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All Journal Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience Jurnal Teknik Sipil Journal of Geoscience, Engineering, Environment, and Technology JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Journal of Geosciences and Applied Geology Jurnal Ilmiah Dinamika Rekayasa
Teuku Yan Waliana Muda Iskandarsyah
Program Studi Teknik Geologi, Fakultas Teknik Geologi, Universitas Padjadjaran
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science Physics

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Characteristics of Groundwater Hydrochemistry and Stable Isotopes (δ18O & δ2H) in Cadasari, Banten, Indonesia Hidayat, Hadi; Yoseph, Boy; Muda Iskandarsyah, Teuku Yan Waliana
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 02 (2025): JGEET Vol 10 No 02 : June (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.02.21531

Abstract

Groundwater is an essential resource for drinking and domestic use, displaying significant diversity in volcanic regions.This study focuses on Cadasari, Banten, Indonesia, and aims to determine the hydrochemical characteristics of groundwater and the stable isotopes (δ18O & δ2H). Hydrogeological mapping was employed, and analytical data were collected from 20 groundwater sources, including springs, rivers, and wells, at elevations ranging from 167 to 928 meters above sea level. The hydrochemical analysis revealed various groundwater types, such as Ca-HCO3, Ca+Mg-HCO3, Na+K+Ca-HCO3, and Na+K+Ca-Cl. These variations in groundwater types are attributed to differences in volcanic lithofacies. Gibbs and Gaillardet’s diagrams indicate that water-rock interaction processes primarily influence the variability of these groundwater facies in Cadasari, highlighting the significant role of silicate minerals in the groundwater's geochemistry. The isotopic composition of borehole samples shows an average isotope ratio of -7.0 ‰ for δ18O and -41.7 ‰ for δ2H, while dug well samples have average ratios of -6.1 ‰ for δ18O and -34.9 ‰ for δ2H. Spring samples exhibit an average isotope ratio of -6.7 ‰ for δ18O and -39.3 ‰ for δ2H. The isotopic composition across the groundwater samples suggests that the water in this area is of meteoric origin.
The Determination of Disaster-Prone Areas Based on a Multifactor Approach on the Manglayang Catastrophe Volcano Edifice, West Java, Indonesia: English Putu Ayu Andhira; Faishal Aziz; Muhammad Ghozi; Teuku Yan Waliana Muda Iskandarsyah; Johanes Hutabarat; Hendarmawan
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.2.145

Abstract

Manglayang is an extinct volcano in West Java characterized by a horseshoe-shaped amphitheater morphology, suggesting a past volcanic sector collapse that generated debris-avalanche deposits. This study aims to identify evidence of sector collapse, characterize debris-avalanche deposits, and delineate stable, susceptible, and hazardous landslide zones. The methodology combines Digital Elevation Model (DEM) data, Desaunettes landform classification, geological field observations, lithological analyses, and slope stability assessment. The results reveal a southeast-facing amphitheater interpreted as the main sector-collapse scar. Hummocky landforms are widely distributed between 2 – 6 km from volcnic cone and supported by debris-avalanche deposits characterized by volcanic breccias with jigsaw-crack structures and abundant large boulders. The integration of geomorphological, lithological, and geotechnical parameters indicates that steep hilly terrains represent the highest landslide susceptibility, whereas hummocky terrains are generally stable under present conditions. The proposed multifactor approach provides a comprehensive framework for reconstructing ancient volcanic collapse processes and improving disaster-prone area mapping in extinct volcanic terrains.
Co-Authors Adji, Andika Rhadiya Putra Ahmadjayadi, Tigfhar Azwar Satrya Muhammad Bombom Rachmat Suganda Boy Yoseph Cahya Sunan Sakti Syah Alam Brilian, Ciria Humanis Fachrudin, Kurnia Arfiansyah Faishal Aziz Hadi Hidayat Hendarmawan Hendarmawan Hendarmawan ismawan, Ismawan ismawan Janner Rahmat Sudianto Nababan Johanes Hutabarat M. Nursiyam Barkah, M. Nursiyam M. Ridfan Trisnadiansyah Mafira Yuwandari MAHENDRA, GALIH AJI Mochamad Nursiyam Barkah Mohamad Sapari Hadian Muhammad Ghozi Muhammad, Azwar Satrya Nana Sulaksana Pramudyo, Tulus Putu Ayu Andhira Putu Ayu Andhira Rizka Maria Taat Setiawan Trisnadiansyah, Mochamad Ridfan Uus Ahmad Husaeni Virgianty, Aisyah Shafa Yudhi Listiawan