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All Journal Fullerene Journal of Chemistry Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal)
Sarinah Pakpahan
Universitas Negeri Gorontalo
Agriculture, Biological Sciences & Forestry Chemistry Education Physics

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Analisis Spasial Respon Situs Berdasarkan Vs30 USGS, Estimasi Amplifikasi dan Periode Dominan di Seram Bagian Timur Rimawanto Gultom; Sarinah Pakpahan; Nasya Syahnur Pattimura; Ratih C F Ratumanan; Sri Indriati
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 2 (2026): May
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i2.1793

Abstract

This study focuses on Seram Bagian Timur, an area known for its complex geological setting and active tectonic. Recent seismic events, including the 26 September 2019 Ambon earthquake (Mw 6.5) and the 22 June 2025 earthquake near Bula (Mw 5.0), indicate the presence of active fault systems and heterogeneous subsurface conditions. These conditions govern how seismic waves are modified at the ground surface particularly variation in subsurface material properties. This effect is represented by the amplification factor, which estimated using the empirical relationship proposed by Fujimoto and Midorikawa. The objective of this study is to examine the spatial variability of site response using Vs30 data from USGS, along with amplification factors and dominant periods. The analysis is based on 6,550 grid points with a spatial resolution of approximately 930 m, supported by regional geological information. Data processing involved extraction, interpolation, and mapping, while amplification and dominant period were estimated using empirical approach The results indicate that Vs30 values range from 180 to 900 m/s (site classes BC–E), with lower values concentrated in coastal and eastern areas, and higher values predominantly found in the western part of the study area. Amplification factors vary between 0.77 and 2.79, generally falling within low to moderate categories. Meanwhile, dominant periods range from 0.133 to 0.667 seconds, representing soil types from hard to very soft conditions. Overall, the three parameters show a consistent pattern, where lower Vs30 values tend to correspond to higher amplification and longer dominant periods, reflecting less consolidated subsurface materials.
Effect of Binder Concentration on Density and Combustion Performance of Sawdust Biopellets Siti Fauziah; Sarinah Pakpahan; Aswin Aswin; Vivi Dia Afrianti S
Jurnal Kimia Fullerene Vol 11 No 2: Fullerene Journal Of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v11i2.792

Abstract

Sawdust is an abundant by-product of the wood processing industry and has significant potential as a raw material for biopellet production. However, the quality and combustion performance of biopellets are strongly influenced by the binder concentration used during the production process. This study investigates the effect of binder concentration on the density and combustion performance of sawdust-based biopellets. Biopellets were prepared with binder concentrations of 35%, 40%, and 45% and evaluated through density measurement, bomb calorimeter testing, and combustion analysis. The results show that increasing binder concentration enhances density from 1.16 to 1.26 g/cm³, indicating improved structural compactness. However, the higher heating value (HHV) decreases from 14.44 ± 0.13 MJ/kg to 12.23 ± 0.13 MJ/kg due to dilution of energy-rich biomass. Combustion analysis reveals increased ignition time and longer burning duration at higher binder content, indicating more stable but less reactive combustion. These findings demonstrate a trade-off between mechanical strength and energy performance. Therefore, a binder concentration of 35% is recommended for energy-efficient applications, while higher concentrations may be suitable for durability-oriented uses.
Co-Authors Aswin Aswin Nasya Syahnur Pattimura Ratih C F Ratumanan Rimawanto Gultom Siti Fauziah Sri Indriati Vivi Dia Afrianti S