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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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Stable Slope Design Based On Limit Equlibrium Method (Lem) And Finite Element Method (Fem) At Pit X, Lahat, South Sumatra MUHAMAD NUR BAGASKORO; Raden Irvan Shopian; Aldrin Ramadian
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.v7i3.53006

Abstract

Coal mining process using open pit mining method is closely related to slope stability. A slope whose stability is disturbed will have a higher potential for landslides. The slope stability analysis in this research is conducted by Limit Equilibrium Method (LEM) with the calculation of Morgenstern-pice slice method and Finite Element Method (FEM) with the calculation of Shear Strength Reduction. The highwall simulation was modeled with a Bench height of 10 meters, Bench width of 6.5 meters and bench tilt angle varying between 30°, 45°, 60° and groundwater condition using steady state FEA. From the results of the LEM analysis on the highwall with a bench tilt angle of 30 °, 45 °, 60 ° has a safety factor value of 1.005; 0.76; 0.584. While the results of the FEM analysis on the highwall with a bench tilt angle of 30 °, 45 °, 60 ° have a Strength Reduction Factor value of 0.98; 0.72; 0.57. Comparison of the safety factor values of the two methods has an average difference of 1-2%. This is because the FEM takes into account the stress-strain in the material which describes how the material behaves. The stable slope design based on LEM is a highwall slope with a Bench slope angle of 22° which has a safety factor value of 1.478 and based on FEM is a highwall slope with a Bench slope angle of 22° which has a Strength Reduction Factor value of 1.42.
High Permeability Zone On Geothermal Manifestations Using Fault Fracture Density In Sembalun Area, Lombok Yusuf Zaki Agung; Agus Didit Haryanto; Adi Hardiyono; Dede Iim Setiawan; Widya Asoka Suleman
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.v5i2.34937

Abstract

Geothermal manifestations can occur in zones of high permeability. Permeability zones can be analyzed through lineament density, assumed to be associated with faults and fractures which are considered as weak areas that can allow geothermal fluid to pass from reservoir to the surface. This study intends to determine the zone with high permeability in geothermal manifestations. Modeling of surface data in the form of lineament pattern can be analyzed with Fault Fracture Density (FFD) analysis. The lineaments pattern is obtained based on the appearance through DEMNAS satellite imagery. The lineaments pattern deliniated by providing lighting from several angles, from lighting azimuths of 0°, 60°, 120°, 180°, 240° and 300° at a constant altitude of 45°. FFD analysis shows geothermal manifestations appear in the high permeability zone in the Sembalun area, Lombok.
Lithofacies of the Halang Formation in the Cijurey River-Majalengka . Abdurrokhim; Yusi Firmansyah; Nanda Natasia; Mulyana Saputra
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.v2i3.15614

Abstract

This report discusses lithofacies composition of the upper part Halang Formation that is well exposed along the Cijurey River, Majalengka - West Java.  A total of 450-m-thick continues section of the Halang Formation have been measured and described. The lithofacies composition of the Halang Formation in the Cijurey River consists of alternating thin- to very thin-bedded sandstones and mudstone, un-bedded mudstones, very thick pebbly mudstones, breccia and slump. Andesitic igneous rock intruded locally to this formation.
SOIL ERODIBILITY AND ITS EROSION POTENTIAL IN SADAWARNA DAN AND SURROUNDING AREA, CIBOGO DISTRICT, SUBANG REGENCY, WEST JAVA PROVINCE Salsabila Nur Alpionisa; Zufialdi Zakaria; Nur Khoirullah; Raden Irvan Sophian; Yusi Firmansyah
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.v7i2.49995

Abstract

The Sadawarna Dam and its surroundings, which are located in Subang Regency, are currently under construction. Change in land use caused by the construction occurred. Land management and soil conservation are needed to prevent uncontrolled erosion because it can caused slopes in critical condition, flood occurred in the downstream areas of river, and silting of dam. One of the information in land management and soil conservation is by identifying the soil erodibility which aims to find out the sensitivity of the soil to erosion in the research area. Soil erodibility affected by grain size distribution, soil structure, soil organic matter, and soil permeability. In this research area, the soil erodibility was calculated based on disturbed sample in the field which was then tested in the laboratory. The laboratory tests include sieve analysis, hydrometer analysis, and %c organic. Soil permeability obtained from previous studies. The research area is dominated by clay-sized soil which are the result of weathered claystone in Subang Formation. Soil erodibility value in the research area ranged from 1,100 – 0,448 t ha h/ha MJ cm with dominance of low soil erodibility classes. The dominance of clay-sized soil causes low soil erodibility value because clay sized soil has cohesive properties so it tends to be difficult to erode.
Geophysical Approach And Geochemistry Correlated To Discover Underground Water Flow Indicator To Mud Volcano In Quarter Volcanic System Pandji Ridwan; Kurnia Arfiansyah Fachrudin; Aldrin Ramadian; Kemala Wijayanti
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.v4i3.32220

Abstract

No less than 108 million meter3 of hot mud has been spread out from the earth since the burst first occurred in Porong, Sidoarjo at May 29th, 2006 until this day. This mud has covered the area for more than 717.027 ha with inundation that reaches many meters deep. If a close attention is being paid, 70% contain of the mud is water. Because of that, water volumes which have been produced is no less than 75 million m3.  Therefore, information of subsurface geological data of the region around the burst site is needed to find out where the source of water came from. This study is meant to get a subsurface image of Porong so that a subsurface water channel that supplies water to the centre of mud burst can be found. Geophysical data, which is in the form of gravity method, Audio Magnetotelluric (AMT), and Magnetotelluric are correlated with geochemical study of elements of the mud. Pb, Zn, Mn, Ag, Cd, Sb, Au, Se, and Hg elements which the hot mud have is  indication of hydrothermal influence at 100°C that come from the quarter volcanic system around the mud source such as Pananggungan Mountain and Arjuna Mountain.  Not only that, result of measurement, gravity interpretation in form of Bouger anomaly, AMT, and MT data show three lineament structures in NE – SW direction in Porong, Sidoarjo. One of them extends from Watukosek Village in Pananggungan Mountain to the mud lake of Sidoarjo. This lineament is interpreted as a fault zone with 0.2 – 0.7 km deep in Watukosek Village and even gets deeper in the mud lake area (1.5 – 3 km deep). The Fault is a permeable zone which acts as the subsurface water channel. This channel is interpreted as the way of water flow, so the mud burst still continuous until this day. 
Evidence of Pliocene-Pleistocene Unconformity in eastern Bogor Trough, Sumedang-West Java Syaiful Alam; Yoga Andriana Sendjadja; Lia Jurnaliah; Kurnia Arfiansyah Fachrudin; Reza Mohammad Ganjar Gani
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.v3i1.21528

Abstract

AbstractRecent measuring stratigraphic observation in Cikandung River has revealed the Late Pliocene stratigraphic and tectonic event. Research area is located in easter Bogor Trough. Previously, it was stated controversially pertaining to the stratigraphic relationship between Kaliwangu and Citalang Formations. The outcrop-based remark has never been explained, slightly intuitive. Making strike and dip measurements and stratigraphic analysis using tape and compass traverse were done to unveil the role of Plio-Pleistocene tectonic regime in stratigraphic-filling of the basin. Strike azimuths recorded from several locations of Citalang and Kaliwangu Formations show angular geometry and both of those sedimentary facies within formations indicate the significant and rapid change in depositional process. But interestingly, the angular geometry is only founded in the southern part of study area. To the north, angular relationship becomes parallel. This geometrical distribution implies the strong influence of tectonic regime in Late Pliocene interval. The evidence from outcrops observation conclude the unconformity between Citalang and Kaliwangu Formations. Keywords: Stratigraphic unconformity, Citalang and Kaliwangu Formations, Plio Pleistocene Tectonic
Tectonic Activity Response Based on Geomorphic Index In Pasirmunjul, Sukatani, Purwakarta Regency, West Java Alif Pradifta; Ismawan Ismawan; Aldrin Ramadian
Journal of Geological Sciences and Applied Geology Vol 6, No 1 (2022): 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.v6i1.45227

Abstract

The study area administratively located in Sukatani sub-district, Purwakarta Regency, West Java. This study is aim to determine the level of tectonic activity in the study area using a quantitative geomorphological approach. The geomorphic indices that used in this research are the Mountain Front Sinusity (SMF), Ratio of valley floor width to valley height (Vf), Hipsometric Integral (HI), Drainage Basin Shape (BS), and Asymmetry Factor (AF). Then, these parameters of geomorphic index, are included in the calculation of the Relative Tectonic Activity Index (IATR) which is show the distribution of tectonic activity levels in the study area. The results of the analysis Relative Tectonic Activity Index (IATR) show that the study area is divided into 3 classes of tectonic activity, namely class 2 (high), class 3 (medium), and class 4 (low). Class 2 occupies about 19.5% of the study area with an area of 7.6 km2 which is spread over the western part of the study area. Class 3 occupies about 79.8% of the study area with an area of 31.4 km2 which is spread dominantly in the study area. While class 4 (low), which occupies about 0.7% of the study area with an area of 0.28 km2 which is spread in the northern part of the research area. In general, the study area has a fairly balanced between level of tectonic activity with an erosion activity, but in the western part of the study area tended to be more dominated with tectonic activity than the erosion activity, which was indicated due to the influence of the structure in the area and caused a catastrophic ground motion in surrounding area.
PRELIMINARY SLOPE MAPPING IN CINTARATU VILLAGE, PANGANDARAN, WEST JAVA Bambang Hermanto; Pringgo Kusuma Dwi Noor Yadi Putra; Nur Khoirullah
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): 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.v4i1.29122

Abstract

The shape of a landscape is the result of geological processes in the past as well as human processes at this time. Slope mapping is one way of identifying hazards based on current landforms. Cintaratu Village area is an area that has a unique landscape condition because it has a lot of clastic limestone as a result of the karstification process millions of years ago and is currently experiencing significant developments in infrastructure development. This study aims to see the state of the slope around Cintaratu Village. This research uses a qualitative method that will be described as descriptively. Based on the results, several areas have very steep slopes form by clastic limestones and soils. The mean slope varies from 30° to 90° with a height of up to 30 m.
CHARACTERIZATION OF HYDROTHERMAL ALTERATION ZONES IN PANTI GEOTHERMAL FIELD, PASAMAN DISTRICT, WEST SUMATERA PROVINCE Wildani Supriadi; Agus Didit Haryanto; Johanes Hutabarat; Robertus S. L. Simarmata; Widya Asoka
Journal of Geological Sciences and Applied Geology Vol 2, No 6 (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.v2i6.20869

Abstract

anti geothermal area is located in Pasaman Regency, West Sumatra Province. The survey areais about 200 km away from the city of Padang and about 30 km away from the capital city ofPasaman Regency, Lubuk Sikaping. The purpose of this research activity was to determine thecharacteristics of hydrothermal alteration in an observed well. The method used was petrologicalanalysis on PNT-1 well core data from the depth of 41.5 m until 533.5 m, petrography analysis of17 rock samples, and Specterra analysis based on secondary data. The alteration minerals thatappeared in the observed well were calcite, sericite, chlorite, secondary quartz, anhydrite,opaque minerals, iron oxide, clay, and epidote minerals; with alteration types in the form ofreplacement and direct depositional. Two zones were sorted based on the presence of mineralsand determination of alteration zones, namely the Smectite-Chlorite zone, and the illit-smectitechloriteand sericite zone. The smectite-chlorite zone was located at thedepthof±41-±454mandwascharacterizedbythepresenceofsmectite,ilite-smectite,calcite,andchloritealterationminerals;whichweremoredominantthanotheralterationminerals.Thiszoneaccordingtothealterationzone division comprised of argillic zone with a temperature of 140° C - 220° C. Theilite-smectite-chlorite and sericite zone was located at the depth of ± 454- ± 533 mcharacterized by the presence of illit-smectite, chlorite, sericite, calcite and quartz minerals. Thiszone, according to the alteration zone division, was comprised of argillic zone with a temperatureof 200° C - 250° C. It was concluded that the alteration rocks in PNT-1 well were estimated toserve as caprock zone of the Geothermal Panti system which formed due to the interactionbetween rocks and acidic to neutral fluid in temperatures between 140° C - 250° C.
CARBONATE REEF OF THE KLAPANUNGGAL FORMATION IN THE BOGOR TROUGH, WEST JAVA . Abdurrokhim
Journal of Geological Sciences and Applied Geology Vol 2, No 1 (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.v2i1.13422

Abstract

AbstractThe Late Miocene shelf-margin carbonate reef is well exposed in the study area, and named as Klapanunggal Formation.  The formation is characterized mainly by thick and massive reefal limestone with large foraminifers and other types of shell fragments, such as mollusks and echinoderms, and it have been developed in a response to the decrease in sediment discharge superimposed by relative rise in sea level during the late Miocene. Keyword: carbonate, Klapanunggal Formation, rimmed reef, shelf margin, Bogor Trough

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