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Journal of Earth and Marine Technology (JEMT)
Published by Institut Teknologi Adhi Tama Surabaya
ISSN : -     EISSN : 27238105     DOI : https://doi.org/10.31284/j.jemt
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Physics Transportation
Earth Science and planetary, Geology, Geochemistry, Geophysics, Geodesy, Geomatics, Geotech, Rock mechanics, Mining engineering, Natural Disaster, Land and ocean development, Natural resources, Environmental science, Social impact of mining and marine activity, Science and technology in mapping and surveying, Optical remote sensing and radar remote sensing, Cadastre and 3D modeling, Geodynamics theory and application, Geospatial, Land Surveying, Geomarine, Photogrammetry, Marine engineering
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 174 Documents
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Provenance Analysis from Lemat Formation in Lubuk Lawas and Lubuk Bernai Areas, Jambi Subbasin, Jambi Province Daryono, Sapto Kis
Journal of Earth and Marine Technology (JEMT) Vol 5, No 1 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v5i1.7242

Abstract

The study of the sedimentary rocks from the Lemat Formation in Bukit Tigapuluh, particularly in the Lubuk Lawas and Lubuk Bernai Areas, aims to clarify and provide an overview of the formation’s history and the evolution of Paleogene stratigraphy within the Jambi Subbasin. Provenance analysis was concluded using petrographic analysis to determine the classification of sandstone types, source rock characteristics and tectonic order. Sandstones in the Lubuk Lawas and Lubuk Bernai areas are classified into Lithic arkose, arkosic, subarkose, felspathic litharenite, silty claystone, sublitharenite and subarkosic wacke. Petrographic data revealed that these sandstones originated from a tectonic setting within the recycled orogenic zone, with sub-zones varying between quartzose recycled, transitional recycled and mixed. This variation indicates a combination of primary source rocks and recycled orogens. Paleocurrent data derived from the sedimentary structures of sandstones in the Lubuk Bernai area suggest deposition directions from the southwest and southeast.
Impact of Land Subsidence-Induced Three-Dimensional Surface Deformation on Infrastructure in the Semarang-Demak Alluvial Plain, Indonesia Azeriansyah, Reyhan; Ching, Kuo-En; Darmo Yuwono, Bambang
Journal of Earth and Marine Technology (JEMT) Vol 5, No 2 (2025)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2025.v5i2.6841

Abstract

We estimated surface deformation using SBAS-InSAR and the Mogi Source Model is then adopted to elucidate the mechanisms and spatial variability of surface deformation within the Semarang-Demak Alluvial Plain and its impacts on infrastructures. By analyzing predicted vertical and horizontal velocities, we identify intensive groundwater extraction as the primary driver of aquifer compaction, with vertical subsidence exceeding -120 mm/year and volume loss rates surpassing -6,000 m³/year in the urbanized Semarang-Demak region. These findings highlight the three-dimensional characteristics of deformation, forming a characteristic “bowl-shaped” pattern and revealing the sensitivity of infrastructure—expressways, railways, national roads, local roads, and airports—to high strain and tilt gradients. The integrated analysis thus underscores the necessity of sustainable groundwater management and adaptive land-use strategies to mitigate deformation-induced risks. This approach is crucial for safeguarding the long-term functionality and resilience of vital infrastructure in this subsidence-prone coastal region, guiding decision-makers toward strategic and sustainable development practices.
Determination Coal Mine Ultimate Pit Limit based on Kepmen ESDM No. 227.K/MB.01/MEM.B/2023 and PP 26 2022 Suparno, Fanteri Aji Dharma; Aminah, Siti; Haeruddin, Haeruddin; Lestari, Rina; Mulyani, Kurnia Dewi; Manek, Emanuel; Sulistyo Rini, Utari Retno
Journal of Earth and Marine Technology (JEMT) Vol 5, No 2 (2025)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2025.v5i2.7236

Abstract

Economic factors and variables from geological resource models affect ultimate pit limit (UPL). Coal selling price, overburden stripping cost, coal mining cost, and royalties are among the economic factors taken into account in UPL. PP 26 2022 and Kepmen 227.K/MB.01/MEM.B/2023 both control the benchmark coal selling price and royalties. It takes a lot of time to determine UPL utilizing the Lerchs Grossman (LG) algorithm. UPL optimization is now feasible by integrating mining modelling software's Structured Query Language (SQL). The goal of this study is to determine UPL by maximizing coal resources at the site using the help of SQL in LG algorithm, which can optimize pits efficiently, precisely, and economically while taking the most recent laws into account. The study investigates a coal mine in Sanga-sanga, East Kalimantan. The study entails examining data processing using secondary data that was gathered for the study. Using the break-even stripping ratio (BESR) analysis approach, mining limitations are chosen. The chosen incremental stripping ratio (ISR) of 12.88 is in close proximity to the $13.41/ton break-even stripping ratio (BESR). The grid OPT015 in the optimization grid contains the incremental stripping ratio (ISR) value and considered as the UPL for the coal mine.
Neutralizing Acid Mine Drainage (AMD) and Reducing Iron (Fe) and Copper (Cu) Content Using Biomass Adsorbents Hendriono, Hendriono; Cahyadi, Tedy Agung; Ernawati, Rika
Journal of Earth and Marine Technology (JEMT) Vol 5, No 2 (2025)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2025.v5i2.6816

Abstract

Mining is an activity that always has an impact on the environment. The adverse effects that cannot be separated from the mining process are mined acid water, where the process of mining acid water occurs due to contact between sulfide rocks and air or water; environmental pollution by mined acid water must be overcome immediately, in the prevention of ecological damage by mine acid water, Various methods are carried out to reduce the impact of mine acid water pollution, one example of a technique that is often used is with limestone channels, where the gaps are filled with limestone fragments to neutralize mine acid water, The method used in this study is an experimental design with an adsorption process. The data collection method in the study uses literature studies, field observations, research preparations, rice husk preparation, coconut coir, and fine coal, Acid Water samples are taken and brought for the testing process. The test results using a pH meter at the Yogyakarta Center for Environmental Health and Disease Control Engineering (BBTKLPP) showed that the pH of AAT was 3.8. Based on the results of the AAS test at BBTKLPP Yogyakarta, the AAT sample contained Fe metal of 130.56 mg/L and Cu of 2.96 mg/L. The highest adsorption effectiveness was in a 3x24 hour adsorbent experiment with a period of 50 grams with a time of pH 45.71%, Fe 98.90%, and Cu 98.71%.
Landslide Susceptibility Zonation Using Analytic Hierarchy Process Method in the Karangbolong Hills Area, Indonesia Susilowati, Susilowati; Radityo, Daniel; Aminulloh, Dzikru; Rahayu, Ririn Wuri
Journal of Earth and Marine Technology (JEMT) Vol 5, No 2 (2025)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2025.v5i2.7346

Abstract

The highest frequency of landslides in Kebumen Regency is observed in the Ayah Subdistrict and Buayan Subdistrict, which are in the southern part of the Karangbolong Hills. This area are the targets for the construction of the 14.03 km Ayah-Jladri Southern Cross Road (JJLS). Consequently, the objective of this study is to create a landslide susceptibility map utilizing the Analytic Hierarchy Process (AHP) methodology. Some causative factors are used to develop landslide susceptibility maps i.e. elevation, slope gradient, aspect and curvature, lithology and lineament density, distance from streams, land use and distance from roads. A total number of 128 landslide events are considered in the study. This method identified five susceptibility zones based on LSI value: very low (141.79-241.74), low (241.75-293.73), moderate (293.74-334.52), high (334.53-374.89), and very high (374.90-460.50). The landslide susceptibility map was validated, with an AUC value of 0.749, suggesting that the map provides good results.
Optimization of Drilling Sample Handling in Laterite Nickel Exploration in Central Sulawesi Gunawan, Risal; Prianata, Yogi Laode; Rinaldi, Ahmad Jeli; Joaques, Juan
Journal of Earth and Marine Technology (JEMT) Vol 5, No 2 (2025)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2025.v5i2.7246

Abstract

The exploration of lateritic nickel in Indonesia plays a crucial role in meeting the demands of the electric vehicle battery and stainless-steel industries. One of the critical aspects of exploration is proper handling of drilling samples to ensure the accuracy of geochemical and mineralogical data. PT. Cakrawala Resources Indonesia has implemented standard procedures for sample management at the Sambalagi Site. However, challenges remain regarding storage, transportation, and quality control, which may affect the integrity of exploration data.  The purpose of this research study was conducted using a field study approach and technical analysis of sample handling procedures, covering site preparation, drilling, and storage in the sample house. The evaluation was carried out by observing the effectiveness of each stage and identifying factors that could potentially cause sample degradation. Additionally, a review of quality control system implementation was conducted, including sample duplication methods and blind sampling. The research results indicate that the applied sample handling methods comply with exploration standards. However, challenges remain, such as high humidity conditions that can affect sample quality and difficult-to-access terrain that may hinder transportation processes. While quality control measures have been implemented, optimization is still needed in record-keeping and storage to enhance data traceability. Improvements in sample house storage conditions, sample transportation optimization, and the implementation of a digital recording system are recommended to enhance exploration efficiency and accuracy.
Anisotropic Deformation Mechanism in the Twin-Tube Tunnel Sections: Empirical Insight from Multi-Point Displacement Monitoring Khelalfa, Houssam; Tekkouk, Mustapha; Boumehraz, Mohammed-Amin
Journal of Earth and Marine Technology (JEMT) Vol 5, No 2 (2025)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2025.v5i2.7579

Abstract

This study evaluates the stability of a twin-tube tunnel through a combined approach of rock mass classification, numerical modeling, and real-time deformation monitoring. The rock mass along the tunnel alignment was characterized using the Rock Mass Rating (RMR) system, incorporating physical, geological, and geotechnical data from the project site. Support systems were designed for each geotechnical unit based on RMR and the Q-system support chart. Field monitoring was conducted over one year using a Leica TS09 tachometer and 3D displacement monitoring targets installed at the top heading and invert/bench, with data processed via Amberg Tunnel 2.0 software. Complementing the field measurements, 2D numerical analyses were performed to assess the left portal slope stability (Slide 6.0 software) and provisional support behavior (Phase2 2D program). The numerical results were validated against in-situ monitoring data, demonstrating strong agreement. The study confirms effective rock mass deformation control and satisfactory confinement stability, highlighting the reliability of the integrated methodology for tunnel stability assessment.
Calculation of coal resources and reserves using the cross-section method in the mining plan area of PT. Sentosa Prima Coal in Mersam District, Batang Hari District, Jambi Azis, Muhammad Jundi Haikal; Fanani, Yazid
Journal of Earth and Marine Technology (JEMT) Vol 3, No 1 (2022)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2022.v3i1.3603

Abstract

PT. Sentosa Prima Coal is a company engaged in the Coal sector. This company is located in Mersam District, Batanghari Regency, Jambi Province. The area of the mining business permit of PT. Sentosa Prima Coal of 2000 Ha. Mining activities require reserve calculations before mining activities are carried out, including making a coal deposit model, calculating coal resources, pit design, calculating coal reserves, and calculating the stripping ratio (SR) value, so that later the number of coal reserves can be obtained and obtain a deposit model. The modeling and calculation of reserves were carried out using the "cross-section" with the help of Surpac 6.6.2 software. Based on the Cross Section's estimation results, coal resources for PT. Sentosa Prima Coal amounted to 8,073,932 tons, and coal reserves 6,662,514 tons, the volume of Overburden for the planned mining activity area was 24,779,981 BCM, and the stripping ratio value was obtained 1:4.
The detailed geological investigation in Kadidia geothermal field and surrounding areas, Nokilalaki District, Sigi Regency, Central Sulawesi Province Firmansyah, Irwan; Siswandi, Siswandi; Iswahyudi, Sachrul; Hermawan, Dudi; Mustofa, Santia Ardi
Journal of Earth and Marine Technology (JEMT) Vol 2, No 2 (2022)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2022.v2i2.2870

Abstract

The need for alternative energy other than fossil energy is felt to be increasingly urgent for the fulfillment of domestic electrical energy. In meeting the demand for electricity, the government needs to investigate alternative geothermal energy, to find out the potential for geothermal energy to provide electricity. The realization of this policy is that the government conducts an integrated geothermal investigation to find prospective geothermal areas that can be developed as electric power. Nokilalaki District, Sigi Regency, Central Sulawesi Province is one area that has geothermal potential in Indonesia. The Kadidia geothermal area, Sigi Regency, Central Sulawesi Province is one of the volcanic geothermal fields that have good potential and needs to be investigated further, especially on geological conditions that affect the presence of geothermal energy. The research method used is the method of analyzing the results of field observations. From the observations, it can be concluded that the geomorphology of the research area is divided into Tongoa hills, Nokilalaki Granite Intrusions, Kamamora Hills, and Kadidia Alluvial Plains. The stratigraphy of the study area from old to young consists of Breccia, Sandstone, Granite Intrusion A, Granite Intrusion B, Granite Intrusion C, and Alluvial Plain. The geological structure of the study area consists of the Kamamora sinistral shear fault and the Kadidia dextral shear fault. The geological history of the study area begins in the early Miocene which is the beginning of the movement of the Palu - Koro fault.
The influence of tectonics on underwater morphology of the Arafura Sea by using seismic refraction in West Papua, Indonesia Jusfarida, Jusfarida; Wijaya, P Hadi; Syafri, Idriem; Hardjana, Budhi
Journal of Earth and Marine Technology (JEMT) Vol 2, No 2 (2022)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2022.v2i2.2902

Abstract

The Arafura waters are part of the northern edge of the Mesozoic Passive Margin of Australia. The movement of plates on the ocean floor results in the formation of reliefs on the seabed, these reliefs are commonly referred to as seabed morphology. Tectonic activity on the Tarera-Aiduna fault, until now still plays an important role and controls conversion tectonic activity in this area. Collision between plates or subduction is the eventuality quality of a collision between plates, where one plate plunges downwards, forming an ocean trench. The seabed is a very deep and narrow seabed, the walls are steep and steep with a depth of more than 200 m. The purpose of this study was to determine the morphological formations on the seabed caused by tectonic activity, so as to obtain what tectonic processes are working in the area. The method used in this research is to analyze the data generated by the survey ship Geomarine III, owned by P3GL, Ministry of Energy and Mineral Resources. The data used are Marine seismic data and Bathymetry data, analysis of seismic data is intended to determine rock layers, and the geometric shape of the structures that develop in the area, while Bathymetric data analysis is intended to determine the depth of sea water, which is also used to determine reliefs. Or morphology under the seabed. The results of the analysis are in the form of morphological formations on the ocean floor starting from the Exposure area to the Aru Trench.

Page 16 of 18 | Total Record : 174

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