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INDONESIA
Indonesian Journal of Earth Sciences
Published by MO.RI Publishing
ISSN : 27981134     EISSN : 27973549     DOI : https//doi.org/10.5262/injoes
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Environmental Science
Indonesian Journal of Earth Sciences is an open-access journal that publishes rigorously peer-reviewed research dedicated to our planet.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 85 Documents
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Analysis of the Relationship Between Resistivity and Seawater Moisture Content Percentage in Loose Sand Medium on the Yogyakarta Coastal Area Pratama, Yudha Agung; Paradise, Mycelia; Suharsono, Suharsono; Hidayat, Wahyu; Setiahadiwibowo, Ajimas Pascaning
Indonesian Journal of Earth Sciences Vol. 5 No. 2 (2025): July-December
Publisher : MO.RI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52562/injoes.2025.1767

Abstract

This study investigates the effect of seawater moisture content on the resistivity of unconsolidated sand in the coastal region of Yogyakarta. Laboratory experiments were conducted using a standard ASTM G-57 soil box with samples prepared at varying percentages of seawater moisture content. The results indicate that increasing seawater content in the sediment medium leads to an exponential decrease in resistivity. A mathematical relationship was established in the form of a power function: R=1145.7MC?2.23. Resistivity values tend to stabilize when the moisture content exceeds 13%. A resistivity range of 0.8–2.8 ??m is proposed as a cut-off for identifying seawater intrusion in coastal areas. These findings provide an important contribution to the development of geoelectrical methods for monitoring seawater intrusion and evaluating groundwater quality in coastal regions, which can serve as a basis for sustainable water resource management.
Evaluation and Optimization of Asphalt Production Parameters at the Asphalt Mixing Plant in West Sumbawa Sulaimansyah, Sulaimansyah; Wulandari, Miranti Nur; Fadli, Fadli; Wahyuni, Sri; Suhardi, Suhardi
Indonesian Journal of Earth Sciences Vol. 5 No. 2 (2025): July-December
Publisher : MO.RI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52562/injoes.2025.1915

Abstract

Asphalt is the main material in highway construction that plays an important role in determining the quality, durability, and comfort of road users. The demand for asphalt in Indonesia continues to increase in line with national infrastructure development, including in the West Nusa Tenggara region. PT Fima Kencana Kerthasari, located in Belo Village, Jereweh District, West Sumbawa Regency, is one of the companies engaged in the production of hot mix asphalt through a mixing plant facility. In practice, the production process often faces challenges in maintaining consistent asphalt quality due to variations in mixing temperature, inaccuracies in aggregate and asphalt measurements, and a lack of real-time process control. Considering the potential for quality improvement through the optimization of production process parameters such as temperature, mixing time, and aggregate-asphalt ratio, a systematic study at the PT Fima Kencana Kerthasari site is required. This optimization not only aims to meet technical specification standards (e.g., SNI 06-2489-1991 and SNI 7394:2008) but also to enhance the company's competitiveness through cost efficiency and operational efficiency.
Modern Ripples and Oxide Limestone at Pasir Padi Beach, Pangkalpinang, Bangka Belitung Province, Indonesia: A Case for Geotourism Development Ugi Kurnia Gusti; Alvera Noviyani
Indonesian Journal of Earth Sciences Vol. 6 No. 1 (2026): January-June
Publisher : MO.RI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52562/injoes.2026.1867

Abstract

Bangka Island, located in the eastern coast of Sumatra, is part of Indonesia’s unique and diverse geological heritage. Despite its potential, many of its coastal geosites remain poorly exposed and managed in terms of geoheritage value and geotourism development. This study focuses on Pasir Padi Beach, Pangkalpinang, aiming to evaluate its potential as a geotourism site using a integrated approach consisted of field surveys, geosite inventory assessment, and petrographic analysis of oxide-rich limestone from the Tanjung Genting Formation. Observations captured well-preserved modern ripple structures and dynamic shoreline processes that reflect active coastal sedimentation processes, offering valuable knowledge for both education and research. The site accessibility, combined with its past and modern geological features, showing it as a potential natural field laboratory for coastal sedimentology and geomorphology. Furthermore, the development of geotourism in this area bring a positive impact for supporting local economies through community engagement and sustainable tourism practices. The results support the inclusion of Pasir Padi Beach in Bangka Island geoheritage planning and recommend further efforts toward site conservation, interpretation, and integration into local tourism strategies towards becoming Unesco Global Geopark.
Integration of Geographic Information Systems in Determining Flood Risk Evacuation Routes in Medan City Muhammad Farouq Ghazali Matondang; Meilinda Suriani Harefa; Rohani; Eni Yuniastuti; Mulhady Putra; Rozi Mahmuda; Tengku Abdillah Azis
Indonesian Journal of Earth Sciences Vol. 6 No. 1 (2026): January-June
Publisher : MO.RI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52562/injoes.2026.1607

Abstract

This study aims to map flood risk evacuation routes in Medan City using the Network Analysis method based on Geographic Information Systems (GIS). Medan City is a flood-prone area due to rapid urbanization, inadequate drainage systems, and land use changes. The data used include the 2024 flood risk map, road network, and evacuation shelter locations. The evacuation route analysis was conducted using ArcGIS 10.8 software with the Network Analyst feature to determine optimal evacuation routes that avoid flood-prone areas and facilitate evacuation to safe locations. The results show ten main evacuation routes covering various districts in Medan City. These routes were designed based on accurate spatial data considering road conditions and flood risk zones. This evacuation route mapping is expected to serve as an important reference for local government and related agencies in planning flood disaster mitigation strategies and enhancing community safety. The GIS and Network Analysis approach proves effective as a planning tool for disaster evacuation by comprehensively considering geographical variables and transportation networks.
Geomorphological Characteristics of Denudational Landforms in Cibalong, Tasikmalaya Regency, West Java, Indonesia Muhammad Fachri Aditya Putra; Edy Sutriyono; Ugi Kurnia Gusti
Indonesian Journal of Earth Sciences Vol. 6 No. 1 (2026): January-June
Publisher : MO.RI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52562/injoes.2026.1957

Abstract

The Cibalong area, Tasikmalaya Regency, West Java, is dominated by denudational landforms developed on volcaniclastic and clastic rocks of the Jampang and Bentang Formations. However, systematic geomorphological documentation of denudational landforms in this area remains limited, particularly regarding the relationship between lithology, slope characteristics, drainage patterns, and active denudational processes at a 1:25,000 mapping scale. This study aims to analyze the geomorphological characteristics of denudational landforms and their relationship with lithological units in the study area. The methods used include interpretation of DEMNAS data with a spatial resolution of approximately 8.1 m, processed using ArcGIS 10.8, combined with morphographic and morphometric analysis, drainage pattern analysis, and field verification to identify relief, slope gradient, lithology, and active geomorphic processes. The results show that the Cibalong area is dominated by Low Denudational Hills and Denudational Hills units. Slope classes of 15–30% and 30–70% dominate the study area, indicating undulating to hilly relief. Denudational landforms mainly develop on tuff of the Jampang Formation and tuffaceous sandstone, sandstone, and claystone of the Bentang Formation, which are relatively susceptible to weathering and erosion. The sub-parallel drainage pattern and the presence of rotational slides indicate that denudational processes remain active. Therefore, the geomorphology of Cibalong is mainly controlled by lithological characteristics, slope morphometry, drainage development, and the intensity of denudational processes. These findings provide scientific insight into denudational landscape development in the Southern Mountains of West Java and offer practical baseline information for geomorphological mapping, slope hazard assessment, and land-use planning in similar hilly terrains.

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