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Jambura Geoscience Review
Published by Universitas Negeri Gorontalo
ISSN : 26230682     EISSN : 26560380     DOI : https://doi.org/10.34312/jgeosrev
Core Subject : Science,
Earth & Planetary Sciences
Jambura Geoscience Review (JGEOSREV, P-ISSN: 2623-0682, E-ISSN: 2656-0380) is an open-access journal, which publishes original papers about all aspects of the Earth and Geosciences. This comprises the solid earth, the atmosphere, the hydrosphere, and the biosphere. In addition, it provides a particular place, and an advanced forum, for contributions on natural hazards, geoscience-related environmental problems.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 97 Documents
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Rock Mass Classification Using RMR and GSI for Slope Stability at PT Bukit Asam, Tanjung Enim Sabila, Dona; Harnani, Harnani; Qistan, Muhammad Hafits; Sidiq, Muhammad
Jambura Geoscience Review Vol 7, No 2 (2025): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v7i2.32492

Abstract

Evaluating slope stability in tropical open-pit mining environments remains a technical challenge due to the complex geological formations and the influence of dynamic climatic conditions, particularly intense rainfall and high humidity. This study aims to assess the effectiveness of integrating the Rock Mass Rating (RMR) system and the Geological Strength Index (GSI) for classifying rock mass quality and predicting slope stability in such settings. Field data were collected from interbedded claystone and sandstone formations through systematic mapping of RMR parameters, including Rock Quality Designation (RQD), spacing and condition of discontinuities, groundwater presence, and uniaxial compressive strength. Complementary evaluations using GSI focused on block structure, joint surface conditions, and weathering characteristics. The RMR analysis classified the rock mass as Class III (Fair Rock), indicating moderate stability. However, the system’s static framework and limited responsiveness to rapid hydrogeological changes posed constraints in capturing the actual slope behavior. In contrast, GSI, with values ranging between 40 and 50, offered enhanced interpretive depth by incorporating qualitative assessments of lithological heterogeneity and structural anisotropy. The adaptability of GSI proved critical in environments where visual and textural indicators of degradation fluctuate spatially and temporally. The combined application of RMR and GSI enabled a more accurate, context-sensitive geotechnical evaluation, bridging the gap between empirical rigidity and field-based complexity. This integrated methodology supports more reliable engineering decisions and enhances the predictive capacity for slope failures in tropical geological settings, emphasizing the necessity for multidimensional classification tools in geotechnical practice.
A Study Of The Late Neogene Tectonic Deformation of the Kayu Ajaran Region, South Bengkulu, Bengkulu Andrian, Fikri; Sutriyono, Edy
Jambura Geoscience Review Vol 7, No 2 (2025): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v7i2.31667

Abstract

This study investigates the tectonic deformation history of the Kayu Ajaran area in South Bengkulu through integrated geological structure mapping and Digital Elevation Model (DEM)-based lineament interpretation. The research focuses on reconstructing the sequence of tectonic events that occurred during the Late Neogene within the Bengkulu Forearc Basin, a region known for its complex tectonic setting. Fieldwork and remote sensing analysis identified twelve major structural features, comprising eight folds and four faults. These structures predominantly trend northwest–southeast (NW–SE), indicating a compressional stress regime oriented northeast–southwest (NE–SW). The fold geometries, ranging from upright to steeply inclined types, and fault types, including thrust, reverse, and strike-slip, suggest the reactivation of earlier Paleogene extensional structures during the Neogene compressional phase. Stereographic and kinematic analyses were used to determine the orientation of principal stress axes (σ1, σ2, σ3), supporting the interpretation of inversion tectonics. DEM-based lineament analysis enhanced the identification of structural trends and fault zones, especially in areas with limited outcrop exposure. The study provides a clearer understanding of the progressive tectonic deformation in the region and fills critical gaps in the structural characterization of the Kayu Ajaran area. These results contribute to broader regional tectonic models of southwest Sumatra.
Integrated DEMNas and Morphogenetic Analysis of Geomorphological Diversity in Salopa, Tasikmalaya, West Java Ramadan, Ikdan Rifki Muhamad; Rochmana, Yogie Zulkurnia
Jambura Geoscience Review Vol 7, No 2 (2025): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v7i2.31022

Abstract

This study presents an integrated geomorphological analysis of the Salopa area in Tasikmalaya Regency, West Java, combining field observations with advanced DEMNas (National Digital Elevation Model). The Salopa area has varied morphology with interesting relief. The diverse morphological features in the Salopa region are evidence of geological processes that have occurred. The focus of this research is to analyze and observe the geomorphology in the study area, aiming to identify the characteristics of the landscape and classify them. This study pioneers the combined use of DEMNas and morphogenetic analysis in Salopa, revealing seven landform units and their tectonic-fluvial interactions. Findings provide a baseline for landslide hazard mapping and sustainable land-use planning in West Java. The research methods used include field observation and systematic analytical approach in terms of morphometry, morphography, and morphogenetics, as well as analysis of the National Digital Elevation Model (DEMNas). Denudational High Hills (15%), Denudational Hills (60%), Structural Hills, Alluvial Plains (6%), Floodplains (10%), Denuded Karst Hills (25%), and Irregular Meander Channels (10%). These units reflect the interplay of tectonic activity, lithological variation, and fluvial processes. The study highlights the dominance of denudational processes, evidenced by landslides and dendritic river patterns, and contrasts the Salopa basin’s geomorphology with adjacent regions like Cibalong.
Geodiversity Inventory for Geotourism in Tanjung Api Central Sulawesi DM, abd Rahman; Fitriana, Tati; Botjing, Muslimin U.
Jambura Geoscience Review Vol 7, No 2 (2025): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v7i2.30709

Abstract

This study investigates the geological diversity of the Tanjung Api region in Tojo Una-Una Regency, Central Sulawesi, with the aim of identifying potential sites for geotourism and geological heritage designation. Through field observations, lithological and geomorphological mapping, petrographic analysis, and structural interpretation, ten geological sites were inventoried. Among them, Gua Kehidupan and Tanjung Api were identified as fulfilling national criteria for geological heritage due to their exceptional features, including fossil-bearing caves, sinkholes, and active gas seeps related to tectonic brecciation. The remaining sites exhibit significant geotourism value, particularly in coastal, volcanic, and sedimentary contexts. Findings from this study highlight the relevance of geodiversity in supporting sustainable tourism and geoconservation. By integrating geological features with educational and community-based values, Tanjung Api demonstrates strong potential to be developed into a geotourism destination that balances scientific significance, cultural relevance, and ecological preservation. The inventory and qualitative assessment serve as a reference for future geoheritage planning and site management. The study recommends involving local stakeholders in the promotion and conservation of these sites to ensure long-term sustainability and community benefits.
Spatio Temporal Modeling in Analyzing Temperature Humidity Index Using Google Earth Engine in South Sulawesi: Impact Analysis and Sustainable Mitigation Efforts Susiyanti, Susiyanti; Nasrul, Nasrul; Maddatuang, Maddatuang; Ruliana, Ruliana; Maru, Rosmini
Jambura Geoscience Review Vol 7, No 2 (2025): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v7i2.30644

Abstract

Climate change is one of the biggest challenges and threats to humanity today whose impact has very high dynamics. The high population density, population number, and population activity cause physical changes that affect the microclimate. Microclimate change can reduce people's thermal comfort/temperature humidity index (THI). The impact felt by the community is in the form of discomfort in outdoor activities, health risks such as heat stress, impact on agriculture and natural resource conservation, and animal health on farms to impact emergency response in disaster situations. Moreover, the summer of 2023, a record-breaking summer in 2023, continues the long-term warming trend, indicating the need for a study on the state of THI. This study aims to analyze THI trends and map the distribution of THI in South Sulawesi Province in 2013-2023. The method used in this study is a quantitative-descriptive method through a remote sensing approach using Google Earth Engine (GEE). The Temperature Humidity Index (THI) of South Sulawesi Province in the 2013-2023 time bracket with a cold category with a THI value of 21 °C has an area of 994384.62 hectares, the comfortable category with a THI value of 21°C – 24°C has an area of 1190393.32 hectares, the fairly comfortable category with a THI value of 24 °C – 26°C has an area of 1810662.30 hectares and the uncomfortable category with a THI value of 26°C has an area of 532780.13 hectares.
Identification of Relative Age and Depositional Environment of Gumai Formation Based on Characteristics of Planktonic and Benthonic Foraminifera in Carbonaceous Sandstone, Keban Agung Area, Lahat Regency, South Sumatra Province Yusar, Adri Taufiqurrahman; Idarwati, Idarwati
Jambura Geoscience Review Vol 7, No 2 (2025): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v7i2.29892

Abstract

The administrative location of the study area is in Keban Agung area, Lahat Regency, South Sumatra Province. This study aims to determine the age and depositional environment of the Gumai Formation of the study area based on the characteristics of planktonic and benthonic Foraminifera found. The abundant distribution of Carbonatan sandstone is an attraction to determine the depositional environment of the study area. The methods used in this research are literature study, field observation, micropaleontological analysis with relative age inference and micropaleontological analysis with P/B ratio calculation. Planktonic foraminifera fossils found in the study area are Orbulina universa, Globigerina praebulloides, Globigerina seminulina, Catapsydrax dissimilis, and Globigerinoides obliquus and benthonic foraminifera fossils found in the study area are Tubinella Inornata, Astrononion stelligerum, Hoglundina elegans, Quinqueloculina lamarckiana and Cibicides robertsonianus, then obtained the age and environment of deposition of the Gumai Formation in the study area based on the method of drawing relative age (Blow, 1969) and the P / B ratio, namely Early Miocene - Middle Miocene and Neritic Edge - Middle Neritic.
Mapping Flood-Prone Zone Using CMA and NDWI in Muaradua District, South OKU Rahmanita, Dwie; Idarwati, Idarwati
Jambura Geoscience Review Vol 7, No 2 (2025): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v7i2.28483

Abstract

Flooding is a recurring disaster in Indonesia, especially in vulnerable areas such as Muaradua District, South Ogan Komering Ulu. This study aims to delineate flood-prone zones using an integrated approach that combines Composite Mapping Analysis (CMA) and the Normalized Difference Water Index (NDWI). Six environmental parameters river density, soil type, land cover, rainfall, elevation, and slope gradient were processed using Geographic Information Systems (GIS) to generate a vulnerability index. Sentinel-2 imagery was used to detect actual inundation through NDWI computation. The findings show that 43.08% of the study area is slightly vulnerable, 33.02% vulnerable, and 4.59% very vulnerable, while NDWI analysis revealed that 12.31% of the total area was inundated. High-risk villages such as Pasar Muaradua and Pancur Pungah exhibited flood exposure levels exceeding 29%. Spatial overlay analysis demonstrated strong concordance between model-based vulnerability and observed inundation, validating the robustness of the integrated method. These results provide critical input for spatial planning and targeted flood mitigation efforts in the region.
Geomorphological Analysis of the Right Bank Area of Bulango Ulu Dam, Gorontalo Province Using Geological and DEM-Based Terrain Evaluation Suma, Muhamad Danial; Arifin, Yayu Indriati; Akase, Noviar
Jambura Geoscience Review Vol 7, No 2 (2025): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v7i2.28127

Abstract

This study investigates the geomorphological characteristics of the right bank area of the Bulango Ulu Dam in Gorontalo Province to support infrastructure planning, risk assessment, and sustainable land use. Employing integrated methods involving field observations and Digital Elevation Model (DEM) analysis, the research identifies two principal geomorphological units: Structural Low Hills (S1) and Fluvial Plains (F1). These units are shaped by the combined influence of endogenic processes, such as tectonic uplift and structural deformation, and exogenic processes, including fluvial erosion, sedimentation, and weathering. Lithological analysis revealed the presence of three main rock units diorite, granodiorite, and alluvial deposits each contributing to the area's terrain diversity and physical stability. Morphometric classification indicates that steep (30–70%) and very steep (70–140%) slopes dominate more than half of the study area, highlighting a high susceptibility to landslides and erosion hazards, particularly during peak rainfall seasons. The identification of a sub-dendritic drainage pattern suggests that geological structures play a vital role in directing surface runoff and sediment transport. The novelty of this research lies in its localized and detailed geomorphological assessment, which had not been previously conducted on the dam’s right bank. The findings have practical implications for dam safety, slope reinforcement strategies, and regional spatial planning under dynamic geological conditions.
Optimization of Groundwater Well Discharge Capacity Using Step Drawdown Test Post-Earthquake in Biromaru, Sigi District, Central Sulawesi Hamad, Harly; Aswadi, Muhammad; Lapalani, Cindy Ziqni Noviar
Jambura Geoscience Review Vol 7, No 2 (2025): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v7i2.27807

Abstract

The effectiveness of groundwater wells in tectonically active regions remains insufficiently understood due to the lack of integrative hydrogeological evaluations. This study aims to characterize the hydraulic performance of five groundwater wells in Biromaru District, Sigi Regency, an area affected by the 2018 Central Sulawesi earthquake. A combination of the Neuman method and the Hantush-Bierschenk approach was employed to evaluate key aquifer parameters, including transmissivity, storativity, specific yield, and well loss coefficients. Step drawdown tests and time-drawdown data were analyzed to determine aquifer responses under controlled pumping conditions. The results show a clear variation in transmissivity and storativity among wells, indicating heterogeneous subsurface characteristics possibly influenced by post-seismic compaction. Wells 1 and 3 demonstrated high transmissivity and efficiency, supported by C values below 0.5, signifying well integrity and optimal construction. Conversely, well 2 exhibited low hydraulic performance, suggesting lithological constraints or structural deficiencies. The combination of analytical methods provided a robust framework for interpreting aquifer-well interactions in a post-disturbance setting. This study contributes to a deeper understanding of groundwater behavior in seismically disturbed regions and emphasizes the importance of incorporating multi-method approaches in hydrogeological assessments. The findings can serve as a reference for groundwater resource planning, well rehabilitation, and adaptive water management in vulnerable areas like Sigi Regency.
Delineation of Nickel Laterite Based on Electrical Resistivity Tomography (ERT) Method at Kolaka Regency, Southeast Sulawesi Ruslan, Arya Raihan Nugroho; Yatini, Yatini; Wicaksono, Muhammad Arief
Jambura Geoscience Review Vol 7, No 1 (2025): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v7i1.22109

Abstract

Fulfillment of nickel laterite needs for various industrial purposes has become a government plan that must be realized immediately. The sustainability of the nickel laterite supply is the main reason for increasing exploration activities in various nickel laterite-producing areas in Indonesia. Nickel laterite explorations have been carried out in several areas, one of which is in Pomalaa District, Kolaka Regency, Southeast Sulawesi. The ERT (Electrical Resistivity Tomography) method combined with drilling and geochemical data is very suitable for delineating nickel laterite in the subsurface in three blocks. The purpose of this study was to obtain the distribution of nickel laterite in the subsurface and analyze its characteristics. This study used the Wenner configuration and 19 exploration drill points with geochemical assay data. The results of the study showed that there were three zones based on their resistivity values, namely the saprolite zone with a low resistivity value (35 Ωm), the saprolitic rock to boulder zone with a medium resistivity value (35 - 65) Ωm, and the bedrock zone in the form of peridotite rocks with a relatively high level of serpentinization, fracture and weathering, with a high resistivity value ( 65 Ωm). For characterization, the research area is divided into three blocks, namely West, Central and East Block. West block has low Ni content (0.96%) for the saprolite zone and (0.32 - 1.27) % for the saprolitic rock zone, and high (1.65 - 3.24) % for the saprolite zone and (1.35 - 2.27) % for the saprolitic rock zone. In the Central block, the Ni content is low in the saprolite zone of (0.27 - 1.37) % and the saprolitic rock zone of (0.26 - 1.30) %. While in the East Block, the Ni content is low (0.48 - 1.25) % for the saprolite zone, (0.03 - 1.29) % for the saprolitic rock zone, and high (1.34 - 2.94) % for the saprolite zone and (1.31 - 2.84) % for the saprolitic rock zone.

Page 8 of 10 | Total Record : 97

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