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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 108 Documents
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INTERPRETASI KECEPATAN GELOMBANG SEISMIK REFRAKSI TOMOGRAFI DALAM PENENTUAN LITOLOGI BAWAH PERMUKAAN DI DESA BHUANA JAYA (STUDI KASUS : PT. KHOTAI MAKMUR INSAN ABADI) Linda, Fitria Nova; Lepong, Piter; Djayus, Djayus
GEOSAINS KUTAI BASIN Vol 2 No 2 (2019)
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.v2i2.473

Abstract

Research has been carried out to determine the subsurface lithology including rock type, rock layer thickness, weathered layer, and rock hardness level based on wave velocity seismic refraction tomography at Bhuana Jaya Village, PT. Khotai Makmur Insan Abadi by using the seismic refraction method. The measurement in this study uses the In Line technique, where geophone equipment is arranged in a straight line with 3 and 5 meters spacing between the geophone. Based on the results of study, there are two types of morphology namely hill and rice field areas. Hill area is interpreted which have lithology, the first layer has a thickness of less than 3 m with lithology in the form is soil as a weathered layer, the second layer has a thickness of less than 2 m with lithology in the form is siltstone, the third layer has a thickness is less than 9 m with lithology in the form is mudstone, and the fourth layer has a thickness of less than 9 m with lithology in the form is sandstone, where this area is located at very hard rock. While rice field areas are interpreted which have lithology, the first layer has a thickness of less than 10 m with lithology in the form is alluvium as a weathered layer and the second layer has a thickness of less than 10 m with lithology in the form is siltstone with sandstone inserts, where these areas are located at an easy to medium level of hardness.
Studi Numerik Upwelling di Daerah Perairan Kalimantan Timur Maulana, Restu Agesta Dwi; Yusuf, Mustaid; Perwitasari, Devina Rayzy
GEOSAINS KUTAI BASIN Vol 4 No 1 (2021)
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.v4i1.739

Abstract

The aim of this study is to predict the potential upwelling areas around East Kalimantan Waters, based on vertical current velocity, temperature, and salinity information through the COHERENS (A Coupled Hydrodynamical-Ecological Model for Regional and Shelf Seas) simulation, a three-dimensional hydrodynamic model. The model was performed simulation for one year period (1st January – 31th December 2016). Four major tidal constituents (M2, S2, K1, O1) and wind speed have used as generating force. The simulation results showed the upwelling areas as well as downwelling. The upwelling area located mostly in the southern parts of the Makassar Strait while only a few areas located in the vicinity of the East Kalimantan coastline.
APLIKASI METODE GEORADAR UNTUK IDENTIFIKASI STRUKTUR GEOLOGI DI JALAN HM. ARDAN RING ROAD 1 SAMARINDA Syam, Ardian; Lepong, Piter; Supriyanto, Supriyanto
GEOSAINS KUTAI BASIN Vol 2 No 1 (2019)
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.v2i1.355

Abstract

Research has been conducted to find out the geological structure on jl. HM. Ardan, Ring Road 1, Samarinda, East Kalimantan. Using Ground Penetrating Radar (GPR) and radar reflection profiling techniques, this method is done by bringing the receiver and transmitter antenna ground simultaneously above level and then utilize the electromagnetic wave propagations for subsurface structures identification, which in this method produce a distance value and depth in the form of radar grams. Based on the results of this study can be identified Track 1 and 2 do not show the path of a geological structure on this track because only the process that resulted in the folding Landing dash that formed folding based on field control. On track 3, based on the reflection pattern, it can be estimated there is a lithological contact between the constituent materials, on track 4 it is estimated that there is a fault down at a depth of 1.6 m to 3 m, and from the reflection pattern can illustrate the lithological contact between constituent rocks. on track 5 and track 6 there is a shallow fault and is estimated based on the diffraction pattern recorded there is a water channel at the end of the track.
TREN SAMBARAN PETIR CLOUD TO GROUND KOTA BALIKPAPAN TAHUN 2016-2018 Agfanny, Ferruzi; Djayus, Djayus; Supriyanto, Supriyanto
GEOSAINS KUTAI BASIN Vol 3 No 2 (2020)
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.v3i2.693

Abstract

Lightning strikes are very dangerous natural events and can cause significant damage such as fires. Apart from causing lightning strikes, damage can also result in death if contact with living things. Because it is very dangerous, it is necessary to have a reference regarding the level of threat of lightning strikes that occur in the study area. The purpose of this research is to determine the level of lightning threat in the city of Balikpapan in the period 2016 to 2018, to determine the trend or trend of lightning strikes each year. The 2016-2018 lightning strike data obtained from the NexStrom software and Lighting Detector 2000 is a type of Cloud to Ground lightning that is struck directly to the ground and is a lightning hazard for life, then this lightning strike data is processed to find the value of the level of lightning strikes. which occurred in the city of Balikpapan in 2016- 2018. The results of this study found that the average threat level of Balikpapan City lightning strikes and the value of the threat of lightning strikes in 2016-2018.
UJI DATA KONFIGURASI METODE RESISTIVITAS (KONFIGURASI WINNER, DIPOLE-DIPOLE, POLE-DIPOLE) BERDASARKAN PENGUKURAN LAPANGAN DAN UJI LABORATORIUM Dayattullah, Muhammad; Supriyanto, Supriyanto; Lepong, Piter; Rinaldi, Aditya
GEOSAINS KUTAI BASIN Vol 1 No 2 (2018)
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.v1i2.285

Abstract

Geoelectric Resistivity is one of the geophysical methods that utilize different electrical properties in the earth in the form of resistance type in rocks. In this research, was measurements on Kadrie Oening Street at Pulau Balang formation and measurement of laboratory scale resistivity at Electronic and Instrumentation Laboratory. From the field measurements, three configurations are used: Wenner Alpha, Dipole-Dipole and Pole-Dipole. From the three configurations, sandstone resistivity value between 11.93 W.m to 33.61 W.m, clay ranged between 3.86 W.m to 10.82 W.m, siltstone range between 4.80 W.m to 9.72 W.m, coal ranged between 83.88 W.m to 216.47 W.m. The resistivity data inversion shows that the Wenner Alpha and Dipole-Dipole configurations are more compatible with field conditions in displaying the slope of the coating than the Pole-Dipole configuration.
Studi Identifikasi Sebaran Ion Logam Pb, Cu, As dan Cd pada Air dan Sedimen di Perairan Bontang Kalimantan Timur Menggunakan Metode Kriging (Ordinary Kriging) ani, ani ani; Wahidah, Wahidah; Mandang, Idris
GEOSAINS KUTAI BASIN Vol 6 No 1 (2023)
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.v6i1.1001

Abstract

Bontang is one of the cities in East Kalimantan which is geographically located in coastal areas so that it is very vulnerable to marine pollution both from domestic human and industrial activities. This study aims to determine the level and pattern of distribution of poluton metal ions Pb, Cu, As and Cd in water and sediments in Bontang waters using the Kriging (Ordinary Kriging) method. In this study, 4 observation samples were used which were tested in the laboratory to determine the content of heavy metals. Furthermore, the data from laboratory tests along with 4 secondary data were interpolated using the ordinary kriging method with an exponential model to determine the pattern of contour distribution in Bontang waters. The results showed that the heavy metal with the highest distribution value in water and sediment is cadmium with a susceptibility value ranging from 0.006 mg/l to 9.070 mg/l. In general, the pattern of spread of heavy metals originates from coastal areas in a southeasterly direction. The most influential thing on this pattern of spread is tidal currents and bathymetry.
ANALISIS VARIABILITAS SPASIAL DAN TEMPORAL KONSENTRASI NITRAT DI LAUT HALMAHERA DAN LAUT BANDA MENGGUNAKAN METODE EMPIRICAL ORTHOGONAL FUNCTION (EOF) Sihotang, Zetsaona; Mandang, Idris; Munir, Rahmawati
GEOSAINS KUTAI BASIN Vol. 1 No. 1 (2018)
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.v1i1.163

Abstract

The East Indonesian ocean water is highly complex waters where it has become the passage of water masses from Pacific Ocean to Indian Ocean. Halmahera Sea and Banda Sea has an important role as one of the global ocean current trajectory from Pacific Ocean to Indian Ocean. The movement of water masses that occuring in this region has affect the condition and its fertility. One of the nutrients that affect the process of the growth of the pythoplankton and other microorganism is nitrate and it has become one of the indicators of waters fertility. This research aims to find out the effect of temperature and salinity on the change of nitrate concentration using Empirical Orthogonal Function (EOF) method. This method is used to separate the spatial and temporal data linkage in order to obtain the dominant spatial and temporal patterns. The data that used for the analysis was obtained from the output of the HYCOM (Hybrid Coordinate Ocean Model) model + NCODA Global 1/12º Reanalysis. The result of the analysis showing that the nitrate concentration was highly sensitive on the change of temperature in the ocean specifically in the Banda Sea region. The nitrate concentration increased during the East Monsoon where the sea surface temperatures dropped to 25ºC. In the West Monsoon, the sea surface temperature is warmer than usual so that the Banda Sea has a low nitrate concentration. In other hand, salinity did not show a significant effect on changes of nitrate concentration in the region of the Banda Sea and Halmahera Sea.
Analisis Spasial Ordinary Kriging Persebaran Emas Berdasarkan Data Geokimia Permukaan Awak Mas, Sulawesi Selatan Amalia, Ani; Lepong, Piter; Natalisanto, Adrianus Inu
GEOSAINS KUTAI BASIN Vol 5 No 2 (2022)
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.v5i2.798

Abstract

Kadar emas dapat diketahui dari hasil pengujian laboratorium dan atau dengan dilakukannya prediksi dengan teknik interpolasi Ordinary Kriging. Tujuan penelitian ini adalah untuk estimasi penyebaran kadar emas di Awak Mas Project menggunakan data sekunder dari hasil channel dan sampling data permukaan. Tahapan yang dilakukan adalah dengan memilih model semivariogram terbaik diantara semivariogram Spherical, Eksponensial, dan Gaussian dan menafsirkan pola penyebaran mineral emas menggunakan metode geostatistik ordinary kriging berdasarkan data sampling channel mineralisasi emas permukaan. Langkah pertama dalam pengolahan data adalah membuat semivariogram menggunakan software SGEMS dengan nilai nugget, sill, dan range masing-masing sebesar 0,01, 0,1, dan 600. Kemudian diinterpolasi menggunakan ketiga model untuk mendapatkan model terbaik berdasarkan nilai RMSE terkecil, model yang didapatkan adalah model Gaussian. Hasil dari penelitian ini adalah pola penyebaran mineral emas permukaan banyak ditemukan pada daerah barat laut (NW) dan barat daya (SW) yang dipengaruhi oleh struktur geologi
INTERPRETASI KARAKTERISTIK BATUBARA BERDASARKAN RESPON GEOPHYSICAL LOGGING DI KONSENSI TAMBANG PT. MITRA ABADI MAHAKAM Araujo, Hezronia; Supriyanto, Supriyanto; Rinaldi, Aditya
GEOSAINS KUTAI BASIN Vol 3 No 1 (2020)
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.v3i1.596

Abstract

Pada penelitian ini dilakukan interpretasi karakteristik batubara di konsensi tambang Separi 3, Tenggarong Sebrang, Kabupaten Kutai Kartanegara. Tujuan dari penelitian ini adalah untuk mengetahui karakteristik batubara bedasarkan data Geophysical Logging di area pertambangan PT. Mitra Abadi Mahakam. Terdapat berbagai metode untuk melakukan interpretasi karakteristik batubara. Dalam penelitian ini digunakan metode Geophysical Logging khususnya dengan respon Gamma Ray untuk mengetahui karakteristik batubara dari 3 titik lubang bor. Membandingkan data pemboran dengan data logging dengan cara melihat litologi dari kedua hasil data tersebut. Berdasarkan perbandingan data logging dan data log litologi dari inti bor, maka data log GR memiliki karakteristik akurasi kedalaman yang lebih baik dikarenakan kemenerusan pengambilan data, tidak seperti inti bor yang diambil setiap interval kedalaman 3 m. Dari pengolahan data diperoleh karakterisasi sifat fisik batubara secara keseluruhan, yaitu hitam, mengkilap, kompak, rapuh dengan ketebalan yaitu seam 1 dan 2 pada CC-29 dengan rata – rata ketebalan 4 dan 5 meter dengan range nilai Gamma Ray berkisar 0 – 36 API dan 12 – 58 API, seam 1 pada CC-2035R dengan rata – rata ketebalan 2 meter dengan range nilai Gamma Ray berkisar 0 – 52 API, seam 1 dan 2 pada CC-29 dengan rata – rata ketebalan 4 dan 2 meter dengan range nilai Gamma Ray berkisar 0 – 30 API. Lapisan batubara nya ditinjau dari karakteristik lingkungan pengendapan sangat berpengaruh terhadap pergerakan grafik gamma ray. Pada hasil ini karakteristik elektrofasies pada daerah penelitian yaitu cylindrical/boxcar. Daerah cylindrical/boxcar umumnya terbentuk atau terendapkan pada daerah rawa.
Identifikasi Sebaran Batu Bara dari Data Well Logging Menggunakan Metode Cross Section (Studi Kasus di PT. Khotai Makmur Insan Abadi, Kalimantan Timur) Hutabarat, Melisa; Djayus, Djayus; Suprianto, Suprianto
GEOSAINS KUTAI BASIN Vol 4 No 2 (2021)
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.v4i2.792

Abstract

Eksplorasi merupakan langkah awal dalam tahapan pertambangan yang perlu dilakukan dalam memenuhi kebutuhan konsumen. Tujuan penelitian ini untuk mengetahui sebaran batu bara berdasarkan masing-masing data log dan volume secara menyeluruh menggunakan metode cross section. Penelitian ini menggunakan data sekunder yang meliputi data titik koordinat, data bore hole, data Log Gamma dan Log Resitivtas. Data Bore hole dianalisis sehingga diketahui kedalaman dan ketebalan batu bara. Selanjutnya ditampilkan sebaran batu bara secara menyeluruh 3D menggunakan project Cross Section dan menghitung volume batu bara. Hasil penelitian menunjukkan sebaran seam batu bara yang paling sedikit yaitu 1 seam terdapat pada log KK08 dengan ketebalan rata-rata 0,665 m dan sebaran seam batu bara yang paling banyak yaitu 5 seam terdapat pada log KK02, dengan ketebalan rata-rata 1,004 m. Ketebalan seam batu bara yang paling tebal yaitu, seam 7 dan ketebalan seam batu bara yang tipis yaitu, seam 4. Hasil project Cross Section pada lima penampang didapatkan kemiringan seam batu bara yang relatif ke arah Barat dimana jurus lapisan batu bara berkisar antara N 190oE – N 200oE dengan dip berkisar antara 6o hingga 10o. Total volume 52.209.563 m3 dengan Tonase sumber daya tertujuk batu bara yaitu 67.872.432 ton/m3.

Page 6 of 11 | Total Record : 108

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