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All Journal Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal)
Efmadani
Universitas Bengkulu
Agriculture, Biological Sciences & Forestry Chemistry Education Physics

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Identifikasi Sebaran Peak Ground Acceleration (PGA) Menggunakan Data Mikrotremor di Sekitar Danau Ranau Kabupaten Lampung Barat Gede Oktiana; Arif Ismul Hadi; Muchammad Farid; Efmadani; Gita Panny Nababan; Sefti Dewi Sari; Yola Dwi Ramadhani
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.v7i2.1755

Abstract

West Lampung Regency is located within an active tectonic zone associated with the Sumatra Fault system and is therefore vulnerable to significant earthquake ground shaking. This study aims to identify the spatial distribution of Peak Ground Acceleration (PGA) based on local site characteristics derived from microtremor measurements. Microtremor data were recorded at distributed observation points and analyzed using the HVSR method to determine the dominant frequency (f₀) and amplification factor (A₀) of the soil. The results indicate that f₀ values range from 0.544 to 15.1 Hz, while A₀ values vary between 1.66 and 8.57, reflecting heterogeneous subsurface conditions. These parameters were used to estimate PGA, which ranges from 0.105 to 0.565 g across the study area. Higher PGA values are generally associated with areas characterized by lower dominant frequencies and higher amplification, indicating thicker or softer sediment layers. The resulting PGA distribution map reveals zones with relatively higher seismic response potential. These findings demonstrate the importance of site-specific dynamic characterization in seismic hazard assessment and provide essential information for earthquake risk mitigation and regional development planning in West Lampung Regency.
Identifikasi Potensi Akuifer Menggunakan Metode Geolistrik Resistivitas Konfigurasi Wenner di Kelurahan Betungan, Kota Bengkulu Felysia Laurend; Suhendra; Efmadani
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 3 (2026): August (Inpres)
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i3.2082

Abstract

Groundwater is an important water resource for meeting community water demands. Information regarding subsurface characteristics and aquifer occurrence is essential for assessing groundwater potential in a given area. This study aims to identify subsurface layer characteristics and determine zones with potential as aquifers in Raflesia Asri Housing Estate, Betungan Village, Selebar District, Bengkulu City. The research employed the two-dimensional (2D) electrical resistivity method using the Wenner configuration. The measured data were processed using Res2DINV software to obtain a subsurface resistivity distribution model. The inversion results indicate resistivity values ranging from 1.52 Ωm to 317 Ωm, with an investigation depth of approximately 43 m. Low-resistivity zones (1.52–15.0 Ωm) are interpreted as clay and silt layers, whereas moderate-resistivity zones (15.0–69.0 Ωm) are interpreted as clayey sand to water-saturated sand, which are considered potential aquifer layers. High-resistivity zones (>69.0–317 Ωm) are interpreted as gravelly sand and weathered rock. The dominance of moderate-resistivity zones in the inverted resistivity sections indicates the presence of potential aquifers that may serve as groundwater resources in the study area.
Co-Authors Arif Ismul Hadi Farid, Muchammad Felysia Laurend Gede Oktiana Gita Panny Nababan Sefti Dewi Sari Suhendra Yola Dwi Ramadhani