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All Journal IJOG : Indonesian Journal on Geoscience Journal of Degraded and Mining Lands Management JGE (Jurnal Geofisika Eksplorasi) JOURNAL ONLINE OF PHYSICS Jurnal Fisika FLUX JITEK (Jurnal Ilmiah Teknosains) Spektra: Jurnal Fisika dan Aplikasinya Journal of Multidisciplinary Academic Eksakta : Berkala Ilmiah Bidang MIPA Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Geosfera: Jurnal Penelitian Geografi Jurnal Geosaintek
Yudha Styawan
Institut Teknologi Sumatera (ITERA)
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Veterinary

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Analysis of Fault Plane and Distribution of Coulomb Stress Changes of the Mw 7.8 Earthquake Southwest of Sumatra Gabriela Gabriela; Kelly Lasofia Br Girsang; Rizki Wulandari Wulandari; Yudha Styawan
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol27-iss03/701

Abstract

The Mw 7.8 earthquake that occurred southwest of Sumatra on March 2, 2016, at a depth of 24 km represents a major seismic event within the Sunda subduction zone, significantly influencing regional stress conditions. This study aims to analyze Coulomb stress changes (Δσc), examine stress distribution patterns, and evaluate the most representative fault plane controlling the earthquake source mechanism. The analysis was conducted using the Coulomb Stress Change method based on focal mechanism parameters and finite fault models obtained from the United States Geological Survey (USGS). The results indicate that Nodal Plane 1 (NP1) represents the true fault plane controlling the earthquake mechanism, with maximum stress increase of up to  0.1 bar and orientations from west–east to northwest–southeast. In contrast, Nodal Plane 2 (NP2) acts as a receiver fault, accommodating transferred stress from the main rupture, with similar stress magnitudes oriented north–south to west–east. The observed stress increases on both nodal planes highlight potential zones for aftershock occurrence. This study contributes to a better understanding of earthquake source mechanisms and stress redistribution patterns that may trigger subsequent seismic activity in the southwest  region of Sumatra..
Coulomb Stress Change of the 2006 Pangandaran Earthquake (Mw 7.7) and Its Implication for Future Seismicity in the Sunda Subduction Zone Hana Situmorang; Kayla Alexandra; Yudha Styawan; Rizki Wulandari
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 23, No 2 (2026): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v23i2.26282

Abstract

The Pangandaran earthquake on July 17, 2006, with a magnitude of Mw 7.7, was a tsunami earthquake that triggered a massive tsunami along the southern coast of Java, causing extensive damage and claiming many lives. This study aims to analyze the distribution of Coulomb stress change (ΔCFF) resulting from the 2006 Pangandaran earthquake based on Nodal Plane 1 (NP1), Nodal Plane 2 (NP2), and a finite fault model as validation references. ΔCFF modeling was performed using a rectangular fault plane approach, with interpolation conducted at depths ranging from 0 to 40 km in 10-km intervals to identify the depth yielding the most representative stress distribution. Analysis results indicate that NP1 with strike 284°, dip 9°, and rake 87° at a depth of 10 km produces a ΔCFF distribution pattern most consistent with and representative of the aftershock distribution and closest to the finite fault model pattern. The stress loading zone (ΔCFF > 0) extends northward from the epicenter toward the southern coast of Java, indicating an increased potential for aftershocks in that segment. Meanwhile, the stress-shadow zone (ΔCFF < 0) in the central to western regions reflects the location of the main slip release. The shallow geometry of the NP1 fault plane (dip 9°) contributes to the extensive stress loading zone, reflecting the characteristics of the Sunda subduction megathrust interface. The results of this study indicate that the 2006 Pangandaran earthquake significantly transferred stress to the western and eastern segments of the subduction zone, implying a potential hazard of subsequent seismic activity in the southern Java region.
Analisis Bahaya Gempa Bumi Berdasarkan Nilai Peak Ground Acceleration (PGA) Menggunakan Metode Probabilistic Seismic Hazard Analysis (PSHA) di Wilayah Bali dan Nusa Tenggara Muhammad Hafeezul; Yudha Styawan; Rizki Wulandari
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1621

Abstract

The Bali, West Nusa Tenggara (NTB), and East Nusa Tenggara (NTT) regions are located within an active tectonic zone influenced by the transition subduction of the Sunda–Banda arc and the presence of surrounding active faults, resulting in a high potential for earthquake hazards. This study was conducted to evaluate seismic hazard through the estimation of Peak Ground Acceleration (PGA) using the Probabilistic Seismic Hazard Analysis (PSHA) method. The analysis is based on an earthquake catalog covering the period 1964–2024 and considers various seismic sources, including shallow background, deep background, active faults, and megathrust sources. Earthquake occurrence models for fault and subduction sources were represented using a truncated exponential model. Ground motion predictions were calculated using several Ground Motion Prediction Equations (GMPEs), which were combined through a logic tree approach. The calculations were performed at bedrock conditions with a Vₛ30 value of 760 m/s, for exceedance probabilities of 10% and 2% within a 50-year period. The results indicate that PGA values for a 10% probability of exceedance range from 0.30 to 1.18 g, while those for a 2% probability of exceedance range from 0.62 to 1.75 g. High PGA values are distributed in the southern and eastern regions, which are adjacent to megathrust segments and active faults with high slip rates, whereas the northern regions exhibit lower PGA values. These results are important for public awareness in earthquake disaster mitigation efforts and for earthquake-resistant building planning.
Enhancing Seismic Hazard Preparation in Lampung, Sumatra: Improved Magnitude Conversion, Seismicity Smoothing, and Area Source Modeling Rizki Wulandari; Yudha Styawan; Chung-Han Chan
Indonesian Journal on Geoscience Vol. 13 No. 2 (2026)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.13.2.221-241

Abstract

This work improves seismic hazard evaluation for the Lampung region in Sumatra by tackling the precision in magnitude conversion, attenuation of seismicity, and area-source modelling. Considering the variety magnitude. The magnitude conversion equations were initially validated using scales from historical earthquake data. And, if required, enhanced to guarantee their dependability for the area. Utilizing maximum likelihood estimation Maximum Likelihood Estimation (MLE) and ordinary. Ordinary least squares (OLS) regression was employed to compute parameters for frequency-magnitude distributions. Facilitating a comprehensive comparison that acknowledges OLS's sporadically superior alignment with observed data. Gaussian distribution smoothing was utilized diverse bandwidths (25, 50, 75, and 100 km) to illustrate spatial seismicity patterns, disclosing a distance of 50 kilometers. Bandwidth provides the most consistent model performance, especially in terms of accuracy in the Molchan illustration. The area skill score (ASS) validates the superior forecasting capacity of the smoothed seismicity models. Using bandwidths of 25, 50, and 75 kilometers producing competitive outcomes. Furthermore, the region was partitioned into discrete seismic zones predicated on fault characteristics and seismicity density, further augmenting localized hazard assessments. This is polished. multi-method approach encompassing magnitude conversion, spatial smoothing, and area-specific analysis. Modelling offers a comprehensive framework for seismic hazard preparedness in Lampung, providing useful insights for infrastructure strategic planning and disaster mitigation.
Co-Authors Agus Ariyanto Antosia, Risky Martin Ardian Saputra Chung-Han Chan Efriyanti, Annisa Eka Nioisa Br Surbakti Endryanti, Windy Meylana Farduwin, Alhada Fattah, Erlangga Ibrahim Gabriela Gabriela Hana Situmorang Junian, Wahyu Eko Kayla Alexandra Kelly Lasofia Br Girsang Laila Auliya Lestari, Eka Yunita Purnama Maisyaroh, Siti Muhammad Hafeezul Nugraha, Purwaditya Nugraha Nugroho Prasetyo Nurwijayanti Pinem, Junita Cintia Dewi Br Prasetyo, Nugroho Purwaditya Nugraha Putri, Intan Andriani Reza Rizki Reza Rizki Riski Wahyudi Rizki Wulandari Rizki Wulandari Wulandari Rizki, Reza Satria Bagus Prabowo Sillak Hasiany Tata Dwi Hardi Yanti TR, Dina Puspita Julyanti Zakhra, Vera Meysya