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

作者： Meidji, I.U. Rusydi, M. Asrafil Jayadi, H. Safitri, N. Geology Engineering Study Program Tadulako University Indonesia

A soil's dynamic characteristics greatly influence earthquake potential damage inland. Subsurface investigations to determine the dynamic characteristics of the soil can minimize the risk of such damage. The sediment layer thickness is one of the parameters to assess the local geological character in response to an earthquake. Another parameter is Vs30 value, which is used to classify soil types as an indicator of soil response, which generally dominates ground motion amplification. In this study, the two parameters are analyzed to determine the potential for local damage in the event of an earthquake in the eastern area of Mataram City using the rayleigh wave inversion from microtremor data. The research area covers 3 districts, including Selaparang, Cakranegara, and Sandubaya Districts. The results showed that the value of the sediment thickness in the entire study area ranged from 12.78 m to 57.20 m. The value of Vs30 varies between 286 m/s to 866 m/s with the classification of rigid soils, very dense soils, and soft rocks and rocks. These results indicate that the study area in general experiences a large potential for damage if an earthquake occurs. This research is expected to be a reference for the spatial plan of Mataram City. © Published under licence by IOP Publishing Ltd.

关键词： Soils

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Identification of potential liquefaction in Kabonena 2

Identification of potential liquefaction in Kabonena

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

作者： Badaruddin Abdullah Priambudi, M.D. Rusli, M. Labania, H.M.D. Rugayya, S. Asrafil Geophysics Engineering Study Program Tadulako University Indonesia Physics Study Program Tadulako University Indonesia Geology Study Program Tadulako University Indonesia

The research was conducted in Kabonena village, which aims to see the subsurface structure and the liquefaction potential. The research was conducted using the geoelectric resistivity method with the Wenner system. The parameters used are geological data, hydrogeology and formation values to obtain between the resistivity value and the lithology of the study area. Furthermore, by considering the geological, hydrogeological conditions and formation factor values, the specific resistance values for each layer are interpreted. The results obtained show that the layers with specific resistance values of 39.16 - 97.9 Ωm are dominated by water-saturated sand/gravel. The resistivity value above 97.9 - 200 Ωm is the layer of molasses and alluvium deposits/coastal deposits, and the resistance value above 200 Ωm is the layer of crushed granite and granodiorite. The existence of a subsurface structure like this, so that in Kelurahan Kabonena it is called a liquefaction event. The location has a layer of saturated air that points to the east with a depth of less than 24 meters. © Published under licence by IOP Publishing Ltd.

关键词： Hydrogeology

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A morphometric analysis for investigation climate impact on settlement in Lengkiti, Ogan Komering Ulu Regency, Indonesia 5

A morphometric analysis for investigation climate impact on ...

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5th International Conference on Climate Change 2020, ICCC 2020

作者： Setiawan, B. Pamuji, Y.P. Jati, S.N. Hastuti, E.W. Geology Engineering Study Program University of Sriwijaya Jl. Srijaya Negara Bukit Besar Palembang Indonesia

The change in morphological patterns upstream of Ogan River were investigated to analyze land-use and climate change impact on the river meandering. This study aimed to investigate morphological changes of Ogan River in Lengkiti area between 1996 and 2019. Two sets of Landsat areal (1990 and 2016) were used to identify the morphological changes during flood periods. Data analysis used the maximum likelihood approach, t-test and Spearman correlation analysis. The morphometric indicators such as river width (W), meander neck length (L), axis length (A), curvature radius (R), water flow and sinuosity of meander (C) were extracted to identify the morphological pattern of river meandering. Analysis of land-use change used Support Vector Machine (SVM) and kernel function method to interpret the meander parameter change. Ogan River in Lengkiti, such as Batu Kuning and Marga Jaya segments, which have rice field and settlement cover from 1996 to 2019, had been cut off. Cut-off occurred due to landslides that entered river's body and narrowed riverbed. This fasted river flow even though river discharge was same, caused intensive erosion and sedimentation. The increase in water velocity increased flow power, shortened flow distance and cut-off caused reduced meander's sinuosity (C). © Published under licence by IOP Publishing Ltd.

关键词： Rivers

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History Woyla Arc of the Garba Complex: Implications for Tectonic Evolution of the South Sumatra Region, Indonesia

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Journal of Geoscience and Environment Protection 2021年第12期9卷 118-132页

作者： Idarwati Heru Sigit Purwanto Edy Sutriyono Carolus Prasetyadi Stevanus Nalendra Jati Geology Study Program Faculty of Engineering University of Sriwijaya Indralaya Indonesia Department of Geology Faculty of Mineral Technology University of Pembangunan Nasional “Veteran” Yogyakarta Indonesia

Studies on outcrop-scale structures have been conducted at the Garba complex. This study aims to add the high-resolution of the South Sumatra region to reconstruct the structural geology and implications of tectonics for the region. The study area is commonly referred to as crystalline basement highs forming the southwestern boundary of the Paleogene South Sumatra basin. The structures commonly show the NW-SE, NNW-SSE, and ENE-WSW trends. The methodology used includes field mapping, analysis of Digital Elevation Model (DEM), petrography, and X-ray fluorescence (XRF). The major fractures include wrench slip, reverse, and normal faults, while the observable microstructures comprise pull-apart calcite veins, shear joints, boudins, parasitic folds, and the augens. The earlier structuring episode was probably related to crustal extension, perhaps associated with the Paleogene rifting that occurred along the western margin of Sundaland. In the Late Neogene, tectonic compression took place in the entire region, allowing inversion of the Pre-Tertiary sequence. As compression waned in the Pleistocene, extension commenced, and a number of the ENE-WSW tensional block faulting developed and intersected the older NNW-SSE alignments. It is important to note that the latest tectonic event in conjunction with deep erosional denudation had likely exhumed the terrain and eventually shaped the present-day fractured and rough landforms in the study area.

关键词： Basement High Crystalline Sequence Structure Tectonics

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Characteristics of primary tin mineralization in the Central and West Bangka Island 3

Characteristics of primary tin mineralization in the Central...

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3rd Life and Environmental Sciences Academics Forum, LEAF 2019

作者： Aditya, R. Setiawan, I. Nugraheni, R.D. Sihombing, F.M.H. Indra, T.L. Universitas Indonesia Depok16424 Indonesia Bandung40135 Indonesia Geology Engineering Study Program Faculty of Earth and Energy Technology Universitas Trisakti Jakarta Barat11440 Indonesia

Bangka Island is an important tin producer in Indonesia, mostly from the secondary tin deposits. However, the secondary tin deposit is depleting, causing further exploration shifted to the primary tin mineral. The purpose of this study is to make a mineralization model of primary tin deposit in Bangka Island. Methods that implemented in this study are petrographic analysis, mineragraphic analysis, XRD (X-Ray Diffraction), and XRF (X-Ray Fluorescence) analysis. The studied rock samples that consisted of granite, meta-sandstone, and sandstone. Some of the rocks are altered rocks with varying intensity. Petrographic and mineragraphic analysis show the presence of minerals that indicate the primary tin deposits, such as cassiterite, tourmaline, topaz, sericite, pyrite, and sphalerite. XRF analysis shows data about the value of Sn elements so that they can be classified into two classes, very high grade (> 800 ppm), and low grade (100-200 ppm). XRD analysis is necessary to do to determine the type and intensity of alterations that occur in the study area. The results of each analysis will provide supporting information regarding the primary tin mineralization process in Bangka Island. © Published under licence by IOP Publishing Ltd.

关键词： Pyrites

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Fracture Zone Analysis Based on Property Electrical Borehole Image Log and Geomechanic Geothermal Field Solok, West Sumatra 1

Fracture Zone Analysis Based on Property Electrical Borehole...

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

作者： Agustin, Friska Abdullah, Chalid Idham Palabiran, Merandy Sulastri, Asti Geology Engineering Study Program Faculty of Earth Sciences and Technology ITB Indonesia Mechanical Engineering Study Program Faculty of Mechanical and Aerospace Engineering ITB Indonesia Indonesia

Prospective area of Solok geothermal lies in step over transtensional between two segments, Suliti and Siulak, Sumatra faults. Geological structure in this prospect area shows structural pattern controlled by "oblique divergent strike-slip fault system" (releasing bend) as a proceed of embraced movement from Sumatra fault and establishes "dilation zone" between those two segments, forming negative flower structure in direction of NW-SE and N-S. The pattern of geological structure is predicted to control the availability of solok geothermal system which in this case related to presence of surface manifestation. The pattern of geological structure is predicted to control the availability of solok geothermal system which in this case related to presence of surface manifestation. Surface manifestation indicates good permeability zone that can be used as flow path of geothermal fluid from reservoir. © Published under licence by IOP Publishing Ltd.

关键词： Geothermal fields

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Sediment thickness mapping and soil classification using ellipticity inversion of Rayleigh wave in the eastern part of Mataram City, Indonesia

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Journal of Physics: Conference Series 2021年第1期1763卷

作者： I U Meidji M Rusydi Asrafil H Jayadi N Safitri Geology Engineering Study Program Tadulako University Indonesia Geophysical Engineering Study Program Tadulako University Indonesia

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Identification of potential liquefaction in Kabonena

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Journal of Physics: Conference Series 2021年第1期1763卷

作者： Badaruddin Abdullah M D Priambudi M Rusli H M D Labania S Rugayya Asrafil Geophysics Engineering Study Program Tadulako University Indonesia Physics Study Program Tadulako University Indonesia Geology Study Program Tadulako University Indonesia

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Single microtremor method for estimating site fundamental frequency at a site in the historical city of Byblos-Lebanon 8

Single microtremor method for estimating site fundamental fr...

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8th Annual International Conference 2018 on Science and engineering, AIC-SE 2018

作者： Tumur-Uyal, N. Setiawan, B. Oucherif, M.S. Department of Geology and Geophysics National University of Mongolia Mongolia Mongolia Program Study of Geological Engineering Faculty of Engineering Syiah Kuala University Indonesia Geoexplo Cheraga Algiers Algeria

A single ambient noise measurement has been found to be useful in investigating the near-surface geology in particularly for estimating site fundamental frequency. This single microtremor method is very attractive and has been successfully applied in many projects as the method is non-destructive, low cost, feasible for urban environments, fast, and deep penetration. Furthermore, this single microtremor method has been successfully applied in many projects. This paper presents the application of the single microtremor method to estimate the site fundamental frequency at a site in the historical city of Byblos, Lebanon. Pre-processing of industrial origin detection was carried out. Several durations of the measurements were investigated to obtain the most stable results. The site fundamental frequency was validated using one-dimensional site response analysis. The results are presented in this paper. © Published under licence by IOP Publishing Ltd.

关键词： Deep penetration

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A morphometric analysis for investigation climate impact on settlement in Lengkiti, Ogan Komering Ulu Regency, Indonesia

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IOP Conference Series: Earth and Environmental Science 2021年第1期724卷

作者： B Setiawan Y P Pamuji S N Jati E W Hastuti Geology Engineering Study Program University of Sriwijaya Jl. Srijaya Negara Bukit Besar Palembang Indonesia Former Student Geology Engineering Study Program University of Sriwijaya Jl. Srijaya Negara Bukit Besar Palembang Indonesia

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