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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences POSITRON Jurnal Penelitian Fisika dan Aplikasinya (JPFA) JURNAL FISIKA IJOG : Indonesian Journal on Geoscience Journal of Information Technology and Computer Science Jurnal Penelitian Pendidikan IPA (JPPIPA) Journal of Physics and Its Applications Journal of Engineering, Technology, and Applied Science (JETAS) Sriwijaya Bioscientia Scientific Contributions Oil and Gas
Rosid, Mohammad Syamsu
Department Of Physics, Faculty Of Mathematics And Natural Sciences, Universitas Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Physics

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HVSR Microtremor Resonance Frequency and Amplification Analysis Using Earthquake Data for Seismic Hazard Mitigation in Lombok Island Edy Santoso; Mohammad Syamsu Rosid; Sigit Pramono; Frilla Renty Tama Saputra; Daryono Daryono; Setyoajie Prayoedhie
Journal of Physics and Its Applications Vol 8, No 2 (2026): May 2026
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v8i2.30787

Abstract

Lombok Island exhibits high seismicity driven by the complex interaction between the subduction of the Indo-Australian plate beneath the Eurasian plate and the activity of the Flores Back-arc Thrust. In seismic hazard mitigation, the Horizontal-to-Vertical Spectral Ratio (HVSR) technique is a fundamental tool for estimating site effects. However, the validity of parameters derived from ambient noise (MHVSR) versus earthquake records (EHVSR) remains a subject of geophysical debate, particularly in regions with high structural heterogeneity. This research evaluates the reliability of resonance frequency (f0) and amplification factor (A0) by conducting a direct comparison between MHVSR and EHVSR datasets. Seismic data from seven BMKG stations across Lombok were meticulously selected and processed. The analysis involved windowing and the application of Fast Fourier Transform (FFT) to transition raw waveforms into the frequency domain, allowing for the extraction of stable HVSR spectral curves. The findings reveal a robust correlation between microtremor and earthquake-derived HVSR, with on f0 (r = 0.9954, σ = 0.301) and A0 (r = 0.9232, σ = 0.75). Observed minor discrepancies are likely the result of local lithological conditions, wave attenuation, and source-dependent variations such as magnitude or hypocentral distance. Ultimately, this study confirms that ambient vibration HVSR provides dependable estimates of site resonance parameters, aligning with earthquake records within tolerable error margins. These results strengthen the case for microtremor investigations as a reliable, non-invasive method for local seismic hazard evaluation. Such findings are vital for refining seismic hazard mitigation and enhancing urban resilience planning in seismically active zones like Lombok island.
Developing 1-D velocity model along Matano Fault Zone, Sulawesi, Indonesia Madona Madona; Mohammad Syamsu Rosid; Djati Handoko; Dimas Salomo Januarianto Sianipar
Journal of Physics and Its Applications Vol 8, No 1 (2026): February 2026
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v8i1.29859

Abstract

The Matano Fault, with a slip rate of ~ 20 mm/year, is the most active strike-slip fault in Sulawesi after the Palu-Koro Fault. As a result, this region exhibits a high level of seismicity. Unfortunately, a number of studies that have been conducted only involve a less dense network of stations and global velocity models. This study aims to obtain an optimum velocity model using the VELEST program, which reliably represents the actual condition of the study area. The data used in this study consists of hypocenter, origin times, and P-wave arrival times from earthquakes (Mw ≥ 3), each containing at least six clearly identified P-wave phases. These data were obtained from 317 events that occurred within the region bounded by 120.10°E – 122.20°E and 2.99°S – 1.66°S during the period from January 2022 to March 2025. To determine the optimum 1-D velocity model, four initial models were tested, namely Koulakov, Arimuko, Crust, and Bunaga. These models were evaluated based on RMS, the stability test of the updated velocity model, uncertainty assessment using bootstrap test, and their consistency with previous studies. The evaluation results indicate that the Arimuko Model is the most reliable, as it provides the lowest RMS value, stable hypocenter relocations (±6–7 km), bootstrap results showing narrow uncertainty intervals, and consistency with earlier studies that identified a low-velocity zone at depths of 0–3 km. The result of this study is expected to serve as a reference for earthquake relocation and seismicity analysis at the Matano Fault Zone.
Co-Authors Ade Andika Saputra Agung, Lendriadi Aina Najwa Darmanto Ardhianto Septiadhi Auriwan Yasper Daryono Daryono Dimas Salomo Januarianto Sianipar Djati Handoko Dzikrullah Akbar Edy Santoso Edy Wijanarko Edy Wijanarko Febriani, Febty Frilla Renty Tama Saputra Frilla Renty Tama Saputra Gathot Winarso Gathot Winarso, Gathot Handoko, Djati Harry Kasuma Aliwarga Hartagung, Riky Tri I Gusti Ketut Satria Bunaga I Putu Arix Putra Wiguna Jatna Supriatna Kuncoro Teguh Setiawan, Kuncoro Teguh Lolla Riandari, Baiq Madona Madona MASITA DWI MANDINI MANESSA, MASITA DWI MANDINI Maulana Putra Miftahul Farhati Muhammad Kamal Ni Putu Juliyant Ananda Rika Pangastuti Novi Susetyo Adi, Novi Susetyo Prawito Prajitno Putra, Maulana Rose Firdiany Nur Sukma S, Novita Sari Setyoajie Prayoedhie Sigit Pramono Suardana, A.A. Md. Ananda Putra Sugiarto Supardjo, Harsono Supriyanto Rohadi Syaefudin, Mohamad Anwar Takahiro Osawa Titi Anggono Titi Anggono Titi Anggono Tofan Sastranegara, Mochamad Urip Setiyono Wikanti Asriningrum Wikanti Asriningrum, Wikanti Winata, Eresia Nindia Wulandari, Yulia Putri