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Muh. Altin Massinai
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Departemen Geofisika, Fakultas Matematika dan Ilmu Pengetahuan Alam - Universitas Hasanuddin, Gedung MIPA, Kampus Unhas Tamalanrea - Jalan Perintis Kemerdekaan, Makassar - Sulawesi Selatan 90245
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Jurnal Geocelebes
Published by Universitas Hasanuddin
ISSN : 25795821     EISSN : 25795546     DOI : https://doi.org/10.20956/geocelebes.vxix.xxxxx
Core Subject : Science,
Earth & Planetary Sciences
Jurnal Geocelebes adalah jurnal peer-review yang dipublikasikan oleh Departemen Geofisika Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Hasanuddin. Jurnal ini terbit dua kali dalam setahun pada bulan April dan Oktober. Jurnal ini diperuntukkan sebagai sarana publikasi ilmiah di bidang geofisika baik teoritik maupun terapan. Artikel yang dimuat merupakan hasil penelitian yang orisinal, tinjauan (review) tentang kemajuan terkini dari suatu topik tertentu, studi kasus aplikasi geofisika atau pun resensi tentang perangkat lunak yang berkaitan dengan geofisika. Fokus dan cakupan topik yang dimuat dalam Jurnal Geocelebes: Geofisika eksplorasi Seismologi Vulkanologi Geofisika lingkungan Hidrometeorologi Oseanografi Dinamika pantai dan lautan Geoinformatika Mitigasi bencana geologi
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geofisika
Articles 137 Documents
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Identification of Mount Sirung Geothermal Potential based on Land Surface Temperature and 3D Gravity Model Ayu Alvita Primastika; Dhika Faiz Fadrian; Fardhan Rafshan Zani; Nanda Ridki Permana
JURNAL GEOCELEBES Vol. 7 No. 2: October 2023
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v7i2.23759

Abstract

According to the Ministry of Energy and Mineral Resources 2021 data, first ranks in the list of 10 provinces with the lowest electrification ratio in Indonesia. One of the geothermal prospect areas in East Nusa Tenggara is Mount Sirung. This research was conducted in August 2022 which aims to identify geothermal systems. Gravity data was obtained from the GGMPlus 2013 with a total of 3819 data. Land Surface Temperature (LST) is used as supporting data with a surface temperature approximately 26.1 – 29.5°C because there are manifestations of hot springs at Mount Sirung. Based on the derivative analysis, there are four trajectories in the northwest-southeast direction with reverse faults and normal faults as the geothermal control system of Mount Sirung. The results of 3D gravitational inversion modeling are estimated that there is clay interspersed with breccia with a density of 2.34 – 2.39 g/cm3 as clay cap at 0 – 600 m, and lava interspersed with sandy tuff as a reservoir with a density of 1.98 – 2.03 g/cm3 at 700 – 1400 m. Based on these results and discussions, Mount Sirung is proven to have geothermal potential which can be utilized as a source of electrification in East Nusa Tenggara.
2D Marine Seismic data Analysis Using Comparison of Kirchhoff’s Migration Method and Finite Difference Method (Case Study: Nias Basin, North Sumatera) Annisa, Cindy Fatika Nur; Muliadi, Muliadi; Ivansyah, Okto; Subarsyah, Subarsyah
JURNAL GEOCELEBES Vol. 8 No. 1: April 2024
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v8i1.24638

Abstract

Seismic migration is one of the important stages in seismic data processing which aims to map seismic events to their actual positions. The migration process used in this study is post-stack time migration in the time domain using the Kirchhoff migration technique and the finite difference method to determine the results of subsurface imaging from the two migration techniques and then compare them to determine the accuracy of selecting the appropriate migration for the L08 basin trajectory research area. Nias basin, North Sumatra. The processing steps are carried out according to the preprocessing to processing stages in the Promax 5000 software. Based on the results of the study, the optimum use of aperture migration in Kirchhoff migration will produce good subsurface cross-sectional imaging. The aperture value used is 3000 ms. In the finite difference migration, subsurface imaging is much more focused with a time step variation of 10 ms, whose function is to focus the hyperbolic diffraction energy on the migration data.
Potential of Limestone as a Groundwater Reservoir based on Porosity Analysis in the Tintingon Area, Banggai District Nurhikmah Supardi; Syarifullah Bundang; Meltini Pakiding
JURNAL GEOCELEBES Vol. 7 No. 2: October 2023
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v7i2.25258

Abstract

The research area is in Tintingon Village, Banggai Regency, Central Sulawesi Province. This study aims to determine the quality of limestone as a groundwater reservoir based on porosity analysis. This study begins with sampling limestone at seven stations, then selecting fresh samples for laboratory analysis. Laboratory analysis consists of two, namely petrographic analysis and porosity analysis. The petrographic analysis aims to determine the microscopic naming of limestone and the type of pores in the rock. Porosity analysis aims to test the ability of limestone to accommodate fluids as a groundwater reservoir. Based on the petrographic analysis, it is known that the microscopic naming of limestone in the study area is wackestone and packstone. The types of limestone porosity are vug, intercrystal, channel and interparticle. Analysis of limestone porosity in the study area is known to be 15.24% - 29.95%. The porosity value is categorized as good to excellent so the research area is very good as a groundwater reservoir rock.
Middle Eocene Nannofossil Assemblages Responding to Depositional Dynamics of the Elat Formation, Maluku Ratih C. F. Ratumanan; Vijaya Isnaniawardhani; Budi Muljana
JURNAL GEOCELEBES Vol. 7 No. 2: October 2023
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v7i2.25371

Abstract

The Kei Besar Island is mainly composed of the Elat Formation carbonate rocks. This research was conducted to determine the nannofossils assemblages in the Elat Formation to interpret the depositional dynamics during its formation. Lithological observations and sampling for nannofossil analysis were carried out on three measured stratigraphic sections: Section 1 - Hollat, Section 2 - Ngurdu, and Section 3 - Mata Hollat. A total of 47 species assigned to 25 genera of nannofossils were identified in 45 selected samples. The succession of the Elat Formation in the study area formed at NP16 to N17 or Middle Eocene. Stratigraphic reconstruction supported by biostratigraphy analysis shows that Section 3 at the lower (NP16 to NP 17), Section 2 in the middle part (NP 17), and Section 1 at the upper (NP 17). R-mode cluster analysis of nannofossils defined four species clusters (assemblies A, B, C and D) that tend to occur together. Q-mode cluster analysis defined five depth-distribution clusters (1, 2, 3, 4, and 5), each deposited under similar conditions. Based on large foraminifera, the succession was formed in fore reef setting in neritic bathymetric zone. Coarsening and thickening upward supported by the nannofossil assemblages indicate depositional dynamics which tend to be shallower. Reworked fossils, commonly found at the lower of the Elat Formation, show the mechanism of turbid currents in early deposition.
Identification Lithology of Geothermal Potential Areas Using the Electrical Resistivity Tomography (ERT) Method Raihana, Hana; Suhendra, Suhendra; Nazli, Khairun; Halauddin, Halauddin; Refrizon, Refrizon
JURNAL GEOCELEBES Vol. 8 No. 2: October 2024
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v8i2.25377

Abstract

The rock lithology of the potential hydrothermal area has been studied using Electrical Resistivity Tomography (ERT) in Pungguk Pedaro Village, Bingin Kuning District, Lebong Regency. Field data acquisition uses a stretch length of 480 meter with the MAE X612-EM Geoelectric tool that forms a straight line. ERT method, using Res2dinvx64 software. The study aims to determine the subsurface conditions of the potential hydrothermal area and the characteristics of the rocks that make up the hydrothermal area. The results of this study can be concluded that Pungguk Pedaro Village is dominated by clay, sandstone, sandy gravel, andesite, basalt, and granite rocks. In this study, measurements were taken with six lines to see variations in resistivity values as a reference for identifying potential geothermal lithologies. There is 1 line that cuts to five lines to validate the resistivity value of each line. Line 1 has no potential for hydrothermal distribution because there has been a mixture of hydrothermal water with mountain water, so this line will only provide groundwater.
Assessment of Landslide Susceptibility Microzonation using Microtremor Measurements Along Mountain Road in North Bengkulu–Lebong, Bengkulu Province Ulfa Nuramadani; Halauddin Halauddin; Suhendra Suhendra; Darmawan Ikhlas Fadli; Ardika Pratama Panjaitan; Jesika Erni Elfrita Sinaga
JURNAL GEOCELEBES Vol. 7 No. 2: October 2023
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v7i2.25476

Abstract

Based on the geological condition, the research location on the North Bengkulu - Lebong crossing is on the Sumatra fault zone that extends from south to north, which causes this area to have a morphological shape and topography of hills and hills extreme slopes. This research results in landslide-prone micro zonation based on GSS and PGA values obtained from Horizontal-to-Vertical Spectral Ratio (HVSR) method measurements. The research was conducted by measuring 25 research sites. The results of Peak Ground Acceleration (PGA) values processing at the research site, between 0.14 gal - 0.53 gal. Locations with the potential for landslides, shown in blue (0.14-0.29 gal), are located in several spots of the research site. The distribution of Ground Shear Strain (GSS) at the study site is evenly distributed at a value of 10-4, which indicates that the study site is prone to cracking and ground movement. In the distribution of GSS values, it is suspected that the location in the dark red color (10-3) has the highest potential to experience repeated landslides. Based on the results of the calculation of PGA and GSS values on the North Bengkulu - Lebong crossing, the points of landslide-prone locations can be known so that disaster mitigation can be carried out at these locations to reduce the risk that will occur.
Investigation of Sediment Layer Thickness Estimation at Bengkulu University Hospital Based on Microtremor Data Al Ansory, Andre Rahmat; Raihana, Hana; Farid, M; Hadi, Arif Ismul
JURNAL GEOCELEBES Vol. 8 No. 1: April 2024
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v8i1.28144

Abstract

Bengkulu is the capital of Bengkulu Province and is located in the subduction zone between the Eurasian and Indo-Australian plates. Bengkulu is also close to the major faults of Sumatra, namely the Musi fault, the Ketahun fault, and the Manna fault. Therefore, regional planning and infrastructure development for earthquake mitigation is necessary. The purpose of this study is to estimate the thickness of the sedimentary layers in the construction zone of Bengkulu Hospital during the earthquake attenuation phase. This study is conducted by surface geological analysis using the HVSR method; data analysis using microtremor data. The microtremor data were analyzed using the HVSR method to obtain the amplification value (A0) and the dominant frequency (f0). HVSR analysis gave dominant frequency (f0) values from 5.1 to 5.8 Hz, amplification (A0) from 1.64 to 5.91 times, and dominant period (T0) from 1.49 to 2.81 seconds. The values of A0, f0, T0 are interpreted with reference to the literature and surface geology as a moderate risk of seismic vulnerability, characterized by moderate to weak sedimentation and moderate amplification values.
Genesis of Bauxite Ore in Toba Area Sanggau District, West Kalimantan Province Aprillia, Ricka; Mukhtar, Wahdaniah; Setiawati, Septami; Asbanu, Govira Christiadora; Munzir, Ibnu
JURNAL GEOCELEBES Vol. 8 No. 1: April 2024
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v8i1.26521

Abstract

Indonesia's largest bauxite reserves are in the province of West Kalimantan, which is 703 million tons Bauxite is formed from rocks with a high relative aluminum (Al) content, low iron (Fe) content, and small amount of quartz. The mineralogy and characteristics of lateritic bauxite deposits are closely related to several factors, one of which is the texture and composition of the bedrock such as color, mineral composition, and shape of the ore. This study discusses the genetic type of bauxite deposits based on mineralogy and geochemistry using mineragraphic, XRD, and XRF methods. The primary data from bauxite ore samples were collected from the stockpile of PT. Dinamika Sejahtera located in Toba area. The quantitative result of the geochemical analysis indicates a higher amount of alumina observed using the XRF method. Granodiorite bauxite, which is bauxite coming from granodiorite bedrock, generally has abundant geochemical elements, especially SiO2 and Al2O3. The lateritic bauxite type in the Toba area is a product of granodiorite weathering from the Sepauk Tonalite formation is embedded within a clay matrix which exhibits a brownish to red color with coarse to boulder-size of concretion texture without relict. Some important elements in bauxite laterite deposits are Al, Fe, Si (Silicon), and Ti (Titanium). The comparison between Al and Si values is a benchmark for the economics of bauxite mines. Gibbsite is the major mineral in the bauxite ore, while hematite, goethite, kaolinite, and quartz are the accessory minerals. The deposit is recognized as Low-Fe bauxite due to comparing Al2O3, Fe2O3, and Si2O3 concentrations. The weathering process has altered the primary texture, remaining resistant and secondary minerals. The petrographic analysis shows the replacement of Gibbsite as bauxite ore which presents as kaolinite replacement and fills the mineral cracks. The result of this study is expected to be useful in determining the exploration method for the bauxite deposits.
Andesite Quality based on Compressive Strength Tests in the Ulujadi area, Palu City and the Banawa Area, Donggala Regency Alimuddin, Fauziah; Jaya, Asri; Sirajuddin, Haerany
JURNAL GEOCELEBES Vol. 8 No. 1: April 2024
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v8i1.27319

Abstract

The research location is located in the Ulujadi area, Palu City, Central Sulawesi Province, which is one of the areas that has abundant andesite mineral content. This research aims to optimizing use of andesite rocks in the Ulujadi area of ​​Palu City. The research was carried out using qualitative and quantitative methods in the form of rock sampling and laboratory analysis, namely compressive strength test analysis to determine the technical properties of rocks and petrographic analysis to determine the quality of andesite based on the minerals that make up it. The results of petrographic analysis show that the andesite rocks in the study area are composed of minerals that have a good level of resistance. ST 07 has a mineral composition of plagioclase (38%), pyroxene (5%), biotite (5%), hornblende (7%), and soil mass (45%), and has a compressive strength test of 123 MPa, included in the classification strong, and is used as a foundation for light to medium buildings (SNI 03-0394-1989). ST 08 has a mineral composition of plagioclase (32%), ground mass (50%), opaque minerals (5%), orthoclase (5%), quartz (4%), and hornblende (4%), with a compressive strength test value of 97MPa, including in the strong classification, and can be used as a foundation for light to medium buildings. Meanwhile, ST 09 has a mineral composition of plagioclase (30%), hornblende (12%), quartz (3%), biotite (3%), orthoclase (7%), pyroxene (5%), and soil mass (40%). ), it is included in the weak category due to the relatively high degree of weathering, and can only be used as an ornamental stone.
Subsurface Interpretation of the Panjang Fault Area, Lampung, Based on Geomagnetic Method Rasimeng, Syamsurijal; Fahruddin, Fahruddin; Valentin, Ferdio; Aurora, Theressia Githa; Nurlaili, Jesica
JURNAL GEOCELEBES Vol. 8 No. 1: April 2024
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v8i1.28303

Abstract

Research on the area along the Panjang Fault - Lampung, the area from the Teluk Betung to Tanjung Karang Barat area using the 19-T GSM PPM tool with base rover acquisition on 2 tracks 2 kilometers apart obtained 40 acquisition points with a spacing of 0.3 kilometers. This study aims to determine the type of lithology and subsurface rock structure by utilizing the susceptibility value of rocks from magnetic anomalies. In the process of processing magnetic anomaly data, upward continuation is carried out as high as 350 m which is intended to reduce the total anomaly with the upward anomaly results so that a residual anomaly is obtained. Next, make a 2D subsurface model on the incision A - B in the residual anomaly map. Based on the results of qualitative interpretation, the total magnetic anomaly of the research area illustrates positive to negative anomaly values with a tighter contour pattern that indicates the presence of a fault structure. While based on quantitative interpretation, the 2D modeling in incision A - B shows a susceptibility value of 0.100 cgs which can be identified as breccia tuff rock, a susceptibility value of 0.0391 cgs is thought to be rhyolitic tuff rock, pumice tuff rock, and sandstone tuff, and a susceptibility value of 0.150 cgs is a rock from the intrusion of Mount Betung in the form of andesite-basalt lava. In addition, rocks with a susceptibility value of 0.0024 cgs are metamorphic rocks. The correlation between 2D modeling and regional geology is seen in the research area, which is in the Tarahan Formation (Tpot), which is suspected to be a fault structure in the Bumi Waras area with a strike direction of NW - SE which is the course of geothermal manifestations or minerals.

Page 11 of 14 | Total Record : 137

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