate them to the geological conditions in the area so that the tectonic characteristics in the area can be identified. This research employed mathematical analysis and the Nelder Mead Simplex nonlinear inversion methods. The results show that Maluku and Halmahera are the area with complex tectonic conditions and large earthquake impacts. The Maluku sea earthquake generated a stress drop of 0.81 MPa with a reverse fault mechanism in the zone of subduction, while for the Halmahera earthquake the stress drop value was 52.72 MPa, a typical strike-slip mechanism in the fault zone. It can be concluded that there is a difference in the stress drop between the subduction and fault zones; the stress drop in the fault was greater than that in the subduction zone due to different rock structure and faulting mechanisms as well as differences in the move slip rate that plays a role in the process of holding out the stress on a rock. This information is very important to know the amount of pressure released from the earthquake which has a very large impact as part of disaster mitigation measures.
Exploring Aceh Fault Zone for Slip Rates and Paleoseismic Trenching Potential along Sumatran Fault Marliyani, Gayatri Indah; Hady, Aulia Kurnia; Klinger, Yann; Setianto, Agung; Helmi, Hurien; Kurniawan, Telly; Kambali, Retno Agung Prasetyo; Sugito, Zulham; Jihad, Abdi; Setiawan, Yosi; Rusdin, Andi Azhar; Rohadi, Supriyanto; Triyono, Rahmat; Karnawati, Dwikorita
Indonesian Journal of Geography Vol 56, No 1 (2024): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.93456

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.
Co-Authors Agung Setianto Dwikorita Karnawati Gayatri Indah Marliyani Hady, Aulia Kurnia Helmi, Hurien Jihad, Abdi Kambali, Retno Agung Prasetyo Klinger, Yann Rusdin, Andi Azhar Setiawan, Yosi Sugito, Zulham Supriyanto Rohadi, Supriyanto Triyono, Rahmat Yuliatmoko, Rahmat Setyo