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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 7 Documents
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Search results for , issue "Vol. 9 No. 1: April 2025" : 7 Documents clear
Mapping of Soil Stability based on Shear Wave Velocity Values (Vs30) Using the Multichannel Analysis Surface Wave (MASW) Method on Kalimantan Highway, Rawa Makmur Village, Bengkulu City Aisyah Cindy Phylia Putri; Refrizon Refrizon; Arif Ismul Hadi; Andre Rahmat Al Ansory
JURNAL GEOCELEBES Vol. 9 No. 1: April 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i1.34956

Abstract

Kalimantan Highway in Bengkulu is a heavily traveled route and the main gateway to Bengkulu City from northern areas such as Arga Makmur and Ketahun sub-district, or Mukomuko regency also surrounding areas. Geological formations in the form of alluvium terraces (Qat) cause soil instability, often damaging the road surface. These include the formation of potholes and the occurrence of puddles during heavy rains. This research aims to determine the bearing capacity (stability) of the soil layer along Kalimantan Highway section in Rawa Makmur Village, Muara Bangkahulu District, and provide planning information through mapping. It is imperative to assess the condition of the soil layer. This research uses geophysical methods, specifically the Multichannel Analysis of Surface Wave (MASW) technique, using a MASW PASI 16S24-P digital seismograph to image subsurface soil conditions by analyzing shear wave velocity (Vs). A total of 20 data points were collected along the Kalimantan Highway section. The results of the Vs profile analysis were interpreted into soil classifications based on the criteria set out in SNI 1726:2019. The majority of the road sections were classified as SE (soft soil) and SD (medium soil), with some points designated as SC (hard soil/soft rock). This indicates that the geotechnical design for these road sections should consider supporting factors to maintain structural safety and stability.
Predicting the Distribution of CO2 Impurities in Hydrocarbons: Seismic Reservoir Characterization in the Northern South Sumatera Basin Ricky Rahmawati; Wahidah Wahidah; M Noor Alamsyah; Dadan Hamdani; Andi Alamsyah
JURNAL GEOCELEBES Vol. 9 No. 1: April 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i1.34399

Abstract

An oil and gas field containing less than 50% carbon dioxide (CO₂) impurities is considered economically viable. This study focuses on the 'X' area, located in the northern part of the South Sumatra Basin, and evaluates the sensitivity of elastic parameters—specifically P-impedance and Vp/Vs ratio—to hydrocarbon presence. Additionally, the study assesses the distribution of sandstone reservoirs within the Lower Talang Akar Formation (LTAF) using seismic reservoir characterization methods, while also analyzing the spatial correlation of natural CO₂ impurities. Using data from 11 wells equipped with S-wave logs, a multi-attribute analysis was applied to predict reservoir properties in 57 additional wells. Sensitivity analysis of hydrocarbons, reservoir, and non-reservoir zones was then conducted using elastic log parameters. Seismic attributes such as variance and ant tracking were utilized to detect fault patterns and potential fractures. Moreover, Relative Acoustic Impedance maps—based on negative and minimum amplitude summations—were generated to visualize sandstone reservoir distribution and CO₂ impurity saturation derived from well tests. Results show that hydrocarbons exhibit greater sensitivity to the Vp/Vs ratio than to P-impedance, although sandstone reservoirs generally display low P-impedance values. Faults in the LTAF surface trend north-south, northwest-southeast, and northeast-southwest, with the highest density in the eastern region of area 'X'. Thick sandstone reservoirs are predominantly found in the northern, southern, western, and southeastern sectors. CO₂ saturation trends decrease westward, aligning with reservoir presence and fracture intensity. Zones with thick reservoirs and low CO₂ levels are identified as key targets for future exploration and development.
Analysis of Landslide Hazard Levels on the Palopo – Luwu Road using GIS and Finite Element Method Anshar Abdullah Jawil; Kadek Nando Setiawan
JURNAL GEOCELEBES Vol. 9 No. 1: April 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i1.40206

Abstract

Indonesia is one of the countries that often experiences landslides during the rainy season. The Palopo–Luwu main road is a landslide-prone area in North Bastem sub-district because it has a topographic condition with a very steep slope. Therefore, it is important to conduct research on the analysis of the potential for landslides in the area. The method used in this study is Weighted Overlay based on Geographic Information Systems (GIS) in making landslide-prone maps. Data processing with weighting or scoring on parameters such as slope, rainfall, rock type, soil type, and land cover. While the Finite Element Method (FEM) is used to model slope stability with input data on physical and mechanical properties of rocks and slope geometry data as a basis for calculating the slope safety factor (FK). The results of the study showed that almost 85% of the research area is a high landslide potential area which is the Palopo–Luwu main road area, this was validated from laboratory test data which was then analyzed for slope stability showing FK value <1.25, which is 0.936 and the actual condition of the slope in the field has collapsed. The mapping results can be used as a useful tool for land use planning and risk reduction in the research area.
Microbiological Study of Escherichia Coli Contamination in Dug Wells in Demak District, Central Java Narulita Santi; Celsy Miftaqul Tiara Fanny; Dina Rahayuning Pangestuti; Thomas Triadi Putranto; Maya Aiko Salsabila Putri
JURNAL GEOCELEBES Vol. 9 No. 1: April 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i1.43184

Abstract

Demak Regency is a peri-urban area in Java experiencing an increasing demand for clean water due to population growth and development. Groundwater is the primary source to meet this demand, although its quality is often threatened by pollution from household waste and unprotected septic tanks. This study aims to evaluate groundwater quality in Demak District with the Escherichia coli presence parameter in unconfined aquifers using a GIS-based spatial approach and IDW interpolation method. The geology of the study area includes sandstone, carbonate mudstone, and alluvium lithologies, with most regions having flat slopes. The hydrogeological potential of the study area shows diverse aquifer productivity, with groundwater levels ranging from 0.3–41 meters. The results of the groundwater quality analysis in the study area showed that 47% of the samples exceeded the safe limit for Escherichia coli by Ministry of Health Number 2 Year 2023. The shallow depth of the groundwater table and poor well construction allow the infiltration of contaminants from the land surface into the groundwater, especially from polluting sources around the well. This study provides an essential overview of groundwater quality in the Demak District, which can support sustainable groundwater management and improved sanitation to improve public health.
Impact of El Niño - Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) on Air Temperature in Bengkulu City Mardho Tillah Edkayasa; Elfi Yuliza; Lizalidiawati Lizalidiawati
JURNAL GEOCELEBES Vol. 9 No. 1: April 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i1.43409

Abstract

Bengkulu City has experienced rising air temperatures due to climate variability events, particularly ENSO and IOD. This study analyzes the relationship between ENSO, IOD, and air temperature in Bengkulu over the past 20 years (2004-2023) using data from Meteorological and Climatology stations, as well as ONI and DMI indices from NOAA. Pearson and multiple correlation analyses show a temperature increase of 0.08-0.1°C per year. ENSO has a stronger influence than IOD, especially on maximum temperature ( r = 0.28-0.38). To strengthen the analysis, multiple linear regression was applied, revealing that ONI had a statistically significant positive effect on average air temperature, while DMI showed a weaker and insignificant influence ( r = 0.10-0.11). A phase-based composite analysis revealed that average temperatures peaked during El Niño combined with Positive IOD phases, highlighting their synergistic warming effect, with maximum temperature reaching 35.9°C (February 2019), and the lowest minimum temperature recorded at 18°C (September 2019). The temperature increase during El Niño poses risks such as prolonged dry seasons, increased drought, and disruption of coastal ecosystems. Therefore, adaptation measures such as early warning systems and water resource management must be integrated into regional planning, particularly in agriculture and health sectors in Bengkulu.
Application of 2D Seismic Modeling in Gas Hydrate Reservoir Characterization Welayaturromadhona Welayaturromadhona; How Wei Chen
JURNAL GEOCELEBES Vol. 9 No. 1: April 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i1.43451

Abstract

Gas hydrate reservoirs represent a significant unconventional energy resource with considerable potential for future energy supply and climate-related studies. However, their complex subsurface occurrence requires advanced geophysical methods for accurate detection and characterization. This study presents the application of two-dimensional (2D) seismic modeling to evaluate the seismic response of gas hydrate-bearing sediments and underlying free gas zones. The objective is to assess the reflection coefficients and amplitude variation with offset (AVO) to enhance the interpretation of subsurface features. The synthetic model is constructed using multichannel seismic data and velocity profiles derived from previous studies. Seismic wave propagation is simulated to observe the impedance contrasts across various subsurface layers. Results reveal that the Bottom Simulating Reflector (BSR), a key seismic indicator of gas hydrate presence, exhibits strong negative reflection amplitudes due to the presence of underlying free gas, which significantly reduces seismic velocity. Furthermore, AVO analysis shows that amplitude variations are highly sensitive to the acoustic impedance contrast at the hydrate-gas interface. These findings demonstrate the effectiveness of seismic modeling in improving gas hydrate reservoir characterization and provide a foundation for more accurate exploration strategies. The study contributes to both energy development and environmental monitoring efforts involving gas hydrates.
Source Rock Evaluation in the "Idea" Field, Bintuni Basin, West Papua: A Geochemical Approach Dea Ananda; Jamaluddin Jamaluddin; Warto Utomo; Joko Wiyono; Baiq Maulinda Ulfah; Amiruddin Amiruddin; Nijusiho Manik; Abdi Suprayitno
JURNAL GEOCELEBES Vol. 9 No. 1: April 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i1.43566

Abstract

The Bintuni Basin is one of the largest hydrocarbon-bearing basins in Eastern Indonesia, although only a limited number of oil and gas fields are currently. Consequently, further investigation into its petroleum system, particularly the potential of its source rocks. In hydrocarbon exploration, characterizing source rock is critical to evaluating the presence of organic-rich strata capable of generating hydrocarbons. Geochemical analysis is a widely used method for assessing source rock potential, utilizing total organic carbon (TOC), rock-eval pyrolysis, and vitrinite reflectance data. In this study, geochemical data were obtained from one well and two outcrop samples to evaluate the quantity, quality, and thermal maturity of organic matter. The geochemical assessment of rock samples from four stratigraphic formations indicates that the Permian Ainim Formation exhibits the highest source rock potential. TOC values range from 1% to 80% with hydrogen index (HI) values range between 13 and 431 mg HC/g TOC classifying the formation as a good to excellent potential. The dominant organic matter consists of kerogen type II/III suggesting the potential for both oil and gas generation. Thermal maturity analysis indicates that the Ainim formation has reached the oil and gas generation window at depths of 8,075–8,420 feet. These findings demonstrate that the Ainim Formation represents a significant source rock within the Bintuni Basin, contributing valuable insights into the region's petroleum system and hydrocarbon prospectivity.

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