Jurnal Geocelebes
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
Articles
137 Documents
<![CDATA[Stochastic Inversion in Determining the Distribution of Petroleum Carrying Sandstones in the "JS" Field of the South Sumatra Basin ]]>
<![CDATA[Situmorang, Johannes Kurni Bintang Awan]]>;
<![CDATA[Tampubolon, Gindo]]>;
<![CDATA[Juventa, Juventa]]>;
<![CDATA[Suhban, Muhammad]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 8 No. 1: April 2024 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.20956/geocelebes.v8i1.30785
<![CDATA[The "JS" field is a field located in the South Sumatra Basin, where the field has good prospects for the distribution of petroleum-bearing sandstone. The target of this research is the Air Benakat formation. This research uses the stochastic seismic inversion method to determine the probability of finding petroleum in sandstone. Stochastic seismic inversion has the advantage that it can overcome thin layers and can reduce existing data misalignments. So stochastic inversion can overcome the shortcomings of other seismic inversions, especially model-based seismic inversion which is the initial model for stochastic seismic inversion. Stochastic seismic inversion produces several realizations by showing uncertainty so as to get results that are close to the actual situation. Probability map of oil-bearing sandstones located in the north and east of the study area. with the slice results obtained for the acoustic impedance range of 8517-9051(m/s)*(g/cc) and oil sand probability with a value range of 0.61-0.78%.]]>
<![CDATA[Application of Seismic Refraction Tomography in Determining the Soil Hardness Level in IKN Nusantara Area ]]>
<![CDATA[Alamsyah, Andi]]>;
<![CDATA[Lepong, Piter]]>;
<![CDATA[Wahidah, Wahidah]]>;
<![CDATA[Rahmiati, Rahmiati]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 8 No. 1: April 2024 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.20956/geocelebes.v8i1.32159
<![CDATA[Numerous studies supporting infrastructure construction are currently underway in the New Capital Territory of Nusantara (IKN Nusantara). A geophysical method known as Seismic Refraction Tomography (SRT) has been employed within the IKN Nusantara to identify hard and soft layers based on the P-wave velocity (Vp). The data acquisition involved 24 channels of geophone spaced at intervals 3 and 4 meters. Measurements were conducted alongfour trajectories of 69 and 92 meters, reaching penetration depths of 12 – 20 meters. P-wave velocity values ranging between 200 – 3500 m/s were recorded. Additionally, the Unconfined Compressive Strength (UCS) value was determined using an empirical equation tailored for mudrock-shale lithology, establishing the correlation between Vp and UCS. In the shallow depths of 0 – 3 meters, UCS values indicated levels below 20 MPa, classifying the materials as having low to medium hardness. However, at depths greater than 3 meters, this layer transitioned to material with high hardness levels, as evidenced by UCS rate exceeding 20 MPa across all trajectories. This suggest that the IKN Nusantara is conducive to infrastructure development.]]>
<![CDATA[Analysis of Ground Vibration Levels Due to the Blasting Process at PT. Bumi Suksesindo ]]>
<![CDATA[Tarumasely, Nofry Hence]]>;
<![CDATA[Wardana, Novandri Kusuma]]>;
<![CDATA[Prastowo, Rizqi]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 8 No. 1: April 2024 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.20956/geocelebes.v8i1.32853
<![CDATA[Ground vibration is one of the effects of the blasting process; when the ground vibration reaches the highest level, it will disturb comfort and even cause damage to the surrounding building structure. This research aims to determine the magnitude of ground vibrations in Pit A and Pit C, as well as determine the relationship between Peak Particle Velocity (PPV) and scaled Distance, and determine the maximum explosive charge weight per delay based on the SNI 7571: 2010 reference. Actual ground vibration measurement data during research based on PPV theory and the actual PPV power regression relationship with scaled distance was used to obtain a ground vibration prediction formula to be a reference for determining the amount of explosive filling per delay. The ground vibration produced in the blasting process is hoped not to exceed the safe threshold. Prediction of the ground vibration formula at 100 m to 1500 m according to the US Bureau of Mines where the Mean Squared Error (MSE) value is 0.54, the MSE value from the Langefors-Kihlstrom equation is 1.85 while the MSE value from the Ambersays-Hendorn equation is 0.31 with the slightest deviation is very good to use as a reference for predicting ground vibrations with the predicted PPV formula. Hence, the maximum explosive charge with a PPV limit of 2 mm/s is 2.452 kg, a PPV limit of 3 mm/s is 11.332 kg, and a PPV limit of 5 mm/s is 23.040 kg. The factors that influence ground vibration are the Distance from the blasting location to the measurement location and the maximum number of explosives per delay, so the results taken from this research are that blasting in Pit A and Pit C is still categorized as safe for infrastructure and community housing.]]>
<![CDATA[Regional Lineament Pattern and Morphotectonic Analysis: The Investigation of Geological Structures and Present-Time Relative Tectonic Activity in the Tin Granite Area of Belitung Island, Indonesia ]]>
<![CDATA[Hutami, Harnanti Yogaputri]]>;
<![CDATA[Anas, Nur Ayu]]>;
<![CDATA[Fattah, Erlangga Ibrahim]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 8 No. 1: April 2024 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.20956/geocelebes.v8i1.33887
<![CDATA[Belitung Island is located on the East Coast of Sumatra and is the southernmost extension of the Southeast Asian granite belt. Despite the flat terrain of the island, numerous granite outcrops provide insight into the past tectonic activities that caused the uplift in the region. This study analyzes the current state of Belitung's tectonic activity by examining its morphotectonic index and lineament pattern. A National Digital Elevation Model (DEMNAS) dataset with a resolution of up to 8.1 m will be used to assess the geological patterns and relative tectonic activity from the surface. The relationship between the regional lineament system and morphotectonic quantification throughout the landforms of Belitung Island will also be considered. The modified Segmented Tracing Algorithm (m-STA) technique extracted the lineament features. The Index of Relative Active Tectonic (IATR) was calculated by averaging several morphotectonic indices, such as asymmetry factors (AF), stream-length index (SL), mountain-front sinuosity (Smf), and valley floor width-height ratio (VF) factors, to quantify the relative tectonic activity of the area. The combination of the two methods shows that Belitung is currently experiencing relatively weak tectonic activity compared to the past. This is supported by the surface appearance, which is mainly composed of lowlands. Several granite outcrops and highlands are aligned along the NW-SE and NE-SW directions, corresponding to the main geological structures in the area.]]>
<![CDATA[1D Audio Magnetotelluric Modelling for Deep Aquifer Identification in the Lava Fan Area of Haruman Peak, Malabar Mountains ]]>
<![CDATA[Rahmawati, Nabilah]]>;
<![CDATA[Kusuma, Nabila Putri]]>;
<![CDATA[Hanifah, Shofie Dzakia]]>;
<![CDATA[Junursyah, G.M. Lucki]]>;
<![CDATA[Harja, Asep]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 8 No. 1: April 2024 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.20956/geocelebes.v8i1.33969
<![CDATA[The Malabar Mountains area acts as a catchment and infiltration zone for rainwater. Haruman Peak is the location of one of these areas. Information on the well-preserved depth of the shallow aquifer at 40 meters reinforces this. This research reviews the results of subsurface 1D resistivity structures from AMT data to obtain information on the depth of deep aquifers on the western slope of the Haruman Peak Lava Fan, Haruman Mountains. 1D modelling shows an aquifer at depth of 140.56-2080.07 meters with resistivity ranging from 5.25-68.08 Ωm. At depths of 453.32 m (HR02), 530.8 m (HR03), 1464.97 m (HR01), and 2080.07 m (HR02), interbedded tuff-andesite with minor pumice identifies the deep aquifer. In addition, a depth of 140.56 m (HR02) with a resistivity value of 68.08 Ωm indicates a shallow aquifer. Looking at the elevation of the Bandung Basin, water from aquifers located at elevations > 700 meters above sea level will flow into the Bandung Basin.]]>
<![CDATA[Identification of Sub-Fault Zone Using Magnetotelluric Inversion (Case Study: Ketaun Fault, Lemeu Village, Lebong Regency) ]]>
<![CDATA[Rahmawati, Nurul Ilmi]]>;
<![CDATA[Farid, Muchammad]]>;
<![CDATA[Hadi, Arif Ismul]]>;
<![CDATA[Al Ansory, Andre Rahmat]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 8 No. 2: October 2024 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.70561/geocelebes.v8i2.34588
<![CDATA[Lemeu Village, Lebong Regency, borders the Bukit Barisan Mountain range and is crossed by the Ketaun Fault, which causes a high level of seismic activity, so it is necessary to conduct research on the potential existence of the Ketaun sub-fault as one of the efforts to mitigate natural disasters such as earthquakes. The Magnetotelluric method utilises the earth's natural electromagnetic field, which is used to determine the distribution of resistivity in the subsurface using the ADU-07e Magnetotelluric tool with two horizontal electrical sensors (Ex, Ey) and three horizontal (Hx, Hy) and vertical (Hz) magnetic sensors and uses seven research points with an interval of 1 km. Data processing uses MAPROS software to convert data from the time domain to the frequency domain and ZONDMT2D to obtain subsurface resistivity values. The results obtained from this study are 2D magnetotelluric cross sections showing a zone with low resistivity values between research points P4 and P5 which is thought to be a new fault zone with resistivity values ranging from 1.3 – 6.1 Ωm from a depth of 2.5 km to a depth of 10 km. The zone is assumed to be a new fault that is a branch of the Ketaun fault.]]>
<![CDATA[Study of the Digital Geological Compass in Increasing the Effectiveness and Efficiency of Measuring Geological Structure Data in the Field ]]>
<![CDATA[Hendrawan, Rezki Naufan]]>;
<![CDATA[Irsyad, Muhammad]]>;
<![CDATA[Gunawan, Aditya]]>;
<![CDATA[Zainuddin, Ahmad Dennil]]>;
<![CDATA[Widiatama, Angga Jati]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 8 No. 2: October 2024 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.70561/geocelebes.v8i2.36276
<![CDATA[This study compares the use of analog geological compasses and digital geological compasses in measuring fracture planes on crystalline rocks at the Lampung region. The measurement results demonstrate that using digital compasses yields higher time efficiency than analog compasses, with a reduction in measurement duration of over 50%. Although the dominant directions of the fracture planes were similar between the two methods, the inclination values and accuracies of each plane were not always consistent. Data processing using rose diagrams and stereonets indicates that the RockD application provides comparable results to measurements obtained using analog compasses. Therefore, the use of digital compass applications such as RockD can serve as an efficient alternative for geologists in collecting field data related to rock fractures, particularly in the context of quantitative data. However, analog geological compass is still recommended for measuring planes with on single-plane characteristics, such as rock bedding and fault mirrors. This study demonstrates the potential for development and transformation from analog geological compasses to digital geological compasses, and further research is needed to investigate the minimum number of fractures that can be measured with a digital geological compass to be considered statistically valid.]]>
<![CDATA[Drought Analysis in Ketapang District using the Keetch-Byram Drought Index Method ]]>
<![CDATA[Massuro, Lusyndatul]]>;
<![CDATA[Adriat, Riza]]>;
<![CDATA[Muliadi, Muliadi]]>;
<![CDATA[Ihwan, Andi]]>;
<![CDATA[Sutanto, Yuris]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 8 No. 2: October 2024 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.70561/geocelebes.v8i2.36474
<![CDATA[Ketapang Regency is one of the areas in West Kalimantan that is prone to drought. Drought can trigger forest and land fires. In this research, the Keetch-Byram Drought Index (KBDI) method was used to determine the level of drought in Ketapang Regency. The KBDI method relies on annual rainfall accumulation, daily rainfall, and maximum air temperature. The KBDI values obtained were correlated with the number of hotspots using Pearson correlation. This research was conducted throughout 2018-2022. Based on the monthly average KBDI value, the highest drought in Ketapang Regency occurred in August and September, while the lowest drought occurred in December and January. In terms of the annual average, the highest drought occurred in 2019. During the ENSO phenomenon in 2019, the El Niño phase experienced higher drought than the La Niña phase and normal years. In the El Niño phase, drought levels reach high to extreme categories. The correlation value between annual KBDI and the number of hotspots is 0.88, indicating a solid relationship. An increase in the KBDI value will be followed by an increasing number of hotspots.]]>
<![CDATA[Identification of Peridotite Bedrock using Resistivity Geoelectric Method in Lapao Pao Estuary Area, Kolaka District ]]>
<![CDATA[Haraty, Syamsul Razak]]>;
<![CDATA[Gusan, Muhammad]]>;
<![CDATA[Hasan, Erzam Salahuddin]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 8 No. 2: October 2024 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.70561/geocelebes.v8i2.36239
<![CDATA[Ultramafic rocks are the main source of nickel laterite deposits. One of the areas that has an ultramafic complex is located in Muara Lapao Pao Village, Kolaka Regency. The research was conducted in the mining area of PT Tri mitra Babarina Putra using the resistivity geoelectric method of the Wenner - Schlumberger configuration, In the area it is not yet known exactly how much peridotite bedrock is present in the subsurface. Therefore, it is necessary to conduct a geophysical survey in identifying the occurrence of peridotite bedrock, and can determine the depth and thickness of peridotite bedrock in the research area. the occurrence of peridotite bedrock in the mining area of PT Tri Mitra Babarina Putra has a resistivity value between 3000 – 17984 Ohm-meters. Peridotite bedrock in the research area on all four tracks has a depth and thickness that is almost uniform. lines 1 and 2 and 4 are at a depth of 34.5 - 39.6 meters with a thickness of up to 5.1 meters. and line 3 peridotite bedrock is at a depth of 40 m to more. There are 3 layers in the study area, namely, soil/overburden layer with a resistivity value of 16.5 – 122 Ohm-meters, serpentinite rock layer with a resistivity value of 200 – 2438 Ohm-meters and peridotite bedrock layer with a resistivity value of 3000 – 17984 Ohm-meters.]]>
<![CDATA[Estimation of Subsurface Structure Using Euler Deconvolution Method of Magnetic Data at the Geothermal Area of Sonai Village and its Surroundings, Konawe Regency ]]>
<![CDATA[Sariani, Sariani]]>;
<![CDATA[Manan, Abdul]]>;
<![CDATA[Bahdad, Bahdad]]>;
<![CDATA[Chahyani, Rani]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 8 No. 2: October 2024 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.70561/geocelebes.v8i2.36380
<![CDATA[It has been carried out research with the aim of determining the subsurface structure at the geothermal area of Sonai Village and its surroundings, Konawe Regency. The data used are magnetic data obtained through field measurements at 126 points in the N180oS direction. After the data were subjected to diurnal and IGRF corrections, a residual (local) magnetic field anomaly of around -150 nT to 90 nT was obtained. On the residual magnetic anomaly map which has been reduced to the Pole (RTP), the Euler Deconvolution (ED) method is applied to the Index Structure N=0 to estimate the subsurface structure in the form of the presence of minor faults, and it is known that there are 5 minor faults at a depth of around 9 to 38 meters. Information on the existence of these faults is then used in 2D modeling. Modeling results show that these minor faults cut through two rock layers, which are the layers composed of conglomerate rocks from the Alangga Formation and peridotites as bedrock from the Ultramafic Complex. One of the minor faults closest to the manifestation area (hot spring) is at coordinates around 4o1’12.412” S and 122o7’24.263” E to 4o1’15.532” S and 122o7’19.561” E with a distance of ±15 meters. The existence of these minor faults is thought to be the migration routes for heat flow or conduction to the surface at the geothermal area of Sonai Village and its surroundings.]]>
