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All Journal Indonesian Physical Review Progressive Physics Journal
Syahruni, Risda
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Astronomy Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Health Professions Materials Science & Nanotechnology Physics

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Analisis Indeks Resonansi dan Kerentanan Jembatan Rel Kereta Api Maros-Barru Berdasarkan Data Mikrotremor (Studi Kasus Jembatan WTT Maccini Baji) Syahruni, Risda; Sulistiawaty, Sulistiawaty; Palloan, Pariabti; Kaharuddin, Kaharuddin
Progressive Physics Journal Vol. 5 No. 2 (2024): Progressive Physics Journal
Publisher : Program Studi Fisika, Jurusan Fisika, FMIPA, Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ppj.v5i2.1372

Abstract

This research is a quantitative descriptive research that aims to analyze the value of natural frequency and amplification factor, as well as knowing the level of resonance and vulnerability of WTT Maccini Baji Railway Bridge. This research was conducted on the Maros-Barru Railway Line, especially the WTT Maccini Baji Railway Bridge, Lau District, Maros Regency, South Sulawesi Province. Data collection was carried out at 8 points (4 points on the bridge and 4 points on the ground around the bridge) with two measurement times at each point, day and night. Processing of microtremor data using Geopsy software with the HVSR (Horizontal to Vertical Spectral Ratio) method to obtain HVSR curves that produce natural frequency and amplification values. The results showed natural frequency values ranging from 2,36 – 6,64 Hz and amplification values ranging from 2,67 – 15,92. The resonance index value of the Maccini Baji WTT Bridge obtained ranges from 30,68% – 181,49% and is included in the low resonance classification which indicates the bridge has a solid structure and is safe from potential damage due to resonance. While the seismic vulnerability index is obtained with a value of 2,07 – 77,35 which shows that the high seismic vulnerability classification is more dominant at the point located on the ground.
MAGNETIC CHARACTERISTICS AND MINERAL COMPOSITION ANALYSIS OF KARST ROCKS FROM RAMMANG-RAMMANG KARST AREA, MAROS REGENCY, SOUTH SULAWESI, INDONESIA Syahruni, Risda; Susanto, Agus; Arsyad, Muhammad; Subaer, Subaer; Husain, Husain
Indonesian Physical Review Vol. 9 No. 1 (2026)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v9i1.575

Abstract

This study investigates the magnetic characteristics and mineral composition of rocks in the Rammang-Rammang Karst area, Maros Regency, South Sulawesi, Indonesia, to clarify lithological variability and its implications for local magnetic anomalies. A total of 25 rock samples collected from field sampling points were analysed using a Bartington Susceptibility Meter, while five samples were further examined with a Vibrating Sample Magnetometer (VSM), X-Ray Fluorescence (XRF), and X-Ray Diffraction (XRD). The magnetic susceptibility values range from –0.6 to 10.5 m³/kg, indicating a predominance of diamagnetic behaviour with minor contributions from paramagnetic and antiferromagnetic minerals. Hysteresis curve analysis from VSM confirmed the consistency between magnetic responses and susceptibility measurements. XRF results show that Ca dominates the rocks (>95%), with minor amounts of Fe, Ti, Si, Mn, Cu, Sr, Mo, In, and Co, as well as trace amounts of rare-earth elements (Lu, Eu). XRD analysis confirmed calcite (CaCO₃) as the principal mineral phase, with crystallite sizes ranging from 39 to 44 nm, and the presence of dolomite in sample T18. The spatial distribution of magnetic susceptibility indicates that most of the study area exhibits low and negative values, reflecting diamagnetic behaviour. Whereas the highest value occurs at sampling point T12, which localizes the highest-susceptibility area, marked in red. These results indicate that the magnetic variability of Rammang-Rammang rocks is controlled by minor accessory magnetic minerals, providing valuable insights for mineral exploration and mitigating local magnetic anomalies.  
Co-Authors Agus Susanto Husain Husain Kaharuddin Muhammad Arsyad Pariabti Palloan Subaer - Sulistiawaty Sulistiawaty, Sulistiawaty