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2023 National Physics Seminar, SNF 2023

作者： Fatimah, F. Rizqi, A.F. Program Study of Geological Engineering Institut Teknologi Nasional Yogyakarta Yogyakarta Indonesia

The Nanggulan Formation is a formation unit consisting of sandstone, clay, and other sedimentary rocks. Lithological contact between clay and geologically old andesite could indicate an avalanche. The magnetic method in collecting data uses a natural magnetic source with a proton magnetometer. Acquisition data was determined according to the survey design, namely a grid with a distance of 250 meters per point. Data processing to remove noise data, namely noise from magnetic storms, position and altitude, and other natural disturbances. Later, Processing will produce a magnetic anomaly map, which must be separated between local and regional anomalies. This local anomaly will later form the basis for 2.5-dimensional modeling. This 2.5-dimensional modeling can get an overview of lithology, relationships between lithologies, and rock contacts according to the geological model in the field. The modeling results can describe the relationship between the claystone of the Nanggulan Formation and the igneous rocks of the Old Andesite Formation. Its relationship claystone is overlapping Andesite rocks in the Horgorejo Kulon Progo area. This can cause soil movement and landslides if the Andesite rocks experience massive weathering and erosion and if rainfall is high. © Published under licence by IOP Publishing Ltd.

关键词： Lithology

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TECTONIC GEOMORPHOLOGY ANALYSIS OF THE EAST LEMBANG FAULT SYSTEM IN THE UJUNG BERUNG AND JATINANGOR AREA, WEST JAVA, INDONESIA 44

TECTONIC GEOMORPHOLOGY ANALYSIS OF THE EAST LEMBANG FAULT SY...

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44th Asian Conference on Remote Sensing, ACRS 2023

作者： Sulastri, Murni Sadisun, Imam A. Sulaksana, Nana Sukrisyanti Rendra, Pradnya Paramarta Raditya Wahyuni, Sri Geological Technology Study Program Mining Energy Polytechnic Bandung Bandung Indonesia Indonesia Indonesia Faculty of Geological Engineering Universitas Padjadjaran Bandung Indonesia Bandung Indonesia

ISBN: (纸本)9781713893646

Lembang fault is an active fault that may trigger earthquakes and landslides in the North Bandung area. The movement of the fault is on the mainland, theLembang fult is still being debated even though an earthquake has been recorded which may have originated from this fault. The epicenter in the Cihideung area, in addition to tectonic influences, the activity of the Lembang fault is also thought to be influenced by volcanism which can affect the mechanism of fault movement. Tectonic processes play an essential role in the formation of the morphology of an area. The Lembang fault is a normal fault that was formed as a result of tectonic activity in the Neogene sge, located in the northern part of Bandung, stretching for 30 km in a west-east direction, the existence of this fault has shaped the morphology of the Lembang plains to the north and forms a hilly path trending west-east to the north. South. Tectonic geomorphology is the main factor that controls the development of landforms in active tectonic areas and have a significant influence on the natural features of mountains and watersheds which are located east of the Lembang fault, Cikapundung, and Cikeruh. Trending northwest-southeast geomorphic indication analysis is used to study tectonic activity in the study area in the form of basin shape (Bs), watersheds gradient index (SL), drainage basin asymmetry (Af), mountain face sinuosity (SMF) and valley floor width to valley height ratio (Vf). These geomorphic indication variables are combined to produce degrees of relative tectonic activity in the research area which can be divided into four classes;class 1 has a very high relative tectonic activity index, class 2 has a relatively high tectonic activity index, class 3 has a relatively moderate tectonic activity index, and class 4 has a relatively low tectonic activity index, field observation data in the form of the landform and geology of the research area support these results. © 2023 ACRS. All Rights Reserved.

关键词： Geomorphic Indication Lembang Fault Tectonic Geomorphology

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Indication of ore mineralization in Bora Area, Sigi Regency, Central Sulawesi 2

Indication of ore mineralization in Bora Area, Sigi Regency,...

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2nd International Seminar on Science and Technology 2020, ISST-2 2020

作者： Marliani Asrafil Geological Engineering Study Program Tadulako University Palu Indonesia

Bora area have a mineralization system associated with geothermal activity, characterized by the presence of veins in the rock. This study aims to determine the indication of ore mineral. The method that used in this research is geological field survey and mineragraphic analysis. The results showed that the vein texture in the study area was in the form of crustiform-colloform, moss, and zoned crystal textures. Mineragraphic analysis results show the mineral content of ore associated with veins in the rock including pyrite, chalcopyrite and covelite. This proves that indication ore mineral in bora area is associated with the veins formed in the rock. © Published under licence by IOP Publishing Ltd.

关键词： Pyrites

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Mechanical Properties of Cenozoic Organic-Rich Shale from North Sumatra and South Sumatra Basins, Indonesia

Mechanical Properties of Cenozoic Organic-Rich Shale from No...

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2024 International Petroleum Technology Conference, IPTC 2024

作者： Lanin, E.S. Sone, H. Sapiie, B. Musu, J.T. Widarsono, B. Hatta, M. Nugraha, A. Gunawan, B.K. Nugroho, D.A. Geological Engineering Study Program University of Wisconsin MadisonWI United States Geological Engineering Study Program Bandung Institute of Technology Indonesia Testing Center for Oil and Gas Research and Development Center for Oil and Gas Technology BBPMGB - LEMIGAS Jakarta Indonesia National Research and Innovation Agency BRIN Jakarta Indonesia Pertamina Hulu Energi Regional 1 Jakarta Indonesia Special Task Force for Upstream Oil and Gas Business Activities SKK MIGAS Jakarta Indonesia Directorate General of Oil and Gas Ditjen Migas - Ministry of Energy and Mineral Resources Jakarta Indonesia

ISBN: (纸本)9781959025184

Indonesia is actively studying its shale resources' potential to be developed. In contrast to other countries that have succeeded in developing their shale resources, Indonesian shale potentials are generally located at an active tectonic margin and are of younger ages (Cenozoic Era). This condition raises questions about the sustainability of its mechanical properties and development technique. Following our previous research, this paper presents the results of rock mechanical tests on shale from North Sumatra and South Sumatra Basins. The shale samples were prepared and tested by a rigorous multi-stage triaxial procedure. Eight (8) plugs representing the Baong and Belumai Formations of the North Sumatra Basin and eight (8) plugs representing the Talangakar and Gumai Formations of the South Sumatra Basin were prepared in vertical (V), horizontal (H), and 45° inclined (I) orientation relative to bedding. The test stages can be broadly categorized as the hydrostatic stage, triaxial stage, failure stage, and sliding-re-sliding stage. All the tests were conducted at a maximum confining pressure of 30 MPa to compare the results with results of our previous study and results from U.S. Shales. The tested shale plugs possess higher porosity than U.S. Shales for a given clay + organic matter (OM) content. Regarding rock strength, the analyzed plugs show a correlation with clay + OM content and inter-granular porosity. For the elastic properties, Young's modulus shows a decrease with clay+ OM contents, unlike the Poisson Ratio, which does not offer a clear trend. Meanwhile, creep compliance clearly shows the inverse trend of Young's modulus. The anisotropy of elastic properties is demonstrated by sample orientation, where the horizontal sample is the stiffest, the vertical sample is the softest, and the inclined sample is in between. Generally, the mechanical properties of the plug samples from Baong, Belumai, Talangakar, and Gumai Formations coming from two tertiary basins

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Geoelectrical Method for Detecting the Limit of Liquid Waste Flowing below the Surface at Piyungan Landfill 2

Geoelectrical Method for Detecting the Limit of Liquid Waste...

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2nd International Seminar on Science and Technology 2020, ISST-2 2020

作者： Jayadi, H. Muin, M.R. Sabhan Meidji, I.U. Geological Engineering Study Program University of Tadulako Indonesia Departement of Physics University of Tadulako Indonesia

Increasingly limited residential land in urban areas results in residents looking for and making settlements around landfills. This affects people's lives in fulfilling their daily needs, clean water. To meet the demand for clean water, some residents use well water as the primary drinking water source. Judging from the condition of the residential areas located in the landfill area, there may be an effect of waste, especially liquid waste, on well water sources. For this reason, research is carried out using the geoelectric method by combining two configurations, namely Schlumberger and dipole-dipole. So that it can provide an overview of the boundaries of liquid waste contaminants in the soil, which are associated with conductive fluids that affect the quality of clean water from residential areas around the landfill. In this study, it was found that the fluid flow associated with liquid waste has a lateral movement to the right with a depth of 24.5 meters. © Published under licence by IOP Publishing Ltd.

关键词： Land fill

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Urban geotourism development in the perspective of stakeholders

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International Journal of Geoheritage and Parks 2025年第1期13卷 102-116页

作者： Hadian, Mohamad Sapari Dwi Barkah, Mochmad Nursiyam Khadidjah, Ute Lies Siti Yuliawati, Ayu Krishna Aryanti, Asti Nur Suhardiman, Sani Geological Engineering Padjadjaran University Bandung 45363 Indonesia Communication Faculty Padjadjaran University Bandung 45363 Indonesia Economics and Business Education Faculty Indonesia University of Education Bandung 40154 Indonesia Management Study Program Universitas Indonesia Membangun Bandung 40266 Indonesia English Language Education Yogyakarta State University Sleman 55281 Indonesia Engineering Faculty Universitas Buana Perjuangan Karawang 41361 Indonesia

Geotourism is rapidly experiencing rapid growth in developing countries, such as Indonesia, and it is a component of sustainable tourism. In addition, the country has many areas of geodiversity in cities or towns that potentially can become urban geotourism destinations, such as the Bandung Basin area. This region is characterized by geological features, including young volcanic rocks surrounding the mountains, alluvial fans, and lake deposits at lower elevations extending from Rancaekek to the base of Mount Lagadar in the western part of the area. Therefore, this research aims to analyze the respective roles of stakeholders in urban geotourism development. The study used literature review and interview methodology, where data was interpreted with stakeholder analysis, and complemented by descriptive analysis. The results showed that stakeholders were divided into primary (quadrant 1), key (quadrant 2), and secondary (quadrant 3) categories, each with distinct interests and degree of influence. As urban tourism expands, it presents ongoing opportunities to cultivate sustainable practices within these locales. The establishment of urban geotourism necessitates the identification and evaluation of engaged stakeholders. The subsequent planning and management initiatives for the Bandung Basin area can be enhanced through the active participation of stakeholders. © 2025 Elsevier B.V.

关键词： Indonesia stakeholder analysis urban geotourism volcanoes

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Leaching of limonitic nickel from Sorowako with sulfuric acid at atmospheric pressure 2

Leaching of limonitic nickel from Sorowako with sulfuric aci...

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2nd International Seminar on Science and Technology 2020, ISST-2 2020

作者： Safitri, N. Mubarok, M.Z. Meidji, I.U. Hardi, J. Jayadi, H. Geological Engineering Study Program Tadulako University Indonesia Department of Metallurgical Engineering Institut Teknologi Bandung Indonesia Department of Chemistry Tadulako University Indonesia

Indonesia has the largest nickel laterite reserves in the world that it plays an important role in fulfilling the demand for stainless steel, nickel-based alloys, and the issue of using electric cars in the future. Currently, low-grade nickel laterite ore has not been maximally processed into value-added products domestically. The extraction process that is widely applied in the industry for low-grade laterite nickel ore through the hydrometallurgical route, which is the leaching method at atmospheric pressure in a sulphuric acid solution. The characterization of nickel ore from Sorowako has been studied that included water content analysis, sieve analysis, XRF analysis, XRD analysis, and leaching in sulphuric acid solution with agitation method at various leaching times. The results showed that the nickel ore sample from Sorowako had a water content of 5.51% with a dominant size fraction of -4 +14 mesh. XRD and XRF analysis results have shown that the chemical compositions of laterite nickel from Sorowako were Limonitic type of goethite (FeOOH) and quartz (SiO2) with the content of Ni, Co, Mg, and Fe of 1.5%, 0.02%, 0.05%, and 23.82%, respectively. The highest percentages of nickel and iron extract that were obtained at the 12 hour leaching time were 90.01% and 97.11%, respectively. © Published under licence by IOP Publishing Ltd.

关键词： Atmospheric pressure

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Landslide investigation through surface geological study and photogrammetry methods in Poi area, Sigi Regency Central Sulawesi

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AIP Conference Proceedings 2023年第1期2719卷

作者： Asrafil Asrafil Muhammad Fuad Afdal Mauludin Kurniawan Geological Engineering Study Program Tadulako University Palu 94118 Indonesia Geophysical Engineering Study Program Tadulako University Palu 94118 Indonesia

The earthquake that occurred on September 28, 2018 with a magnitude of 7.4 Mw at Central Sulawesi, caused damage to the extraordinary areas of Donggala, Palu, Sigi, and surrounding areas. The shock caused by the earthquake-triggered landslide in Poi Village, South Dolo District, Sigi Regency, with large dimensions on the hillsides and resulted in the formation of piles of material and closed the water flow to the west of the Poi Village settlement (geological Agency 2018). Investigations through surface geological studies and photogrammetry were carried out to identify surface geological conditions and potential landslide susceptibility in the study area. Based on the results of the geological review and analysis, it is known that the geology of the research area is composed of 3 rock units, namely the granite intrusion unit, the conglomerate unit, and the alluvial deposit unit. The photogrammetry results show that the structural activity acting on the study area is proven by the presence of two shear faults with opposite displacement directions. The landslide control factor in the study area lies in the structural conditions, slope, and geohydrological conditions as well as the level of weathering that occurs in rocks in the study area.

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geological hazards that occurred on September 28, 2018 in Sirenja sub-district Donggala Regency, Central Sulawesi Province, Indonesia

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AIP Conference Proceedings 2023年第1期2719卷

作者： Abdullah Abdullah Ahmad Imam Abdullah Fitrawati A. Marhum Ajeng Listianti Muslimin Umar Botjing Muhammad Rusli Muhammad Dahlan Th Musa Abdul Rahman I. Kadek Sulendra Sandra Sandra Geophysical Engineering Study Program Tadulako University Palu Indonesia Geological Engineering Study Program Tadulako University Palu Indonesia Physics Study Program Tadulako University Palu Indonesia Civil Engineering Study Program Tadulako University Palu Indonesia

The location of the Mw 7.5 earthquake on September 28, 2018, was in the Sirenja District of Donggala Regency or about 75 km to the north of Palu City. We present this paper to complete information on disaster data in the northern part, especially for the Sirenja area as an epicenter location. The scope of this research is to present the types of geological hazards, including the area coverage that influenced them. Starting with studying the geological conditions of the Sirenja area, then identifying and mapping the types of hazards that occur. Five types of geological hazards hit the Sirenja area at that time, namely due to surface rupture faults, earthquake shocks, liquefaction effects, tidal flood inundation, and tsunami. Thus, September 28, 2018, is a time that marks the Sirenja area is prone to several geological hazards, and at any time or without knowing when a natural disaster like this will occur again. Based on the results of this study, the local government and the people of Sirenja District are expected to immediately relocate and make a risk reduction strategy or action plan, where the information from this paper can contribute to this.

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Crystal size distribution (CSD) of plagioclase phenocryst-microphenocryst and the calculation of crystal resident times in the continuous central eruption sequences of Mount Lasem, Central Java, Indonesia 1

Crystal size distribution (CSD) of plagioclase phenocryst-mi...

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1st Workshop on Environmental Science, Society, and Technology, WESTECH 2018

作者： Nugroho, R.P. Disando, T. Kurniawan, I.A. Abdurrachman, M. Geological Engineering Study Program Universitas Pertamina Indonesia Petrology Laboratory Geological Engineering Study Program Institut Teknologi Bandung Indonesia

Mount Lasem is an extinct volcano in Central Java. Based on field work, five continuous central lava eruption sequences were identified. The rocks sampled from those lava units were classified as andesite which exhibit sign of magma mixing based on textural features from optical microscopy observation. With consideration of the importance of plagioclase in magma cooling reconstruction, a quantitative approach using crystal size distribution (CSD) of plagioclase phenocryst (long axis >=0.5 mm) and microphenocryst (long axis 0.1 - © Published under licence by IOP Publishing Ltd.

关键词： Volcanoes

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