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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 114 Documents
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STUDI LINGKUNGAN PENGENDAPAN MENGGUNAKAN DATA GEOFISIKA LOGGING DI PT. ADIMITRA BARATAMA NUSANTARA KALIMANTAN TIMUR Tamarindi Rachman Putr, Galih Adenanthera; Supriyanto, Supriyanto; Lepong, Piter
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.v3i2.691

Abstract

This research conducted at PT. Adimitra Baratama Nusantara which is located in the Balikpapan formation and based on the administrative map of PT. Adimitra Baratama Nusantara is located in Sanga-Sanga, Kutai Kartanegara Regency, East Kalimantan Province. This study uses logging geophysical data in the form of log gammaray and log density where in this logging analysis aims to determine the direction of the spread of the layer by using correlation and to determine the depositional environment at the study site. The results obtained in this study based on logging geophysical data is the correlation of the distribution layer to the northeast and the depositional environment contained is the lower delta plain depositional environment, this is because the characteristics of the lower delta plain depositional environment are thin coal and medium-sized sandstone. . The lower delta plain environment is affected by shallow water when the bay is filled with sediment.
ANALISIS SPASIAL PERGERAKAN MASSA AIR DI LAUT HALMAHERA DAN LAUT BANDA MENGGUNAKAN METODE EMPIRICAL ORTHOGONAL FUNCTION (EOF) Fachrudy, Muhammad Adi; Munir, Rahmawati; Mandang, Idris
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.v1i1.159

Abstract

The movement of water masses that occurred in the Indonesian Sea is the result of the interaction of two ocean, Pacific and Indian Ocean demonstrated by the change in salinity and temperature levels. Oceanographic research in Halmahera and Banda Sea have been carried out by analyzing changes in the level of temperature, salinity and currents on the surface of each season, West Monsoon and East Monsoon in 2010 by using Empirical Orthogonal Function (EOF). The verification of the data was done by comparing the temperature and salinity data were obtained from output of HYCOM model (Hybrid Coordinate Ocean Model) + NCODA Global 1/12 Reanalysis to observation data for 8 days in the Halmahera and Banda Sea. The results of the research showed changes in temperature and salinity that occurred in Halmahera Sea and have ranged between 28.5 ºC - 29 ºC and 34.1 psu - 34.6 psu was strongly influenced by water masses from the Pacific Ocean. The range of temperature and salinity have occurred during the West Monsoon, these water masses comes from the South Pacific moved towards Halmahera Sea brought by the New Guinea Coastal Current and that current was strong (1.06 m/s) at the time of East Monsoon took place in Indonesia. Unlike the Halmahera Sea, Banda Sea has a tendency to have temperature changes (26.9 ºC – 29.8 ºC) during the period of seasonal cycles that caused by its large region and the confluence of the water masses that come from Java Sea, Makassar Strait and affected by the temperature of Arafura Sea which has strong interaction from Indian Ocean.
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.
ANALISA STRUKTUR BAWAH PERMUKAAN DAERAH PROSPEK PANAS BUMI “GF-TNH” SUMATERA BARAT BERDASARKAN METODE GAYA BERAT Ramadhan, Adi Buchori; Djayus, Djayus; Lepong, Piter
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.v3i1.594

Abstract

The gravity method is one of the geophysical exploration methods based on the Earth's gravity field anomaly caused by variations in rock mass density laterally and vertically below the measuring point. The study area has a range of complete bouguer anomaly of -48.3 mGall up to -4.0 mGall and depth estimation with spectrum analysis showing a regional anomaly depth value of 2.43 km and a residual anomaly depth of 0.77 km which is interpreted as a boundary zone between bedrock and subsurface rocks that have more varied anomaly values. Then the separation of regional and residual anomaly was carried out using the Butterworth Filter and Second Vertical Derivative methods. From the results of the residual anomaly map shows the range of anomaly values ​​-0.5 mGall to 4.0 mGall. The map of residual anomaly shows a more complex pattern of anomaly because residual anomaly provide a lateral representation of rock mass distribution or the presence of geological structures below the surface that are relatively close to the surface of the earth. Then the residual anomaly map is made 3D inversion modelling with Second Vertical Derivative Technique to find out the fault and its type, then Derivative Analysis is performed. The geological structure in the study area is based on the results of inversion modelling and derivative analysis, dominated by faults and the type of fault is reverse fault and normal fault and the type of rock is dominated by igneous rock which has a high density value.
Pengaruh Inherent Moisture Terhadap Nilai Kandungan Kalori Pada Batubara Kaltim (Studi Kasus Data Im dan Data Kalori Tahun 2019 di PT. Geoservices Samarinda) Yanti, Nurma; Djayus, Djayus; Suprianto, Suprianto; Natalisanto, Adrianus Inu
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.v4i2.746

Abstract

Nilai kalori batubara dipengaruhi oleh beberapa faktor seperti kandungan air bawaan (inherent moisture) atau IM, abu (ash), karbon tetap (fixced carbon), total sulfur dan zat terbang (volatile matter). Tujuan penelitian ini untuk mengetahui berapa jumlah sampel batubara yang masuk ke dalam kelas kalori rendah, kelas kalori sedang, kelas kalori tinggi dan kelas kalori sangat tinggi, pengaruh inherent moisture terhadap nilai kalori batubara dan gambaran umum IM dan kalori batubara. Penelitian ini di lakukan di PT.Geoservices Samarinda, penelitian ini menggunakan data sekunder yaitu data kalori dan IM tahun 2019. Dilakukan perhitungan sebaran frekuensi nilai kalori dan IM. Kemudian kedua jenis data tersebut di plot untuk melihat pengaruh IM terhadap kalori. Hasil penelitian menunjukkan jumlah sampel kelas kalori rendah sebanyak 496 (11.4%) didominasi oleh IM kategori sedang, kelas kalori sedang 3146 (72.3%) didominasi IM kategori sedang, kelas kalori tinggi 649 (14.92%) didominasi IM kategori rendah, dan kelas kalori sangat tinggi 60 (1.38%) didominasi IM kategori rendah. Nilai korelasi IM terhadap kalori pada kelas kalori rendah -0.46, kelas kalori sedang -0.60, kelas kalori tinggi -0.90 dan kelas kalori sangat tinggi -0.79 hal ini menunjukkan bahwa semakin tinggi nilai IM nilai kalori akan semakin rendah. Sebanyak 72.3% batubara masuk dalam kelas kalori sedang dengan nilai IM antara 14.22-16.13 %adb (air dried base).
PEMETAAN DAERAH RAWAN KERUSAKAN AKIBAT GEMPA BUMI DI WILAYAH KOTA PALU TAHUN 2000-2018 BERDASARKAN NILAI PERCEPATAN TANAH MAKSIMUM Saputra, Ary Rhamadan; Djayus, Djayus; Supriyanto, Supriyanto
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.v2i2.466

Abstract

Abstract Palu is the city passed by the Palu-Koro active fault so that tectonic earthquakes often occur, some of which are followed by tsunamis, liquefaction and soil movements. The purpose of this research is to determine the value of peak ground acceleration based on earthquake data from 2000-2018 and to find out areas prone to earthquake damage based on the value of peak ground acceleration in the city of Palu. The data in this research are historical data of earthquakes from 2000-2018 with magnitudes 4.5-9 on the Richter scale and depths of 0-70 Km from USGS (United States Geological Survey) as much 9 data. Earthquake data is processed using empirical equation model Mc. Guirre K. and Donovan to get the value of peak ground acceleration at each specified observation point (grid) by the boundary area 0o37’ LS - 0o58’ LS dan 119o45’ BT - 121o3’ BT. The value of Peak Ground Acceleration at each observation point is processed using software for mapping to get the mapping results. Results of the research, the value of Peak Ground Acceleration in the city of Palu was based on earthquake data from 2000-2018 with Mc. Guirre R.K model ranging from 105,442 - 108,899 gal while the Donovan model ranging from 112,832 - 116,585 gal. The level of earthquake damage in the city of Palu from the highest to the lowest in sequence, namely the districts of North Palu, Tawaeli, Mantikulore, East Palu, Ulujati, West Palu, South Palu and Tatanga.
ANALISIS KADAR EMISI TRANSPORTASI DI SAMARINDA BERDASARKAN TIPE MESIN DAN KAPASITAS MESIN Yanti, Derli; Mislan, Mislan; Djayus, Djayus
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.v3i2.696

Abstract

Transportation emission levels can be analyzed based on the type of engine used. The purpose of this study is to determine the level of vehicle emissions each year and compare in samarinda. This research was conducted by measuring air emissions in different tool brands, the sukyoung SY-GA 401 brand used was the type of injection engine and carburetor, and the AGS-688 brand used was a diesel / diesel engine type where the measurement of the emission levels used the tool Automotive Emission Analyzer. Data was collected at the Kesuma Bangsa, Slamet Riyadi, and Wahid Hasyim points in 2013, 2014, 2015, 2016, 2018 in samarinda region known data on air emission levels, namely: Total pollutants of carbon monoxide (CO), carbon dioxide (CO2), carbon monoxide correction (COcorr), hydrocarbons (HC), oxygen (O2) and lambda (λ). The results showed that the analysis of air emission levels with the highest type of pollutant injection machine, namely HC in 2015 was 107.82 ppm based on the quality standard limits set by LH regulation No 05 of 2006 did not exceed the quality standard threshold of 200 ppm, pollutant carburetors the highest was found in HC pollutants in 2015 amounting to 434.35 ppm exceeding the quality standard threshold of 200 ppm and the highest solar pollutants were in the opacity pollutants in 2015 of 80.28% HSU based on the quality standard threshold stipulated by LH Regulation 05/2006 exceeding the quality standard threshold of 70% HSU.
STUDI NUMERIK TIDAL FRONT DI PERAIRAN TELUK BALIKPAPAN MENGGUNAKAN MODEL HIDRODINAMIKA Ramadhana, Muhammad Fauzi; Yusuf, Mustaid; Mubarrok, Saat
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.v1i2.289

Abstract

Model hidrodinamika dua dimensi COHERENS (Coupled Hydrodynamical Ecological Model for Regional and Shelf Seas) telah diaplikasikan untuk mengetahui pola tidal front di perairan sekitar Teluk Balikpapan. Simulasi dilakukan pada bulan Juli 2014 dengan menggunakan delapan komponen pasang surut utama sebagai gaya pembangkit. Konstanta harmonik dari komponen pasang surut yang diterapkan pada batas terbuka tersebut diperoleh dari NAO99b. Hasil simulasi model diverifikasi dengan membandingan antara data elevasi pasang surut dan data DISHIDROS yang diindikasikan dengan nilai RMSE (Root Mean Square Error) sebesar 0,15 meter. Hasil verifikasi menunjukkan bahwa hasil simulasi model memiliki kesesuaian yang cukup baik. Hasil penelitian menunjukkan bahwa nilai critical dari log (H/U3) di perairan Teluk Balikpapan adalah sekitar 3 yang mana nilai tersebut diindikasikan sebagai garis tidal front.
ANALISIS KLASIFIKASI LAJU EROSI MENGGUNAKAN METODE UNIVERSAL SOIL LOSS EQUATION (USLE) DENGAN SIG DI KOTA SAMARINDA Sadewo, Wisnu; Subagiada, Kadek; Djayus, Djayus
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.v6i1.1011

Abstract

Peningkatan jumlah penduduk akan membuat kebutuhan akan sumber daya dan lahan akan semakin meningkat. Pemanfaatan sumber daya alam dan pembukaan lahan yang berlebih akan menimbulkan berbagai permasalahan, salah satu permasalahanya adalah erosi. Penelitian ini dilakukan untuk mengetahui klasifikasi lajur erosi di Kota Samarinda serta mengetahui sebaran erosi dengan kategori sangat berat di Kota Samarinda. Perhitungan laju erosi didasarkan pada empat faktor yaitu, faktor erosivitas curah hujan (R) dihitung dari intepretasi data curah hujan, faktor erodibilitas tanah (K) ditentukan dari analisis peta jenis tanah, faktor kelerengan (LS) ditentukan dari analisis data DEM (Digital Elevation Model), faktor vegetasi dan tutupan lahan (CP) ditentukan dari peta tutupan lahan. Berdasarkan empat fakor tersebut selanjutnya dihitung klasifikasi laju erosi dengan menggunakan metode Universal Soil Loss Equation (USLE). Hasil penelitian menunjukkan hasil klasifikasi laju erosi di Kota Samarinda menunjukkan 46,23 % dari luas wilayah tergolong sangat ringan ( <15 ton/ha/th); 8,37 % tergolong kelas ringan (15-60 ton/ha/th); 7,76 % tergolong kelas sedang (60-180 ton/ha/th); 18,94 % tegolong berat (180-480 ton/ha/th), dan 18,70 % wilayah yang tergolong pada kelas erosi sangat berat ( >480 ton/ha/th). Luas sebaran erosi di Kota Samarinda dengan kategori sangat berat yaitu 480 ton/ha/th memiliki luas sebesar 12442,37 Ha atau setara dengan 18,70 % luas wilayah Kota Samarinda, hal ini disebabkan pada wilayah tersebut kondisi lahan sudah terbuka tanpa penutup diatasnya yang menyebabkan tanah akan mudah tererosi karena tidak adanya faktor yang menghambat laju erosi
Studi Sebaran Batuan Intrusi Menggunakan Metode Geolistrik Resistivitas Massinai, Muh. Altin
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.v1i1.166

Abstract

Perselingan batuan pada Formasi Tonasa dan Formasi Gunungapi Camba memunculkan batuan intrusi. Batuan intrusi tersebut muncul pada Formasi Tonasa. Sebaran batuan instrusi dan jenis batuan diidentifikasi dengan metoda Geolistrik konfigurasi Wenner-Schlumberger. Pengukuran terdiri dari 4 lintasan yang berarah baratlaut- tenggara dan 3 lintasan berarah baratdaya-timur laut. Setiap lintasan memiliki panjang bentangan 480 meter dan spasi antar elektroda 10 meter. Pengolahan data menggunakan perangkat lunak Res2Dinv untuk menghasilkan penampang 2D dan Voxler untuk mengasilkan 3D. Hasil analisis data diidentifikasi tersusun atas batugamping pasiran, lempung, zona lemah, aquifer, dan batuan intrusi yang merupakan batuan basal. Batuan intrusi memiliki nilai resistivitas yang tinggi daripada batuan disekitarnya dengan rentang nilai resistivitas 277-23842 Ωm dan terakumulasi di bagian tenggara lokasi penelitian serta sebaran berarah utara-tenggara.

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