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All Journal TERRA : Journal of Land Restoration JURNAL TEKNOLOGI MINERAL FT UNMUL
Aldio Kresna Pambayu
Universitas Pembangunan Nasional "Veteran" Yogyakarta
Agriculture, Biological Sciences & Forestry Control & Systems Engineering Energy Engineering Mechanical Engineering

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Outcrop-Scale Investigation of Geological and Soil Physical Controls on Slope Stability in the Semilir Formation Vinni Lovita; Dzikru Aminulloh; Djoko Mulyanto; Devanda Ayu Lidya Permata Putri; Aldio Kresna Pambayu
TERRA : Journal of Land Restoration Vol. 8 No. 2 (2025)
Publisher : BPFP Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/terra.8.2.87-95

Abstract

Landslides are a major hazard in Indonesia’s volcanic terrains, where highly weathered pyroclastic rocks and intense rainfall frequently trigger slope failures. This study aims to identify geological, geomorphological, and soil physical factors controlling slope stability within the Semilir Formation of Gunungkidul, Yogyakarta. Field observations and laboratory analyses were conducted to compare outcrops affected by translational landslides with adjacent stable slopes. Key parameters include bedding orientation, soil bulk density, plasticity index, and water retention capacity. The results indicate that dip-slope bedding orientations strongly predispose slopes to translational failure, whereas counter-dip structures enhance stability. Landslide-prone slopes exhibit higher bulk density, lower plasticity, and reduced water-holding capacity, which accelerate saturation and decrease cohesion during intense rainfall. In contrast, stable slopes possess higher plasticity and greater water retention, often reinforced by vegetation roots. These findings highlight the combined role of geological structure and soil properties as reliable indicators of landslide susceptibility. The study’s novelty lies in its outcrop-scale comparative approach within a single volcanic formation, providing practical implications for slope management through vegetation reinforcement, improved drainage, and locally calibrated rainfall thresholds.  Full text pdf
Estimasi Sumberdaya Andesit Dengan Metode Geolistrik Resistivity 2d Di Kabupaten Kulonprogo D.I.Y Kelvin Zain; Nurkhamim Nurkhamim; Aldio Kresna Pambayu; Faizal Agung Riyadi; Oktarian Wisnu Lusantono
JURNAL TEKNOLOGI MINERAL FT UNMUL Vol 14, No 1 (2026): Jurnal Teknologi Mineral FT UNMUL Juni 2026
Publisher : Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jtm.v14i1.25218

Abstract

Andesite is a vital industrial mineral commodity widely utilized as construction material, necessitating accurate information regarding its geometry and resource potential. To address the data requirements for construction material exploration, a geophysical investigation was conducted to estimate andesite resources using the 2-dimensional (2D) geoelectrical resistivity method in Dukuh Gunung Kukusan, Hargorejo Village, Kokap District, Kulon Progo Regency, Special Region of Yogyakarta. Field data acquisition was carried out on four survey lines utilizing the Wenner-Schlumberger configuration. The data processing stage involved 2D inversion using RES2DINV software, followed by 3-dimensional block modeling via Geosoft Oasis Montaj for volume calculation. Interpretation results indicate that fresh andesite is characterized by relatively high resistivity values, ranging from 1000–1870 Ωm, whereas weathered andesite is characterized by lower resistivity values, ranging from 300–800 Ωm. Fresh andesite is identified starting at an average depth of ± 15 meters below the surface, exhibiting a distribution pattern extending from Southwest to Northeast, which aligns with the regional geological structure. Based on 3-dimensional modeling, the estimated volume of fresh andesite resources is 95,875 m3 and the volume of weathered andesite is 160,125 m3. The results of this study are expected to provide valuable preliminary information for planning the utilization of andesite resources and serve as a reference for the application of the 2D electrical resistivity method in the exploration of construction rocks.
Co-Authors Devanda Ayu Lidya Permata Putri Djoko Mulyanto Dzikru Aminulloh Faizal Agung Riyadi Kelvin Zain Nurkhamim Nurkhamim Oktarian Wisnu Lusantono Vinni Lovita