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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 6 Documents
 1 
Search results for , issue "Vol 5 No 1 (2022)" : 6 Documents clear
ANALISIS HUBUNGAN NILAI HGI (HARDGROVE GRINDABILITY INDEX) ASH CONTENT INHERENT MOISTURE DAN TOTAL SULFUR TERHADAP NILAI KALORI BATUBARA DI PT. GEOSERVICES SAMARINDA KALIMANTAN TIMUR Yuliana, Yuliana; Djayus, Djayus; Munir, Rahmiati; supriyanto, Supriyanto
GEOSAINS KUTAI BASIN Vol 5 No 1 (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.v5i1.789

Abstract

Abstrak Kualitas batubara ditentukan oleh kandungan HGI, Ash Content, Inherent Moisture, Total Sulfur dan Kalori. Tujuan penelitian ini dilakukan untuk mengetahui hasil uji HGI, Ash Content, Inherent Moisture, Total Sulfur, kalori serta hubungannya dengan kalori batubara. Penelitian ini menggunakan data sekunder. Data selanjutnya dikelompokkan berdasarkan kelas kalori, kemudian dianalisis dengan regresi dan korelasi. Hasil penelitian ini adalah nilai rata-rata HGI kelas kalori sedang dan tinggi (5727, 6261) Cal/gr, Ash Content terhadap keempat kelas kalori (4609, 5600, 6361, 7394) Cal/gr, Inherent Moisture (4606, 5602, 6386, 7394) Cal/gr, Total Sulfur (4616, 5598, 6384, 7394) Cal/gr dan hubungan HGI terhadap kalori kelas sedang adalah positif dan kelas tinggi negatif, hubungan Ash Content terhadap setiap kelas adalah negatif, hubungan Inherent Moisture terhadap setiap kelas kalori adalah negatif dan hubungan Total Sulfur terhadap kalori kelas rendah dan tinggi adalah positif sedangkan kelas kalori sedang dan sangat tinggi adalah negatif. Kesimpulan dari penelitian ini adalah nilai rata-rata HGI (5727,6261) Cal/gr, Ash Content (4609, 5600, 6361, 7394) Cal/gr, Inherent Moisture (4606, 5602, 6386, 7394) Cal/gr serta Total Sulfur (4616, 5598, 6384, 7394) Cal/gr dan Hubungan HGI, Ash Content, Inherent Moisture dan Total Sulfur terhadap kalori rata-rata negatif kecuali HGI kelas sedang dan total sulfur kelas rendah dan tinggi dan berdasarkan hasil analisis interpretasi dari keempat parameter bahwa HGI tidak dapat menentukan kualitas batubara.
Uji Kualitas Batubara terhadap Kedalaman Lapisan Daerah Penambangan Pulau Bunyu dengan Metode Proksimat pada Lokasi 4 Pit Anugerah, Quintiza; Natalisanto, Adrianus Inu; PSP, Devina Rayzy
GEOSAINS KUTAI BASIN Vol 5 No 1 (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.v5i1.605

Abstract

The purpose of this research was motivated by the level of coal quality at each depth of the layer. Each coal company needs to do a quality testing when conducting exploring. In addition to measuring the amount of potential coal reserves, it also measures the quality level of the coal. Whether if carried out exploration or excavation can provide benefits, therefore in this research the author will conduct research on the effect of the depth level of the layer of coal using parameters such as calorific value, total sulfur, fixed carbon, volatile matter, ash, and moisture. As for the place of this research conducted at PT. lamindo inter multikon mining area of Bunyu Island, Bulungan Regency, North Kalimantan Province. From the results of this research it was found that the highest caloric value was the location of PIT 4.
Penentuan Nilai Parameter Gempabumi Menggunakan Metode Geiger dan Hukum Laska pada Pulau Lombok Sari, Bella Dessy Wulan; Djayus, Djayus; Supriyanto, Supriyanto; Hendrawanto, Benny
GEOSAINS KUTAI BASIN Vol 5 No 1 (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.v5i1.706

Abstract

Earthquake is an event of the Earth vibration caused by the shifting of rock layers on Earth immediately that caused by the shifting of tectonic plates. The aim of this study is to know the Earthquake's Parameter. The Earthquake that happened in Lombok, August 5th 2018, at 18:46:37 (Western Indonesian Time), with magnitude 7,0 SR. By using six Earthquake recording stations, there are KLNI (in Mataram), TWSI (in Sumbawa), SRBI (in Buleleng), DNP (in Denpasar), PLAI (in Plampang) and BYJI (in Banyuwangi). The Coordinate of each Earthquake observer station, P Wave and S Wave are included. The Epicenter value is analyzed using the Laska Law and the Hypocenter value is analyzed using the Geiger Method. The results showed the Earthquake Parameter with coordinates; Latitude: - 8.28 South; Longitude: 116,47 East, the Epicenter value of KLNI station is 100 km away, the TWSI station is 150 km away, the SRBI station is 300 km away, the DNP station is 300 km away, the PLAI station is 317 km away, the BYJI station is 483 km away and the hypocenter value is 30 km. Deduced from the depth, this Earthquake included into Shallow Earthquake and included as Main Shock or Main Earthquake.
Numerical Study of Hydrodynamics in the waters of Balikpapan Bay using Finite Volume Method Rahman, Suci Erniya; Yusuf, Mustaid; Nasution, Yuki Novia
GEOSAINS KUTAI BASIN Vol 5 No 1 (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.v5i1.793

Abstract

Suci Erniya Rahman. 2021. Numerical Study Hydrodynamic in the waters of Balikpapan Bay using Finite Volume Method. Supervised by Dr. Sc. Mustaid Yusuf, M.Si. and Yuki Novia Nasution, S.Si., M.Sc. Faculty of Mathematics and Natural Sciences, Mulawarman University. The hydrodynamic model FVCOM (Finite Volume Coastal Ocean Model) using the approach method finite volume has been applied to determine the distribution of tidal current patterns in the Balikpapan Bay area. The simulation was carried out for 30 days using river discharge and tides as generating forces. The simulation results has verified by using the Root Mean Square Error (RMSE) method on observation data in the Balikpapan Bay area. The results of the simulation and observation verification have a good agreement, which is 0.09917 meters. The smaller (closer to zero) RMSE value, is the better results of the observation and simulation match. The results of study showed that the pattern and average current velocity in Balikpapan Bay for 15 days (11-26 October 2012) was dominant out of the bay.
Analisis Kecepatan Tanah Maksimum di Daerah Akibat Gempa Bumi Lombok di Daerah Pengamatan Labuan Bajo, Waingapu dan Maumere Nusa Tenggara Timur 05 Agustus Tahun 2018 pangge, claudius eswinsky; Subagiada, Kadek; Djayus, Djayus
GEOSAINS KUTAI BASIN Vol 5 No 1 (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.v5i1.730

Abstract

The ground motion velocity of an earthquake can cause material damage and loss. The purpose of this study was to analyze the maximum ground motion velocity caused by an earthquake. The data used were secondary data for earthquakes that occurred in the Lombok area of ​​West Nusa Tenggara on August 5 2018 at 06:46:37 p.m indonesian middle time zone, with the observation areas of Labuan Bajo (East Nusa Tenggara), Waingapu (East Nusa Tenggara), and Maumere (Nusa Tenggara). East Southeast). The data of this research include the coordinates of the earthquake area, the coordinates of the observation stations, the magnitude of the earthquake, and the acceleration value of ground motion as a comparison. Those data furthermore calculated the epicenter distance, the earthquake intensity value, and the ground motion velocity value was analyzed then compared with the ground acceleration value after which it was connected to the MMI scale. The results showed that the ground velocity value of the Labuan Bajo observation area was 3.66 cm / s, Waingapu 0.99 cm / s and the Maumere area 0.98 cm / s with a damage effect according to the MMI category II scale.
SOIL MOVEMENT ANALYSIS BASED ON MAXIMUM SOIL SPEED PATTERNS DUE TO THE LOMBOK EARTHQUAKE Maulidsandy, Penta Adenata; Lepong, Piter; Mislan, Mislan
GEOSAINS KUTAI BASIN Vol 5 No 1 (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.v5i1.780

Abstract

ABSTRACT Earthquake activity in Lombok, West Nusa Tenggara (NTB) gives rise to ground movement, this ground movement can be used to predict the intensity of the next earthquake. The purpose of this study is to determine the movement of land based on the pattern of maximum soil velocity that occurred due to the Lombok Earthquake July 29, 2018, which can be used to predict the intensity of the next earthquake. This study uses secondary earthquake data (magnitude) obtained from the USGS (United States Geological Survey). Magnitude data were analyzed using empirical formulas so that the values ​​of intensity, maximum ground velocity and contour maps were obtained. The results show that the movement of the land due to the earthquake moved very quickly towards the north, quickly towards the east, quickly towards the south and finally to the south slowly. The highest maximum ground velocity located in Obel-Obel Village with the value of 23,2 cm / s. The calculation result in the form of this maximum ground velocity can be used as a parameter to predict the upcoming earthquakes that will occur at Lombok or the other side of world.

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