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Rahmiati
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rahmiati@fmipa.unmul.ac.id
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kutaibasin@fmipa.unmul.ac.id
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Jalan Barong Tongkok No.4 Gunung Kelua Samarinda, East Kalimantan Province Indonesia - 75123
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Geosains Kutai Basin
Published by Universitas Mulawarman
ISSN : -     EISSN : 26155176     DOI : https://doi.org/10.30872/geofisunmul.v5i2
Core Subject : Science,
Earth & Planetary Sciences
Coastal and Ocean Dynamics Environmental of Geophysics Geodesy and Geography Geographic Information System Geology Geophysics Exploration Geotechnical/ geo-engineering Hazard Mitigation Hydrology Meteorology and Climatology Mining Engineering Seismology and Volcanology Oceanography
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geofisika
Articles 5 Documents
 1 
Search results for , issue "Vol. 8 No. 1 (2025)" : 5 Documents clear
Morphology and Mineral Analysis of Coal in Senoni Village, Sebulu District, Kutai Kartanegara Regency Using SEM-EDS Jamilah, Nur
GEOSAINS KUTAI BASIN Vol. 8 No. 1 (2025)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v8i1.1435

Abstract

Coal is formed through the process of coalification, which occurs with increasing temperature, pressure and time. The coalification process produces coal of varying quality depending on the level of organic maturity. Coal quality parameters are influenced by the minerals contained in the coal. To identify minerals in coal, a scientific approach can be used, namely SEM-EDS (Scanning Electron Microscope-Energy Dispersive Spectroscopy). In Senoni Village, coal mining is still minimal. To find out whether the coal in the area has good quality and has prospects for mining, it is necessary to do a coal quality test, namely by looking at the minerals contained in the coal. The first research stage is to take coal samples in the research area. Then the sample is prepared, namely making the sample in the form of chunks into granules with a size of 40 mesh. Furthermore, the SEM-EDS characterization test was carried out to determine the morphology and elemental content found in coal. The results obtained show that the minerals contained in coal are quartz, marcasite and calcite minerals. As well as the percentage of elemental content (C) 83.3%, (O) 16.0%, Na 0.1%, Al 0.2%, Si 0.1%, S 0.2% and Ca 0.1%. Based on the carbon content, this coal is classified as batuminous (good quality).
Analisis Pola Seismisitas Berdasarkan Nilai B-Value di Wilayah Laut Flores Rosidi, Fachrul; Azisyarlina, Dwi; Wati, Lia Nurfitriana; Munir, Rahmiati; Haryono, Arif; Imran, Muh
GEOSAINS KUTAI BASIN Vol. 8 No. 1 (2025)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v8i1.1478

Abstract

The Flores Sea, located within Indonesia's territorial waters, is an area with high volcanic and seismic activity due to its position within the Pacific Ring of Fire. The complex movement of tectonic plates frequently triggers earthquakes in this region. This study was conducted to analyze earthquake potential in three segments of the Flores Sea area based on b-value and to examine earthquake events with magnitudes ≥ 7.4 within the period from 2000 to 2023 using Matlab and Zmap applications. From the analysis, it was found that Segment 1 has a higher potential for major earthquakes due to its low b-value. Meanwhile, Segment 2 shows a b-value below 1.19, indicating a significant potential for major earthquakes. In contrast, Segment 3 exhibits a b-value above 1.11, suggesting a lower likelihood of large-scale earthquakes. However, significant earthquakes can still occur, such as the one in Lospalos in December 2021 with a magnitude of 7.6. This demonstrates that, despite lower risk based on b-value, major earthquakes remain possible. Overall, from 2000 to 2023 in the Flores Sea region, only two events were recorded with magnitudes exceeding ≥ 7.4: one in Segment 2 with a magnitude of 7.5 in 2005, and another in Segment 3 with a magnitude of 7.6 in 2021.
Estimasi Kedalaman Magnetic Basement di North Queensland, Australia dengan Menggunakan Metode Analisis Spektral Mawadah, Anis; Lepong, Piter; Natalisanto, Adrianus Inu
GEOSAINS KUTAI BASIN Vol. 8 No. 1 (2025)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v8i1.1468

Abstract

Metode magnetik adalah metode geofisika yang didasarkan pada variasi medan magnet yang disebabkan oleh perbedaan sifat megnetik batuan. Tujuan dari penelitian ini adalah untuk mengetahui estimasi kedalaman magnetic basement di North Queensland, Australia, berdasarkan data Intensitas Magnetik Total (TMI) di lokasi penelitian. Data megnetik diproleh dari website Commonwealth of Australia (Geoscience Australia). Penelitian ini menggunakan metode analisis spektral untuk memisahkan anomali magnetik yang dihasilkan oleh sumber yang lebih dalam (anomali regional) dan anomali magnetik yang dihasilkan oleh sumber yang lebih dangkal (anomali residual). Berdasarkan hasil penelitian, terdapat perbedaan anomali yang diperoleh dari 5 profil/garis yang mengarah dari Timur ke Barat pada peta lokasi penelitian. Hasil analisis spektral menunjukkan bahwa rata-rata kedalaman anomali regional dan residual masing-masing adalah 36,75 km dan 3,48 km yang menunjukkan kedalaman magnetic basement menjadi lebih dangkal ke arah utara pada lokasi penelitian. Di bagian selatan area penelitian, diperoleh kedalaman 75,51 km. Sedangkan semakin ke utara magnetic basement menjadi lebih dangkal yang diperoleh pada kedalaman 22,96 km. Hasil penelitian ini diharapkan dapat berguna dalam memetakan kedalaman basement magnetik di wilayah Gunung Isa, mengingat Gunung Isa merupakan kota tambang yang kaya akan mineral. Oleh karena itu, estimasi kedalaman ruang bawah tanah magnetik akan berguna untuk menentukan batas ruang bawah tanah dan sedimen untuk mengidentifikasi cekungan yang berpotensi mengandung mineral.
Karakteristik Maseral dan Peringkat Batubara Daerah Balikpapan Selatan Berdasarkan Analisis Petrografi Organik ., Jamaluddin; Pratikno, Fathony Akbar; Taslim, A. Ibnu; Kaunang, Imanuel
GEOSAINS KUTAI BASIN Vol. 8 No. 1 (2025)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v8i1.1448

Abstract

This study aims to characterize the maceral composition and determine the rank of coal from the Kampungbaru Formation in the South Balikpapan area based on organic petrography analysis. Coal samples were analyzed using reflectance microscopy to identify and quantify maceral components and measure vitrinite reflectance. The analysis results indicate that the huminite maceral group dominates the coal composition (60.7-84.6%), followed by liptinite (9.8-27.5%), and low inertinite (5.6-11.8%). Vitrinite reflectance ranges from 0.30-0.33%, indicating that the coal is in the lignite to sub-bituminous rank. This low coal rank reflects rapid deposition conditions and an anoxic to suboxic environment that inhibits the complete decomposition of organic matter.
Studi Identifikasi Ketebalan Sedimen Menggunakan Metode Ground Penetrating Radar (Gpr) Di Waduk Benanga, Samarinda Kalimantan Timur Arifin, Muhammad Syahrul; Mandang, Idris
GEOSAINS KUTAI BASIN Vol. 8 No. 1 (2025)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v8i1.1415

Abstract

Ketebalan sedimen merupakan jarak antara permukaan tanah dan lapisan batuan dasar bawah permukaan dari sedimen yang menumpuk di suatu tempat. Terbentuk lapisan sedimen dipengaruhi oleh arus yang membawa material dari arah hulu sungai. Penelitian ini menggunakan metode Ground Penetrating Radar (GPR) untuk memprediksi lapisan sedimen di Waduk Benanga dengan melalui beberapa proses filter, yaitu move starttime filter, subtract-mean (dewow filter), background removal filter, band pass butterworth filter, dan fk-filter. Hasil dari penelitian ini didapatkan lima lintasan dengan total kedalaman lapisan sedimen masing-masing, yaitu 2,7 meter yang merupakan hasil sedimentasi akibat erosi lahan disebabkan oleh arus yang mengalir dari hulu Sungai Pampang Kanan dan Sungai Pampang Kiri di Waduk Benanga.

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