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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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Analysis of Subsurface Layers using the Multichannel Analysis of Surface Waves Method in Manimbahoi, Gowa Regency: Analisis Lapisan Batuan Bawah Permukaan Menggunakan Metode Multichannel Analysis of Surface Waves di Manimbahoi Kabupaten Gowa Muhammad Ikram Ramadhan; Muhammad Altin Massinai
JURNAL GEOCELEBES Vol. 6 No. 2: October 2022
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v6i2.22025

Abstract

This research is about the structure of the soil layer at the research site in Manimbahoi, Parigi District, Gowa Regency. This research is very important considering that the location has experienced a mega landslide which resulted in some residents being not found. This study aims to provide an overview of the shallow soil layer at the landslide disaster location. This study uses one of the geophysical methods, Multichannel Analysis of Surface Waves (MASW) method, with 4 lines at points at the landslide location. Based on the results of the study, the velocity of the Vs30 wave was obtained in each line. On the first line the velocity of Vs30 is 303.5 m/s. On the second line the velocity of Vs30 is 284.1 m/s. On the third line the velocity of Vs30 is 309.0 m/s. On the fourth line the velocity of Vs30 is 256.1 m/s. Based on the soil classification by looking at the Vs30 velocity, it can be determined that the type of soil at the research location is medium soil (sand). Medium soil is unconsolidated sediment, described as soil composed of minerals that are not compact
Analysis of Productivity Synchronization of Barge Transportation Equipment and Crane Loading on Nickel Ore Delivery Activities in PT. Antam Nickel UBP North Maluku: Analisis Sinkronisasi Produktivitas Alat Angkut Tongkang dan Alat Muat Crane pada Kegiatan Pengapalan Nickel Ore di PT. Antam UBP Nikel Maluku Utara Fitria Dwi Ningsi Haya; Aliyusro Jolo; Yanny Yanny
JURNAL GEOCELEBES Vol. 6 No. 2: October 2022
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v6i2.22043

Abstract

Nickel mining activities at PT. ANTAM North Maluku Nickel UBP is closely related to the production and distribution process. To achieve optimal production, nickel ore is loaded or shipped in accordance with the company's production targets. The study aims to determine the compatibility value of barges and crane loading equipment in the shipping process and to determine the factors that affect the productivity of nickel ore shipments. The research method used is descriptive quantitative method, where the analysis process is based on distribution table data, average values, ​​and percentages. This research was conducted at the Tanjung Buli Site in the MV. shipping process. Lumoso Karunia VIII. In this shipment, the stowage plan target is 55255 tons which must be completed within a maximum of 10 days. The results of the calculation of the compatibility of crane loading equipment in MV. Lumoso Karunia VIII and barge transportation have a match factor value of 0.72 or <1. Factors that affect the decline in the shipping process are work efficiency time, the value of the match factor and rainy time. From the calculation results, the work efficiency time obtained is 65.94% or less efficient. The value of the match factor <1 can conclude that the transportation equipment is busy while the loading equipment has a lot of idle time and rain constraints with an average amount of rain time of 206.6 minutes or 3.44 hours. However, the shipping process can reach the production target within 8 days with the capability of loading equipment productivity reaching 6997.95 tons/day.
Using Grid Search and Guided Random Search (Simulated Annealing) Methods in Determining the Earthquake Hypocenter in the Majalengka Region, West Java on November 11, 2021: Penggunaan Metode Grid Search dengan Guided Random Search (Simulated Annealing) dalam Menentukan Hiposenter Gempa Bumi Daerah Majalengka, Jawa Barat pada 11 November 2021 Fachri Aldi Pramudya; Restu Ningsih; Hayu Nurfaidah; Siska Erna Sephiana; Rahmat Catur Wibowo; Ahmad Zaenudin
JURNAL GEOCELEBES Vol. 7 No. 1: April 2023
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v7i1.19975

Abstract

Tectonic earthquakes are generally caused by the release of energy produced by a pressure from a moving slab. This study aimed to test the use of grid search methods and guided random search in determining the hypocenter position of the earthquake in the case of the Majalengka regional earthquake, West Java which occurred on November 11, 2021. In this study used earthquake source data with the number of 5 stations, are COCO, KAPI, PALK, MBWA, and NWAO which can be accessed on the IRIS. From the results of determining the earthquake hypocenter using the grid search method, the position of the earthquake hypocenter is obtained with a latitude position of 6.596861oS and for a longitude position of 108.2871°E with a depth of 200 km, while from the processing of the simulated annealing method, the latitude position is 6.501645°S and longitude 108.2252°E with depth of 172.1 km. Meanwhile, if we compare the position of the earthquake hypocenter according to IRIS, are the latitude position of 6.6027°S and for the longitude position of 108.105°E with a depth of 164.41 km, because the hypocenter data from IRIS has been revised by a seismologist so that it is used as a reference, the results that are closest to the position according to IRIS are the results of the simulated annealing method.
Application of Self-Potential Method in Mapping Leachate Flow Around Rasau Jaya Landfills, Kubu Raya Regency: Penerapan Metode Potensial Diri (Self Potential) dalam Memetakan Aliran Lindi di Sekitar TPA Rasau Jaya Kabupaten Kubu Raya Kaharudin Kaharudin; Yudha Arman; Muhardi
JURNAL GEOCELEBES Vol. 7 No. 1: April 2023
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v7i1.20524

Abstract

This study uses the self-potential method to map the leachate flow around the Rasau Jaya landfill, Sungai Raya District, Kubu Raya Regency. The study was carried out in 2 areas, the north and south of the landfill. Data acquisition using a fixed base configuration by applying ten lines. Each line has a length of 105 m with 5 m, and the distance between the porous pots is 5 m. The measurement results show that the potential value distribution at the first location is -19.62 mV to 8.44 mV, and the potential value at the second location is -55.50 mV to 23.26 mV. The interpretation shows that leachate accumulation from the landfill in the first area has a potential value of -19.62 mV to -13 mV. The second location has a potential value of -55.50 mV to -36 mV. Based on isopotential contour maps, leachate accumulation in the first location is thought to be in the north to northeast of the landfill, while in the second location, it is thought to be in the southwest to the west of the landfill.
The Significance Relationship between Palynomorph Fossil Preservation and Grain Size in Rock: Case Study of Walat and Batuasih Formations, Sukabumi, West Java Rizki Satria Rachman; Winantris Winantris
JURNAL GEOCELEBES Vol. 7 No. 1: April 2023
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v7i1.22746

Abstract

Palynomorph is dust-sized material that is resistant to acids and can be preserved as fossils in sedimentary rocks. Fossil content in rocks is very diverse which is influenced by various factors, one of this factors is the texture of rock in form of grain size. The Walat and Batuasih Formations are sedimentary rock formations that have variety of grain sizes. This research aims to examine relationship or correlation between grain size and palynomorph preservation in rocks with case studies in the Walat and Batuasih Formations. 42 samples were taken from measured stratigraphic section and analyzed both grain size and palynomorph content. Statistical analysis with Normality Test using Shapiro Wilk and Liliefors; Homogeneity Test using Levene Test; and Non-Parametric Associative Test using Spearman Rank was conducted to see the relationship of these variables. Result, the Walat and Batuasih Formations have conglomerate, sandstone, mudstone and coal lithologies with quite variety of palynomorphs. Statistical results show that all variables have data that are not normally distributed with tendency to be non-homogeneous. Moreover, it was found that the grain size of rock had significant effect on the preservation of palynomorphs in the rock. Clay grains has positive correlation of 0.613 and sand grains has negative correlation of -0.653. This shows that the finer the grain size, the more effective the preservation of palynomorphs is.
Determination of Seawater Intrusion Zones Using the Resistivity Method in Kelurahan Soreang, Maros District, South Sulawesi Province: Penentuan Zona Intrusi Air Laut Menggunakan Metode Tahanan Jenis di Kelurahan Soreang, Kabupaten Maros Syamsuddin Syamsuddin; Muhammad Fajar; Andry Harmaji Wirawan; Nurul Salsabila; Rezky Rezky; Muhammad Fawzy Ismullah Massinai; Selfiana Selfiana; Bambang Harimei
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.v7i2.23710

Abstract

The seawater intrusion into the groundwater layer is one of the factors that can disrupt groundwater quality in Soreang Village, Maros Regency. This is a serious problem for the community in the area, so it is necessary to identify the seawater intrusion zone. Previous study using the resistivity method is in regional scale. In this study, two intersecting lines with a length of 470 meters each were acquired using the Wenner-Schlumberger array with a spacing of 10 meters to get local scale. Based on the resistivity value of the study area, there are three layers interpreted as a layer of fill (1 - 1000 Ωm), alluvium layer (1 - 6 Ωm) and limestone layer (≥ 7 Ωm). The seawater intrusion zone in the study area is in the alluvium layer with varying depths up to 40 meters subsurface. The results of this study can be a reference for the community or government in the search for fresh water.
Analysis of Unconventional Oil and Gas Reservoirs using Well Logging, Geochemical and Seismic Data: Analisis Reservoar Migas Non-Konvensional Menggunakan Data Well Logging, Geokimia, dan Seismik Rahmat Catur Wibowo; Aryka Claudia Eka Putri; Ordas Dewanto
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.v7i2.20603

Abstract

Since conventional oil and gas is under a depletion phase, unconventional oil, and gas have become prime candidates for current and future oil and gas production. Based on this, investment and research have increased significantly related to unconventional oil and gas exploitation, especially in the North East Java Basin, one of the sedimentary basins producing oil and gas. The research was conducted in the form of well-logging, geochemical, and seismic data analysis to determine the quality and quantity of oil and gas reservoirs. The thickness and TOC value of the reservoir were determined using well-logging data using the Passey method, resulting in a thickness ranging from 900-954 ft and an average TOC value of 3.87 Wt% in the Kujung III Formation. Based on geochemical data analysis, the reservoir has type II kerogen with an immature-early mature maturity level (Ro and Tmax). Meanwhile, based on seismic data, the reservoir thickens to the northwest, ranging from 500-600 m. Unconventional oil and gas reservoirs in the research area have the potential to be developed because they meet several criteria, such as being rich in organic material and thick, even though the maturity level is still in the immature phase. It is estimated that deeper areas will produce different levels of maturity as pressure and temperature increase.
Relocation of the Hypocenter of an Earthquake with the Double Difference Method in the Regional Study Area of Yogyakarta: Relokasi Hiposenter Gempabumi menggunakan Metode Double Difference Wilayah Kajian Daerah Istimewa Yogyakarta Fani Rohmiasih; Andi Andi; Nugroho Budi Wibowo
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.v7i2.22223

Abstract

The relocation of the earthquake hypocentre is necessary in order to determine the position of the earthquake centre with higher accuracy. An accurate hypocentre position is important for earthquake-prone areas mapping, seismicity analysis, and fault zone identification. The double difference algorithm technique using the hypoDD program can be used for hypocentre relocation. This article reports the earthquake relocation of 23 earthquakes in the Yogyakarta region recorded at four observation stations. The result shows that the hypocentre shift spreads randomly with a shift distance of less than 20 km, with the most shifting direction of the epicentre to the northeast. The Earthquake’s hypocentre after relocation in the land area is estimated to be triggered by a fault under the Gamping Wungkal Formation, while the earthquake around Mount Merapi is estimated to be triggered by volcanic activity. The Relocation result in the sea area show that the hypocentre leads to the subduction line.
Analysis of Seismotectonic Parameters and Earthquake Return Periods in The Nias Area (1980-2021): Analisis Parameter Seismotektonik dan Periode Ulang Gempa Bumi di Wilayah Nias Tahun 1980-2021 Riski Efrina Siregar; Lailatul Husna Lubis; Ratni Sirait; Novita Sari
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.v7i2.22348

Abstract

The Nias Islands region is an area prone to earthquakes with a very high level of earthquake activity. One reason is the source of the subduction zone which is in the northwest of the Nias Islands. The aim of this work is to determine the b-value, seismic index, and earthquake return period using probabilistic techniques. For the years 1980 to 2021, the Meteorology, Climatology and Geophysics Agency (BMKG) published data with a magnitude of 3-6.7 and a depth (H) of 10-300 Km. The research results obtained by calculating the highest b-value is 0.791 in South Nias district and the highest a-value is in the South Nias district of 3.97. Calculation of the highest seismicity index with a magnitude of 6.7 in South Nias district with a-value of 7.223191 with an earthquake return period of 14 years.
Advanced Processing of 2D Marine Reflection Seismic Data Using the Common Reflection Surface (CRS) Stack Method with K-L Filter Application: Pengolahan Lanjut Data Seismik Refleksi 2D Lait Menggunakan Metode Common Reflection Surface (CRS) Stack dengan Penerapan KL-Filter Emir Dzakwan Kamal Zein; Syamsurijal Rasimeng; Egie Wijaksono
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.v7i2.22588

Abstract

Data processing using the seismic reflection method is an important stage in the exploration of natural resources and minerals. This research was conducted to determine the effective and efficient stacking and filtering methods in reconstructing the subsurface geological structure of the earth from the results of data processing using ProMAX software. The data processing method used is the conventional stack and the Common Reflection Surface (CRS) stack. Aperture values of 0 ms – 50 m and 3000 ms – 150 m in the CRS stack process produce the most optimum seismic sections. Both methods produce a different quality of seismic cross-section display. The 2D cross-section model from the conventional stack method looks noisier than the results from the CRS stack method. In addition, the reflector pattern on the cross-section of the results of the CRS stack method is clearer and visible with a relatively large amplitude compared to the results of the conventional stack method. To maximize the quality of data display, data enhancement is applied, which is the K-L filter. The eigenimages value of 0.10% on the K-L filter with a horizontal window width of 120 is used to reduce random noise. Thus, an increase in the S/N ratio will be obtained in the seismic data so that the 2D cross-sectional model of the seismic reflection method can approach the original conditions of the subsurface geological structure.

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