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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 7 Documents
 1 
Search results for , issue "Vol 3, No 3 (2019): Journal of Geological Sciences and Applied Geology" : 7 Documents clear
FLOOD POTENTIAL IN THE DOWNSTREAM OF CITARUM RIVER, MUARA GEMBONG, BEKASI DISTRICT, WEST JAVA Aton Patonah; Endah Tresnasari; edi tri haryanto; pradnya p. raditya rendra; zulfa sabily; emi sukiyah; murni sulastri; Muhammad jihad abdurrohman; alvindo andreansyah putera; Agam Subagja; panji ridwan
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.v3i3.26013

Abstract

The flood can affect an area so cause great loss. Muaragembong is one of the sub-districts in Bekasi Regency. This area is known as an area that is regularly hit by floods. The purpose of this study is to analyze changes in flood areas, specifically those related to residential areas. The results showed significant changes in the flood area from 1993 to 2016. Increased changes in land use from swampy areas and mangrove forests to residential areas are thought to be the cause of the increase in flooding every year. One way to reduce the impact of flooding in Muaragembong is to restore the existence of mangrove forests along the Citarum River to the sea.Keywords: Flood, Muara Gembong, Citarum River, Land Use
Petrogenesis of Andesite in Bukitcula, Baleendah District, Southern Bandung, West Java Nouval Muamar Asrial; Mega Fatimah Rosana; Kurnia Arfiansyah Fachrudin; Nazihah Nordin
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.v3i3.23851

Abstract

Administratively, Bukitcula Lava located in the area of Baleendah, Southern Bandung, West Java . Geographically located at Longitude 107o36'00" to 107o39'00" and Latitude 7o00'00" to 7o02'42". Baleendah Lava Complex consisted of steeply hill composed by andesite. Petrology, petrography and geochemical studies (XRF analysis) were used to understand the detail of rock characteristics. Petrological analysis studies shows mineral abundances of feldspar, amphiboles, pyroxenes and opaque mineral. Petrographical analysis show abundances of plagioclase, pyroxene, hornblende, and groundmass composed by plagioclase microlites, volcanic glass, and opaque mineral. Texture found in petrography analysis shows glomeroporphyritic, sieve, pyroxene penetration twin, zoning, and trachytic. Based on geochemical analysis, Bukitcula Lava composed by basaltic andesite and andesite according to TAS diagram. The magmatic series of rocks is Calc-Alkali and Tholeiitic series, with High-K and Medium-K (Calc-Alkaline Series) magma group. Magma interract with continental crust, with tectonical setting related on Island Arc Calc-Alkaline Basalt, and origin of magma ranged ranged from ± 139 km - ± 148 km in the Benioff zone. We conclude that the forming of Baleendah Lava Complex was influenced by fractional crystalization and slightly magma mixing.
DISTRIBUTION PATTERN DIFFERENCES OF KALIWANGU FORMATION IN UJUNGJAYA AND PASIR MALATI, SUMEDANG, WEST JAVA Nisa Nurul Ilmi; Iyan Haryanto; Abdurrokhim Abdurrokhim; Billy Gumelar Adhiperdhana; Faisal Helmi; Johanes Hutabarat; Edy Sunardi
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.v3i3.26225

Abstract

The distribution of Kaliwangu Formation sediment in West Java generally follows the structure of Java fold thrust belt, which directed west-east. The Java fold thurst belt was efectively formed during Pleio-Pleistocene tectonics events, in which all of the Cenozoic sediment were deformed by compression stress in north-south direction. In Ujungjaya area, Kaliwangu Formation has northwest-southeast direction, while in Pasir Malati, the formation was arced relatively in north-south direction. Kaliwangu Formation distribution in Ujungjaya was influenced by the massive compression tectonics occurred in Java. This tectonic event were occurred during Pleio-Pleistocene which resulted in Java thrust fold structure pattern including Baribis Faults. Unlike in Ujungjaya, the distribution of Kaliwangu Formation in Pasir Malati was arced in north-south direction which caused by its fold structure. There is no indication of regional fault in Pasir Malati area although a lot of fault structure was found as a part of regional structure.
SLOPE STABILITY ANALYSIS USING FINITE ELEMENT METHOD (FEM) IN WARA OPEN PIT COAL MINE, PT ADARO INDONESIA, TABALONG, SOUTH KALIMANTAN Josua Washington Sihotang; Taufiq Bakhtiar; Nur Khoirullah; Raden Irvan Sophian; 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.v3i3.25667

Abstract

The stability of slope is impacted by Rock Mass Rating, material properties, and slope geometry. Furthermore, the slope stability analysis was needed to know the slope stability condition. This research aims to know the Strength Reduction Factor (SRF) value by using Finite Element Method (FEM) using Hu=1 and Hu=Auto. The geotechnical mapping that is Rock Mass Rating (RMR) and Measured Section were done to get the Geological Strength Index (GSI) and profile of layer rocks in highwall slope SCT_J1 and SCT_J2. From the FEM analysis, actual slope SCT_J1 has the SRF=1.25 with Hu=1 and SRF=1.4 with Hu=Auto. SCT_J2 has SRF=1.21 with Hu=1 and SRF=1.3 with Hu=Auto. From the slope stability analysis, SCT_J1 and SCT_J2 were classified into stable slope due to the SRF value higher than 1.2.
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.
GEOLOGY OF BUAHDUA AREA, SUMEDANG DISTRICT, WEST JAVA PROVINCE Pradnya Paramarta Raditya Rendra; Nana Sulaksana
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.v3i3.25731

Abstract

Buahdua area is located in Sumedang District, West Java Province with coordinate 107°53’52,30” E - 107°59’18,83” E and 6°44’2,15” S - 6°38’38,39” S.  This research aims to identify and characterize the geology of Buahdua area and its surrounding. This research used field observation, studio, and laboratory analysis method. Digital maps used to carried out processing step in studio and field tools such as geological hammer, camera, GPS, and compass used to carried out field observation. Rock samples are taken for laboratory analysis. Based on field observation, studio, and laboratory analysis, the research area can be divided into four morphology unit namely very gentle sloping hill, gentle sloping hill, rather steep hill, and steep hill morphology unit. Also, the research area has four drainage patterns namely anastomotic, subdendritic, subparalel, and subrectangular drainage pattern. The lithostratigraphic units in the research are can be divided into three units namely claystone (Tmbl), sandstone (Tmbpl), and volcanic breccia (Kbv) unit, and alluvium (Kal). The geological structures developed in the research area are shear joint and oblique fault (Cikandung and Kamal oblique fault). Geological history of the research area was started from middle Miocene (N9) when claystone unit was deposited in deep marine environment. In middle Miocene (N9 - N10), sandstone unit was deposited in deep marine environment. After those rock unit, there was tectonic activity in Pliocene - Plistocene caused geological structures, shear joint and oblique fault. Occurences volcanic activity after tectonic activity caused volcanic breccia unit was deposited. After those process, alluvium was deposited in Cikandung River until now.
STRUCTURAL GEOLOGY AND MAGMATISM/VOLCANISM ACTIVITY TOWARD GEOMORPHOLOGY IN BANDUNG BARAT-CIRANJANG, WEST JAVA Iyan Haryanto; Nisa Nurul Ilmi; Johanes Hutabarat; Nanda Natasia; Edy Sunardi
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.v3i3.25947

Abstract

Geomorphology along Ciranjang to Bandung Barat is dominated by structural hills while others are related to the magmatism/ volcanism activity. The others morphological features are plain land which belong to Ciranjang and Bandung depression. In interpreting geological structures, topography map and DEM were used together with field data particularly the landscape faulting indication and flow pattern. The compiled data of morphology, stratigraphy and landscape in the study area showed that the geomorphology of the area could be differ into several unit which are structural hill, non-structural hill, and plain morphology units. Sedimentary structural hill unit were develop in Rajamandala hills starting from the Cianjur-Bandung border, Solitary hills geomorphological unit developed in Cililin area, and the developed plain unit developed in Ciranjang and Cililin area

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