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All Journal Jurnal Geosains dan Teknologi Jambura Geoscience Review
Valennita, Valennita
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Earth & Planetary Sciences Energy Engineering Environmental Science

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Estimate Sediment Thickness in Air Sempiang Village, Kepahiang Using the HVSR Method and the f0 and A0 Values Hafiza, Belliya; S, Vionita; Rabbani, Muhammad Rifqi; Suhendra, Suhendra; Sihombing, Yezra Tariza; Valennita, Valennita; Febriansyah, Gian Ori
Jambura Geoscience Review Vol 8, No 1 (2026): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v8i1.31789

Abstract

Microtremor-based site characterization provides rapid constraints on near-surface stratigraphy where borehole or geotechnical data are limited. This study estimates relative sediment-thickness variation and site response in Air Sempiang Village (Kabawetan District, Kepahiang Regency, Bengkulu Province, Indonesia) using the horizontal-to-vertical spectral ratio (HVSR) method and the derived dominant frequency (f₀) and amplification factor (A₀). Ambient-vibration data were acquired at 13 measurement points (30 min per site) using a PASIGemini-2 three-component geophone. HVSR processing was performed in Geopsy 3.2.2, including time-window selection, spectral smoothing, and peak identification to obtain f₀ and A₀. The resulting parameters were interpolated using inverse distance weighting in ArcGIS to generate spatial distribution maps. The estimated dominant frequencies are predominantly high (approximately 7–20 Hz), indicating generally shallow sediment cover and relatively stiff near-surface conditions, with localized lower-f₀ zones interpreted as thicker sediment accumulations. Amplification factors vary from 2 to 8, with moderate-to-high amplification concentrated in areas inferred to contain softer or thicker sediments, whereas lower A₀ values coincide with zones interpreted as being closer to competent bedrock. The combined f₀–A₀ patterns delineate subareas that are more susceptible to medium- to high-frequency ground-motion amplification and provide a first-order basis for local-scale seismic microzonation and earthquake risk mitigation planning in the study area.
Karakterisasi Sistem Akuifer Berdasarkan Metode Geolistrik VES di Kecamatan Tanjung Sakti, Kabupaten Lahat Wijaya, Agung; Prabowo, Benny Bayu; Harlianto, Budi; Valennita, Valennita; Setiawati, Lulu Indah; Saputra, Marven
Jurnal Geosains dan Teknologi Vol 9, No 1 (2026)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.9.1.2026.104-114

Abstract

Kecamatan Tanjung Sakti, Kabupaten Lahat, merupakan wilayah pertanian dan perkebunan yang terus berkembang, namun menghadapi tantangan ketersediaan air tanah akibat peningkatan kebutuhan domestik dan irigasi. Penelitian ini bertujuan untuk mengidentifikasi zona potensial akuifer menggunakan metode geolistrik tahanan jenis (Vertical Electrical Sounding/VES) konfigurasi Schlumberger yang dikombinasikan dengan pemodelan 2D berbasis Python. Lokasi pengukuran tersebar pada enam titik strategis, dengan penetrasi kedalaman hingga ±120 meter. Data resistivitas dianalisis secara vertikal (1D) menggunakan software Progress, kemudian disusun menjadi model penampang 2D menggunakan interpolasi cubic spline. Daerah penelitian tersusun oleh Formasi Breksi Gunung Api (Qhv) dan Lava Andesit-Basalt (Qv), yang secara hidrogeologi termasuk dalam Cekungan Air Tanah (CAT) Muaradua–Curup. Hasil interpretasi menunjukkan keberadaan akuifer bebas pada kedalaman dangkal dan akuifer tertekan di bawah lapisan impermeabel, dengan zona potensial tertinggi berada pada titik T4 dan T6. Penelitian ini memberikan gambaran spasial sistem akuifer bawah permukaan dan menjadi dasar ilmiah untuk perencanaan sumur bor, pengelolaan airtanah, serta konservasi sumber daya air secara berkelanjutan.
Co-Authors Agung Wijaya, Agung Febriansyah, Gian Ori Hafiza, Belliya Harlianto, Budi Prabowo, Benny Bayu Rabbani, Muhammad Rifqi S, Vionita Saputra, Marven Setiawati, Lulu Indah Sihombing, Yezra Tariza Suhendra Suhendra