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All Journal Teknosains: Media Informasi Sains dan Teknologi Jurnal Fisika Unand JITEK (Jurnal Ilmiah Teknosains) JPSE (Journal of Physical Science and Engineering) Jurnal Geocelebes Jurnal Penelitian Pendidikan IPA (JPPIPA) Neutrino Indonesian Physical Review Jurnal Fisika dan Terapannya Community Development Journal: Jurnal Pengabdian Masyarakat Jurnal Ilmiah Wahana Pendidikan KUANTUM: Jurnal Pembelajaran dan Sains Fisika Patria Artha Journal of Community Journal Of Khairun Community Services Journal of Science and Science Education (JoSSEd) Jurnal Edu Research Jurnal Pijar MIPA Newton-Maxwell Journal of Physics Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Geosains Kutai Basin Jurnal Pengabdian Rekayasa Sistem KUANTUM Faraday: Journal of Fundamental Physics, Research, and Applied Science Jurnal Pengabdian Indonesia BULETIN FISIKA Jurnal Pengabdian Masyarakat Indonesia
Meidji, Icha Untari
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Seismic Hazard Assessment in Gorontalo: Subduction Zone and Earthquake Analysis Icha Untari Meidji; Dewa Gede Eka Setiawan; Irsan; Kartika; Harsano Jayadi
Jurnal Penelitian Pendidikan IPA Vol 11 No 10 (2025): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i10.12956

Abstract

The Gorontalo region is one of the regions on the island of Sulawesi that is quite significant in terms of tectonic activity due to earthquakes. This is because Gorontalo is located in a tectonic environment, with a subduction zone in the Sulawesi Trench north and the Balantak Thrust and Batui Thrust south of the Gorontalo Fault. To further understand Gorontalo's seismic activity, we conducted a seismotectonic analysis in the form of identifying the number of earthquakes from 1994 to 2025, interpreting the results of the focal mechanism distribution by classifying them in the Kaverina diagram, and analyzing the results of earthquake hypocentre relocation from 2015 to 2022. The study results show that 2.317 earthquake events over 30 years spread across all areas of Gorontalo, categorised as shallow, medium, and deep earthquakes. The Gorontalo area is dominated by reverse faulting focus mechanisms, which are commonly found at shallow to intermediate depths. This is interpreted as being due to the presence of a subduction zone. A different situation occurs at deep depths, where the focal mechanism is normal faulting, indicating the presence of extensional forces due to the rollback slab process. The distribution of earthquake mechanisms also shows that a combination of strike-slip and reverse mechanisms occurs around active fault zones. In contrast, strike-slip mechanisms with standard mechanisms are more dominant in extensional zones.
Analysis of the Hydrodynamic Characteristics of Limboto Lake Waters Based on Momentum Fluxes Khan, Mikail Gabriel Khan; Yunginger, Raghel Yunginger; Setiawan, Dewa Gede Eka; Jahja, Mohamad; Meidji, Icha Untari; Ahmadi, Haerul; Kusmayancu, Cucu; Nalle, Merpati Teodoris
BULETIN FISIKA Vol. 27 No. 1 (2026): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2026.v27.i01.p02

Abstract

The waters of Lake Limboto show a decline in water quality, characterized by a decrease in clarity. Environmental factors, such as wind speed and direction, play a significant role in influencing the dynamics and quality of lake waters. To understand the influence of wind on water conditions, a comprehensive hydrodynamic study is required. This study focuses on analyzing the hydrodynamic characteristics of Lake Limboto waters based on momentum flux and its implications for lake water conditions. Wind speed and direction measurements were conducted on seven ducks in Lake Limboto waters during the period of November 1-3, 2024. Data were collected in the morning, afternoon, and evening. The lake's hydrodynamic characteristics were determined using formulas from the measured data. Hydrodynamic characteristics were interpolated using IDW cross validation leave one out and optimized with rank and neighboring point parameters. Wind direction was interpolated using IDW and converted into a vector field using Vector Field Layer Manager. It was found that the momentum flux by wind in Lake Limboto waters has a value range of 0-0.05 N/m2, and cross validation produced an RMSE of 0.003-0.01 N/m2. The interaction of momentum flux from wind and river flow causes sediment to be deposited in the coastal area of ​​Lake Limboto.
Earthquake Analysis Using the Probabilistic Seismic Hazard Analysis (PSHA) Method in Palu City Harsano Jayadi; Icha Untari Meidji; Irna Hidayat; Abdullah
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 2 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i2.18

Abstract

Palu, Indonesia, is a region with high seismic activity due to its location on the active Palu-Koro fault line. This study aims to analyze the probability of earthquakes, the spatial and temporal distribution of earthquake occurrences, and disaster mitigation efforts in anticipation of earthquakes in the region. Earthquake data in Palu City were analyzed based on magnitude, depth, and frequency of occurrence. The results indicate that most earthquakes occur at shallow depths ranging from approximately 10 to 56.8 kilometers, with a dominance of moderate magnitude (5.0–5.7 M_w). Over the past two decades, there has been an increase in the temporal occurrence of earthquakes, with a significant surge in 2018 when a magnitude 7.5 earthquake triggered a tsunami and liquefaction. Probability analysis indicates that earthquakes with high seismicity indices are highly likely to occur within a 10- to 50-year timeframe. The spatial distribution reveals that earthquakes tend to be concentrated around the Palu-Koro fault, the primary source of seismic activity in the region. These findings provide important insights into the seismic patterns of Palu City and can inform community preparedness and disaster mitigation strategy development.
Seismicity Analysis of Earthquake in Bengkulu Using Gutenberg-Richter and Omori laws Fiska Tobamba; Icha Untari Meidji; Harsano Jayadi
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 2 No. 1 (2026): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v2i1.46

Abstract

Bengkulu Province is one of the regions in Indonesia with high seismic aktivity because it lies within the Sumatra tectonic plate zone and is crossed by the Sumatra Fault system. This tectonic setting makes Bengkulu highly vulnerable to Earthquake. This study analyzes the seismic characteristics of Bengkulu Using the Gutenberg-Richter law and examines the aftershock pattern following the major earthquake of june 4, 2000, based on the Omori-Utsu law. The data were obtained from the USGS earthquake catalog, consisting of earthquake records from 2015-2025 and afthershock data for 30 days after the mainshock. The Gutenberg-Richter Analysis evaluates the relationship between log10N and moment magnitude (Mw) to determine the a and b values. Meanwhile, Omori-Utsu Analysis examines the relationship between log10 n(t) and log10 (t+c) to obtain the parameters p and k. The result show that Bengkulu's seismicity is dominated by small to moderate earthquakes with relatively low b-values, indicating high tectonic stress conditions. The aftershock Analysis produced a p-value of 1.4822 with an R² value of 0.7767, showing rapid aftershock decay consistent with the Omori-Utsu law. These findings confirm Bengkulu has a high seismic Hazard level, emphasizing the need for continuous mitigation and preparedness efforts.
Co-Authors Abd Wahidin Nuayi Abdul Mukaddas Abdul Mukaddas Abdullah Ahmad Zainuri Ahmadi, Haerul Akuba, Kisman Akuba, Kisman R Andi Indra Wulan Sari Ramadani Aris, Ayub Pratama Asri Arbie Ayusari Wahyuni Ayusari Wahyuni Basyri Yadi Tang Bergita Gela M Saka Botjing, Muslimin U Dewa Gede Eka Setiawan Dwa Desa Warnana Firman Firman Fiska Tobamba Gafur, Nurfitri Abdul Harsano Jayadi Harsano Jayadi Hasan Arif Efendi Huzaima Mas’ud I Made Hermanto Idris, Rani Ika Daruwati, Ika Imran, Syahdan Ali Indriati Martha Patuti Irianto Uno Irna Hidayat Irsan Irsan Rahman Irsan Rahman, Irsan Jahja, Mohamad Jahja, Mohamada Jajat Jatnika Kartika Khan, Mikail Gabriel Khan Kurniasari, Septiana Kusmayancu, Cucu Lapananda, Nuraliva F.P Latief, Muh. Fachrul Lukman Samatowa Mamonto, Yusril Mahendra Masruroh Masruroh Meilan Demulawa Moch Rio Pambudi Moh Dahlan Th Musa Mohamad Ramdhan Mohamad, Wahyu Mu’zizat Muh. Abduh Muh. Fachrul Latief Muhammad Fawzy Ismullah Massinai Muhammad Yunus Muhammad Yunus Mursalin . Nalle, Merpati Teodoris Ninasafitri, Ninasafitri Nurhayati Paputungan, Devi Triana Rachman, Gazali Rifai, Rusni R Sismanto Sismanto Supu, Idawati Tang, Basyri Yadi Tang, Bunga Widi Atmoko Widi Atmoko Widi Atmoko Windi Lestari Yudoyono, Susilo Yunginger, Raghel Yunginger Yusniati H. Muh. Yusuf Yutdam Mudin