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Bulletin of Geology
Published by Institut Teknologi Bandung
ISSN : 25800752     EISSN : 25800752     DOI : 10.5614/bull.geol.
Core Subject : Science, Engineering,
Earth & Planetary Sciences Energy Engineering
Bulletin of Geology is a research-based periodical scientific open access journal published by Faculty of Earth Sciences and Technology, Institut Teknologi Bandung (ITB). The published article in Bulletin of Geology covers all geoscience and technology fields including Geology, Geophysics, Geodesy, Meteorology, Oceanography, Petroleum, Mining, and Geography. The submitted abstract must be written in English and Bahasa Indonesia, but the article content is English or Bahasa Indonesia.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 10 Documents
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Search results for , issue "Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te" : 10 Documents clear
Linear Regression for Flooding Surface Identification in Well Log, and Outcrop Image Epo Prasetya Kusumah; Ridha Santika Riadi; Teguh Surino Setiawan
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

Defining parasequences manually would take a huge amount of time. Interpretation subjectivity has also become an issue among stratigrapher when they are dealing with parasequence boundary identification which may resulting in inconsistency of parasequence identification. This paper means to present the use of automation in parasequence boundary identification using simple linear regression method in synthetic data, well log data, as well as outcrop image data. In stratigraphy, vertical succession of lithology holds a very important meaning. Vertical succession of lithology in paralic setting where deposition occurred in a certain sea level might shows coarsening upward vertical succession. In the event where flooding occurred and sea level abruptly rise, the coarsening vertical succession might be disturbed by sharp change of lithology into finer particle, or simply called vertical discontinuity. Stratigaphers may use vertical discontinuity to identify the presence of flooding surfaces or parasequence boundaries. Linear regression can be used to identify vertical discontinuity by measuring error occurred due to linear regression prediction. Vertical succession that showing deposition continuity might show small error number in the data where vertical disturbance occurred. The error value might increase significantly. Thus, it would be possible to determine flooding surface using linear regression by applying some threshold. This method has been proven to work using both well log data and outcrop image data which might ease stratigraphy analysis workflow in general.
PALEOCURRENT STUDY OF NYALINDUNG FORMATION THROUGH MOLLUSCS PALEONTOLOGICAL ASPECTS IN CI GALASAR TRAVERSE SECTION, SUKABUMI, WEST JAVA Nisrina Bahiyah Kesuma
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Nyalindung Formation contains mollusc fossils in the Classes of Gastropoda and Bivalvia which can be used as environmental proxy for paleocurrent study, although this study has not been carried out in this rock unit. Located in Ci Galasar River, Nyalindung District, Sukabumi Regency, the research traverse section showed beds of mollusc fossils with several stratigraphic unit and locality fossils of Middle Miocene. Paleocurrent analysis was conducted in four location distributed in three different stratigraphic unit. Based on molluscs shells’ orientation, Nyalindung Formation in research area was deposited in different current direction. Measured in four locations, the current showed changes in the ancient currents from bimodal, complex, unimodal within direction N 291 ° -300 ° E, and unimodal in N 281 ° -290 ° E direction. These changes are combined with fossils association and later interpreted as changes in depositional environment setting. The bimodal current alongside the presence of Turritella terebra talahabensis and Cypraea sp. indicates litoral environment. Meanwhile, complex shells’ orientation with the presence of Gemmula (Gemmula) granosa woodwardii, Dientomochilus javanus, and Terebra talahabensis indicates litoral to neritic environment that is strongly affected by waves. The unimodal current in N 291 ° -300 ° E showing similar fossil association with complex current indicates similar environment setting, which is litoral to neritic, but with lower influenced of waves and more on faster unidirectional current. Lastly, N 281 ° -290 ° E current direction showed large bivalves fossil association such as Chione tjikoraiensis and Cavatodens jonkeri which indicates inner neritic environment influenced by unidirectional current. Based on tectonic setting in Middle Miocene, the unidirectional current affecting the deposition of Nyalindung Formation is suspected as long shore current.
LINEAMENT EXTRACTION AND THE CORRELATION TO VEGETATION AND MOISTURE INDICES FOR GROUNDWATER PREDICTION IN BENGKULU SELATAN REGENCY, INDONESIA Budhi Setiawan; FADHELLATUL KAMIL
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Lineament is an actual representation of the geological features in response to a weak zone that might manifest groundwater potential. The research aims to determine the relationship between the lineament extraction and vegetation and surface moisture indices. The study was conducted in Bengkulu Selatan Regency, Bengkulu, based on Shaded Relief images at azimuth 0o, 45o, 90o, and 135o from Digital Elevation Model (DEM) image processing through DEMNAS (8 meters). Then, analysis of vegetation and moisture indices using Normalized Difference Vegetation Index (NDVI), Normalized Difference Moisture Index (NDMI), and Moisture Stress Index (MSI) from Landsat 8 OLI/TIRS extraction image. The Pearson Linear correlation method is used for correlation analysis. Based on the analysis of the lineament data, there are 12,206 lineament patterns, dominantly trending in NW-SE, N-S, and NE-SW. The lineament density parameters show the density level 0 km/km2 -10.44 km/km2. The results of the correlation of data on lineament density to the image index have positive and negative trend values, namely: NDVI (0.16), NDMI (0.37), and MSI (-0.43). From the results, the highest density is straight to the vegetation and high surface moisture. Therefore, the analysis can be used as an initial indicator of the potential presence of groundwater
EFEK AKURASI DAN GEOMETRIK SISTEM TINGGI DIGITAL ELEVATION MODEL (DEM) TERHADAP PEMODELAN BAHAYA BANJIR ROB DI JAKARTA Firman Juliandri; Heri Andreas; Dhota Pradipta
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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The research aims to analyze the effect of DEM for accuracy and geometric height systems in regard with the results of tidal flood hazard modeling in Jakarta by comparing the modeling results from several DEM data that have different accuracy and by comparing the modeling results between global geoid datum and local datum refer to sea-level height. The high-accuracy DEM LiDAR model was used as a baseline to measure the accuracy between models. The DEMNAS-based model exhibits the result in the flooded area closest to the DEM LiDAR-based model with a ratio of 97%. The open-access Model i.e., DEM SRTM (30 m), DEM TanDEM-X (60 m), and DEM AW3D (30 m), shows a flooded area ratio about 5% - 48% with respect to DEM LiDAR-based model. The comparison between the model indicated a positive correlation between the vertical accuracy and spatial resolution of DEM with the accuracy of the tidal flood hazard model in Jakarta. Model using global geoid datum EGM2008 shows an inundated area less than 30% with respect to the inundated area from model using the Highest Astronomical Tide (HAT) tidal datum. The model validation shows the HAT tidal datum have optimum accuracy. Moreover, the HAT model provides a clear result that shows actual inundation points compared to other vertical datums. Furthermore, the comparisons between these models have been carried out to analyze the effect of model accuracy in regard to the results of the tidal flood risk assessment. The effect of low-accuracy DEM-based model exhibit the number of exposed populations about 2.2 – 54.0 and value of economic loss about 1.9 – 37.6 less times than the risk assessment using DEM LiDAR-based model.
LIQUEFACTION POTENTIAL ANALYSIS IN TRANS – SULAWESI RAILWAY, POLEWALI MANDAR-MAJENE SEGMENT USING CONE PENETRATION TEST METHOD Dzikra Zhafira; Imam Achmad Sadisun
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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rans-Sulawesi Railway is the first railway in Sulawesi. One of the segments that is passed by this railway is Polewali Mandar-Majene segment, West Sulawesi, which became the research area. The research area mostly contains of Quaternary sediments such as alluvial. Liquefaction may occur because of earthquake that causes loss of strength within soils. Most of the cases, liquefaction occur in Quaternary sediments that are decomposed, loose, and unconsolidated. So, liquefaction analysis is needed on the research area to determine the liquefaction potential that might happen there. Liquefaction potential analysis was carried out using cone penetration test method (CPT). The analysis conducted is liquefaction trigger analysis. The analysis was carried out by calculating liquefaction safety factor (FSL) and liquefaction potential index (LPI) at 14 CPT sites with varying depth from 3,8 meters – 14 meters. Based on the analysis, the liquefaction safety factor (FSL) value obtained shown that the 14 CPT sites has a potential for liquefaction with Mw 7,5 earthquake because the FSL values are less than 1. Based on the calculation of liquefaction potential index (LPI), the research area is in the high – highest category.
SUBMARINE LANDSLIDE IDENTIFICATION IN THE SOUTH OF LOMBOK STRAIT AND ITS HYPOTHETICAL GENERATED TSUNAMI: A PRELIMINARY STUDY Rizqi Valentra
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Based on the bathymetry map of Lombok Strait, the seabed morphology in the south of Lombok Strait was primarily a submarine canyon where the depth profile change drastically from 400 m to 2000 m. In a closer look, there was one part of the canyon that has crowning scar with mounded sediment just below it. This feature was interpreted as a landslide deposit and it was discovered in the south part of Lombok Strait, around 24 km from the south-west of Nusa Penida, and 30 km from the center of Benoa Bay. The scar was found around depth 950 m. According to the area of the scar, the estimated volume of lost surface area was illustrated around the volume of Anak Krakatau landslide that generated tsunami in 2018. By assuming this landslide was also tsunamigenic, it will impact the coastal area that surrounding the sea which are the south of Bali Island and the south of Nusa Penida Island. In this preliminary study, a tsunami numerical model – COMCOT which adopts linear and non-linear Shallow Water Equation will be utilized to investigate the characteristics of the landslide-induced tsunami on the surrounding coastal area of south of Bali Island and the south of Nusa Penida Island.
The Evaluation of Prefabricated Vertical Drain as the increasing of Consolidation Process in Residual Soil of Talanggulo Sanitary Landfill, Jambi Muhammad Zelandi
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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The consolidation process in the residual soil layer that has not yet reached primary consolidation equilibrium (pore pressure 1 kN/m2) could increase its potential to have land subsidence. It is necessary to deal its problem with hustling the consolidation process of the soil layer, so the soil consolidation equilibrium states can be achieved, and the soil will withstand the load from the overburden on it. The sanitary landfill in Talanggulo, Jambi, resides on residual soil with a lithological condition dominated by clay, which the consolidation process occurs longer. Thus, it needs to accelerate the settlement of the soil that can be used as the base for landfill. The method used in this study are analytical method and the finite element method, which is looking at vertical settlement of the soil and decreased of pore water pressure (PWP) in sanitary landfill conditions without PVD, and with PVD at the spacing of 1.5 m, 2 m and 3 m, at the residual soil layer. Based on the measurement results when the disposal thickness at 15 m, it is observed that in landfill conditions without PVD, the vertical change that occurs is 1.75 m, while in landfill conditions with PVD 3 m spacing noted as 2.02 m, and at landfills with PVD 2 m spacing it occurs the vertical change of 2.12 m. Meanwhile the PWP process. the velocity of landfills with PVD to reaches the minimum pore pressure faster than landfills without PVD, with PVD 2 m spacing has the greater effect than PVD with 3 m spacing. It can be identify the PVD usage in Talanggulo sanitary landfill could be effective to accelerate the settlement process.
IDENTIFICATION AND ANALYSIS OF LANDSLIDE SOIL VULNERABILITY AS THE BASIS OF DISASTER MITIGATION WITH GEODETIC MEASUREMENT METHODS AND QUANTITATIVE DESCRIPTION Dinda Pratiwi Dwi Putri; Ediyanto -; Riyas Syamsul Arif; Jessica Astrid Kartika; Cahya Riski Fathurohman; Dessy Apriyanti
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Karanganyar Regency is one of the regencies/cities in Central Java Province, most located around Mount Lawu. The rock structure is sedimentary or has not been lithified. Based on these geological conditions, the area around Mount Lawu is vulnerable to hydrometeorological disasters such as landslides supported by several factors other than soil conditions, namely high rainfall, slopes, overburdening plants, or symptoms of geological structures. One of the villages affected by the hydrometeorological disaster was Jambon Village, Jenawi District, Karanganyar Regency. The natural disaster that hit Jambon Hamlet in 2014 caused soil cracks and damage to houses. As a form of disaster analysis and mitigation, this study assessed landslide susceptibility through deformation parameters using a GNSS (Global Satellite Positioning System) measuring instrument to determine the magnitude and direction of landslide movement. The deformation analysis results based on the GNSS measuring instrument show that the measurement results still meet the threshold, or there is no deformation of the soil structure at the 7 sample points measured. This caused an anomaly because the landslide happens conditions were very severe except for one area, including one church and 13 houses. Therefore, it is necessary to study further to prove the cause of landslides through other parameters such as geological structure symptoms and time. The results of this study are expected to provide recommendations for safe areas around landslides to be maintained or not.
Multi-Sensor Data Acquisition at Bukit Pawon (West Java) to Support Sustainable Conservation of Cultural Heritage Gusti Ayu Jessy Kartini
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Currently, the survey and mapping technologies for data acquisition are rapidly developing. One can obtain thousands to millions of points in a single measurement using a variety of sensors. Additionally, this rapid development also applies to image-based data acquisition. The development of these technologies is very beneficial for various purposes, one of which is the cultural heritage conservation. This study aims to describe the data acquisition using multi-sensors to support the conservation of cultural heritage at Bukit Pawon West Java. This study was conducted in the Bukit Pawon, West Java, and the laser-based and image-based geospatial data were utilized, e.g., Terrestrial Laser Scanner (TLS), Handheld Laser Scanner (HLS), UAV (Unmanned Aerial Vehicle) photogrammetry, and Airborne Laser Scanner (LiDAR) to obtain point clouds representing the Earth’s surface of the interest area along with their corresponding true colors and intensities. The combination of TLS and HLS technologies is complimentary, providing a complete image for subsequent analysis. Combining these multi-sensors will be beneficial for geospatial analysis and support cultural heritage conservation at Bukit Pawon, West Java. In the future study, a multi-sensor data integration algorithm will be created and will be used to detect geological fractures and classify cave materials using a deep learning approach.
SAFETY FACTOR ANALYSIS(SF) SAFETY FACTOR ANALYSIS (SF) OF SEDAYU MOUNTAINOUS AREA USING LIMIT EQUILIBRIUM METHOD 2D Arif Setio Wibowo
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Landslides and floods that occur in Sedayu Village are disasters that often occur. Both disasters were strongly influenced by rainwater. The area of ​​flow and distribution of surface water is poor resulting in flooding at the location which causes frequent landslides on the slopes. To express the stability value of a slope, a term is known as the value of the safety factor, which is the result of the comparison between the magnitude of the resisting force and the driving force of the avalanche. Slope stability analysis determines the safety factor of the landslide field. The safety factor value for safe soil or rock slopes is in the FK 1.25 – 1.5 according to SNI 8460 2017. This study aims to estimate the slope safety factor around the Mount Sedayu area using the 2-dimensional boundary equilibrium method. The boundary equilibrium method is a very popular method and is often used in slope stability analysis for translational and rotational slip types. The condition of slope stability in the boundary equilibrium method is expressed in the value of the factor of safety. Slope stability analysis is generally carried out using the 2-Dimensional Boundary Equilibrium Method because it is simpler. In the 2D slope stability analysis, the landslide that occurs is assumed to have an unlimited or continuous length. This method uses the principle of balance of forces. The concept of this method is to calculate the ratio between thrust and resistance forces based on the assumption of a potential landslide area and divide the slope into several slices. This method is useful for calculating the safety factor on slopes. From the results of a 2-dimensional slope stability analysis in the Sedayu Mountains area, the safety factor value is 0.91 and it can be concluded that the slope is considered unstable where the value of the FK factor of safety < 1. The smaller value a safety factor, slope is considered to be disturbed or unstable.

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