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INDONESIA
Journal of Geosciences and Applied Geology
Published by Universitas Padjadjaran
ISSN : 25793136     EISSN : 25793136     DOI : https://doi.org/10.24198/gsag.v7i3
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
Journal of Geological Sciences and Applied Geology (GSAG) is a National multidisiplinary Journal focus on Geological Sciences, Applied Geology, and Geological Engineering and Earth Science. Our Mission is to publish research related to (but not limited) Geology Petrology Paleontology Stratigraphy Sedimentology Remote Sensing Geomorphology GIS Engineering Geology Geotechnics Geochemistry Geophysics Geological Hazard and Disaster Geopark Hazard Mitigation Geography Earth Sciences
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 117 Documents
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Shallow Bearing Capacity in Cilengkrang, Bandung, West Java, Indonesia Nur Khoirullah; Annisa Ayungingtyas Pratiwi Adiwijaya; Irvan Sophian; Agung Mulyo; Dicky Muslim; Zufialdi Zakaria
Journal of Geological Sciences and Applied Geology Vol 3, No 3 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i3.26226

Abstract

Cilengkrang is located on the eastern side of Bandung City, West Java Indonesia. This area is surrounded by the district of Cimenyan, Cijambe, Cileunyi, and Ujung Berung. The population growth in Cilengkrang area has experienced 1.8% over the last six years as evidenced by the quantity of new housing complexes being built. Due the limitations on available land the development of housing complex is predicted settled in Cilengkrang District. This paper is aimed to determine the characteristic of shallow bearing capacity foundation, as an important factor on constructing a housing complex. To analyze shallow bearing capacity, the soil mechanics data is tested in the laboratory. These samples are taken in 14 sites distribute randomly.  Based on the field mapping, the soil that covers the research area is dominated by fine-grained soil as the residual and transported soil product of young and old volcanic products. Based on Universal Classification of Soil (USCS), the high plasticity silt (MH) is dominating this area than the low plasticity silt (ML) and high plasticity clay (CH). Based on shallow bearing capacity foundation data, the allowable bearing capacity in this area ranging from 19.42 to 70 Ton/m2 on square footing. The circular footing values ranging from 19.35 to 69.93 Ton/m2, and continuous footing values ranging from 15.47 to 52.77 Ton/m2.
CHARACTERISTICS OF DOLOMITIZED LIMESTONE OF PRUPUH FORMATION BASED ON PETROGRAPHY ANALYSIS IN SENDANG AGUNG, EAST JAVA Andri Perdana Putra
Journal of Geological Sciences and Applied Geology Vol 2, No 5 (2018): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i5.20243

Abstract

The East Java Basin is a large hydrocarbon producing basin in Java. From the drilling wells in thisregion it is known that the reservoir comes from carbonate rocks. The Prupuh Formation acts as areservoir because of its high porosity value, not only primary porosity but also secondary porosity.The study of limestone characteristics of Prupuh Formation in Sendang Agung Village, PaciranDistrict, Lamongan Regency, East Java Province is a combination of field and laboratory activities.Field activities include collecting data through detailed measurements, making measuredstratigraphic cross sections with systematic rocks sampling. Laboratory activities are petrographicanalysis through thin sections. The purpose of this study is to increase the knowledge aboutPrupuh limestone which acts as a reservoir in the East Java Basin oil and gas system. Based on theresults of the field activity, a measured stratigraphic section with a thickness of 32.5 meters wasmade, the lower and middle sections were composed of dolomite, then at the top there werebioclastic limestones as reported by Pringgoprawiro, 1983. A total of 6 (six) rock samples werechosen for petrographic analysis of thin sections. Results of the analysis obtained 32 meters is acrystalline dolomite with a very bad porosity system. Dolomite which is found is the result ofdolomitization of the wackestone bioclastics limestone. So it was concluded that the carbonaterocks the Prupuh Formation in research area had very bad potential to become reservoir rocks. 
Slope Stability Analysis on Muaraenim Formation, South Sumatera, Indonesia Thaha Rizal Ulhaque; Nur Khoirullah; Raden Irvan Sophian; Zufialdi Zakaria
Journal of Geological Sciences and Applied Geology Vol 3, No 2 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i2.23206

Abstract

Slope stability analysis is a necessary aspect in open mining operations. The research location is in the Muaraenim Formation, South Sumatra, Indonesia. In this study, the level of slope stability is determined by the value of the Safety Factor (FS). The method used is limit equilibrium, the Spencer method. The results of this study indicate that FS values are influenced by the angle of the slope, where with decreasing degree of slope, the FS value will increase. In addition, the FS value is also directly proportional to the cohesion value of the slope materials.
METHOD TO IDENTIFY THE FACIES ASSOCIATION ARCHITECHTURE BASED ON CORE ANALYSIS Reza Mohammad Ganjar Gani; Yusi Firmansyah; Rifky Nurdeani
Journal of Geological Sciences and Applied Geology Vol 2, No 3 (2017): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i3.15755

Abstract

Rock is a very important in knowing the geological processes that developed in the past and present. The geological processes recorded in the core rock or often known as the core. Core is a rock of subsurface drilling. From the rock core can be known the characteristics of rocks ranging from megascopic and microscopic characteristics. The results of megascopic and microscopic analysis will be known facies, deposit environments, facies associations and architecture. The data contained 3 rocks that have been in the description, after the analysis there are 3 facies including the foraminifera limestone, sandstone foraminifera and claystone foraminifera. The foraminifera limestone is deposited on the Patch Reef Interior Platform environment, the foraminifera sandstones are deposited on the Restricted Interior's platform environment and the foraminifera claystone is deposited on the Open Marine Interior Platform environment. All three facies are integrated into the facies association Restricted - Open Marine Platform.Keywords : Core, Facies, Facies Association
CHARACTERISTICS, RANKING, AND POTENTIAL OF COAL ON SEAM H AND SEAM H2 ALIF DILANDY RIZKY; Nurdrajat Nurdrajat; Adi Hardiyono; Silti Salinita
Journal of Geological Sciences and Applied Geology Vol 7, No 3 (2023): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i3.50364

Abstract

Coal is a complex solid object consisting of several chemical elements and comes from plants that are deposited in a basin. The South Sumatra Basin is a basin with the presence of the Muara Enim Formation which is known as a coal-bearing formation. In this research, secondary data was used in the form of proximate analysis, ultimate analysis, and combustion properties analysis results in determining the characteristics, ranking, and potential of coal in the research area. Based on ASTM D 388 – 05 classification, coal in seam H has a Subbituminous B Coal ranking, while seam H2 has a Subbituminous A Coal rating. Based on the parameters in assessing the coal potential use for coal-fired power plants according to Thomas, 2013 in Suhat, et al., 2020, coal in seam H and seam H2 does not support the utilizations, but solutions can be carried out in the form of rewashing sample, coal drying, and coal blending.
Erosion Potential Based on Erodibility Factors In Cimanggung And Surrounding Region, Sumedang Regency, West Java, Indonesia Nisa Shafira Muthia Rahmi; Raden Irvan Sophian; Nur Khoirullah; Zufialdi Zakaria
Journal of Geological Sciences and Applied Geology Vol 5, No 2 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i2.34661

Abstract

The research area around Gunung Geulis has been shifted from agricultural land into residential areas. This transformation eventually will affect the water infiltration process especially throughout the rainy season and can cause the intensity of the erosion rate to go higher. Soil erodibility is defined as the susceptibility of the soil to erosion, as the degree to which a soil is easily eroded or not. This research was conducted to determine the erodibility value in an area of ± 25 km2 which administratively belongs to the Districts of Cimanggung and Jatinangor, Sumedang Regency, West Java Province. The erodibility value can be calculated by the method introduced by Wischmeier and Smith (1978) and it is determined based on several parameters, namely texture of the soil, soil structure, permeability value, and organic (%C) content in a soil sample. The research data was obtained by engineering geological mapping of the distribution of surface soil, taking undisturbed soil samples using the hand auger method, and laboratory tests in the form of testing the physical properties of the soil. Then several laboratory tests are conducted to identify the physical properties of soil such as organic (%C) content analysis using Walkley and Black method, grain size analysis, hydrometer analysis, and permeability analysis using the falling head method. In the research area, the soil type is divided into two units, namely the Low Plasticity Silt Unit and the High Plasticity Silt Unit. Soil erodibility values around Gunung Geulis ranged from 0.118 to 0.514 0,1-ton acre hour/acre foot-ton inch which was included in the classification of a low, medium, moderately high, and high erodibility levels according to US customary dimensions.
Combining geological surface data and geostatistical model for Enhanced Subsurface geological model Muhammad Kurniawan Alfadli; Nanda Natasia; Iyan Haryanto
Journal of Geological Sciences and Applied Geology Vol 2, No 2 (2017): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i2.13451

Abstract

AbstractThis paper emphasis the use of geological information gathered from surface mapping and subsurface data, the method that used was mainly utilizing statistical information and deterministic model interpreted. Comparison model was built to calculate the deviation between realization, the calculation was furthered can be used as a uncertainty to make a better decision to choose the best realization. Geostatistics is a branch of statistics focusing on spatial or spatiotemporal datasets. In geology, geostatistical is used for numerical calculation of subsurface approach with several data such as geophysical or geological observation. Geostatistics modelling have several parameters setup to obtain best approach model. The parameters namely lithological boundary, geological structure and random seed number. Process for modelling used 23 drilling data with various lithological type. Two type geostatistical method is applied for the data that is Indicator Kriging (IK) and Sequential Indicator Simulation (SIS) with grid size 1000x1000 and 2000x1500. Distribution of lithology begin without parameters. Resulted shown that the model not appropriate with geological surface data and mismatch lithology position. To obtained better model, several geological information is included before geostatistical calculation. From regional geology surface data is obtained geological formation within lithological information. Then, geological structure describes the geology fault and formation boundary.Keywords: Geostatistics, subsurface, enhanced model, variance, random seed number
SWELLING POTENTIAL OF CLAY SOIL KALIWANGU FORMATION IN CIBOGO DISTRICT, SUBANG REGENCY AREA BASED ON ITS BASIC PHYSICAL PROPERTIES Rio Akmal Rizky Prasetio; Raden Irvan Sophian; Yusi Firmansyah; Nur Khoirullah
Journal of Geological Sciences and Applied Geology Vol 7, No 2 (2023): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i2.49958

Abstract

The research is conducted in Cibogo District, Subang Regency. Focus of the research is taking samples in area inside Kaliwangu Formation by doing field observation and field sampling using disturbed sample method then it will be tested in laboratory for its basic physical properties. Result of its basic physical properties will be analyzed to determine their swelling potential by taking 5 sample of soil from Kaliwangu Formation. Based on sieve analysis every sample of Kaliwangu Formation (Pk) have more than 50% of clay fraction for each sample, and based on Atterberg limit test Kaliwangu Formation (Pk) samples are dominated by Silt High Plasticity (MH) soil with 3 samples of the MH type and only 2 samples of the CH type. According to consistency limit test of Kaliwangu Formation (Pk) soil, the swelling potential can be determined by classify it based on liquid limit (%) and plasticity index (%) using swelling potential classification. Using the soil consistency value, especially the liquid limit value and the plasticity index value, it can be classified as the swelling potential of Kaliwangu Formation (Pk) classified as high - very high potential with a very high dominance.
QUANTITATIVE GEOMORPHOLOGY EXPRESSION OF GEOLOGICAL STRUCTURES USING SATELLITE IMAGERY AND GEOSPATIAL ANALYSIS: AN EXAMPLE IN THE SOUTHERN PART OF MERAPI MOUNT, YOGYAKARTA, INDONESIA Herry Riswandi; Emi Sukiyah; Dina Tania
Journal of Geological Sciences and Applied Geology Vol 4, No 3 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i3.32228

Abstract

Research using morphotectonics parameters from a 30-m digital elevation model to evaluate satellite imagery data. It process by contour, slope, aspect, and hillshade analysis of geographic information system tools. For geological lineaments, drainage patterns and their relation with geological structures. Data analyzed in digital format reveals the lineament identifies 116 segments in north-south and east-west polar direction, with length from 0.2 to 4.6 km. Quantitative geomorphology is based on the slope and valley dimension in four watersheds to recognize recent tectonic activity located on the southern slopes. Digital quantitative geomorphic analyzed volcanic slope area to generate data along with the tectonic evolution in annual eruption. Furthermore, the results become references for recent tectonic activity on the volcanic slopes, with several exceptional values of the four watersheds. That indices of bifurcation ratio, drainage density (3.44-4.76), sinuosity of mountain front (3-4), valley floor width to valley height ratio (0.021-0.32), asymmetry factor (16.7-2), streams length gradient index (5.9-12.2),  hypsometric (h/H 0.4-0.6 and a/A 0.4-0.5), transverse topography symmetry (0.47-0.87), elongation of basin ratio (0.003). The analyzed data results that structures are shifting. The geomorphological index can support tectonic activity assessment through the deformation of land from various volcanic deposits, uplift rate, and asymmetric river maturity.
PROSPECTIVE ZONE AREA FOR AGRICULTURE AND RESIDENTIAL BASED ON GEOLOGICAL DISASTER POTENTIALS IN SOUTH BANDUNG REGION NANA SULAKSANA; Teuku Yan Waliana Muda Isandarsyah; Achmad Rifai; Pradnya Paramarta Raditya Rendra; Murni Sulastri
Journal of Geological Sciences and Applied Geology Vol 3, No 1 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i1.21366

Abstract

The number of residents in Bandung continues to increase every year, especially in the southern part of Bandung. The development of residential areas needs to get attention from the local government and people in Bandung, especially to evaluate various geological hazards such as floods, landslide, earthquake, and other. Research methodolgy is qualitative method by interviewing local community and analyzing landsat image using Google Earth and Digital Earth Model (DEM) image to know land use in the research area. In addition, quantitative methods are also used with superimposed manual statistical analysis and weighting methods using Microsoft Excel, Global Mapper, and Mapinfo software. The result of research shows that South Bandung area has Land Suitability Score > 130 (Residential Area) and Land Suitability Score > 135 (Agriculture Area) which are categorized as very good settlement and education area; Land Suitability Score 116-130 (Residential Area) and Land Suitability Score 92-135 (Agriculture Area) are categorized as an obstacle area with various constraints such as water supply, disaster, and others but can still be overcome by artificial engineering. Land Suitability Score <116 (Residential Areas) and Land Suitability Score <92 (Agricultural Area) are limitation area that are not feasible to be used as residential and educational areas, a variety of constraint reduction efforts can be done but require very high cost. Therefore it is suggested  to convert the area into conservation. It is concluded that the best areas to be used as residential and agricultural areas are located in the Banjaran District such as Banjaran, Kamasan, Sindangpanon, and Tarajusari Village.

Page 8 of 12 | Total Record : 117

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