cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Rahmiati
Contact Email
rahmiati@fmipa.unmul.ac.id
Phone
+6281355258687
Journal Mail Official
kutaibasin@fmipa.unmul.ac.id
Editorial Address
Jalan Barong Tongkok No.4 Gunung Kelua Samarinda, East Kalimantan Province Indonesia - 75123
Location
Kota samarinda,
Kalimantan timur
INDONESIA
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
 6   7   8   9   10 
INTERPRETASI KEDALAMAN DAN KETEBALAN LAPISAN BATUBARA DENGAN MENGGUNAKAN METODE WELL LOGGING DI PT LAMINDO INTER MULTIKON SITE BUNYU Sunarti, Sunarti; Supriyanto, Supriyanto; 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.v3i2.694

Abstract

The purpose of this study was to determine the depth and thickness of coal seams based on gamma ray log and log density. Interpretation of DPG01 drill point at a depth of 45.15 - 58.65 m there is coal with a thickness of 13.5 m, at a DPG04 drill point depth of 30.45 - 43.40 m there is coal with a thickness of 12.95 m, DPE04 drill point a depth of 23.00 - 36.10 m there is coal A with a thickness of 13.1 m, at depth 86.20 - 96.78 m there is coal B with a thickness of 10.58 m, DPE06 drill point depth 34.57 - 44.15 m there is coal A with a thickness of 9.58 m, at a depth of 86.15 - 92.33 m there is coal B with a thickness of 6.18 m, at 100.24 - 105.05 m there is coal C with a thickness of 4.81 m and a drill point DPE07 depth of 49.74 - 65.20 m there is coal A with a thickness of 15.46 m. The results of these interpretations produce an average on each coal seam. In seam A has an average thickness of 12.91 m, seam B has an average thickness of 8.38 m and seam C has a thickness of 4.81 m.
IDENTIFIKASI ZONA LEMAH BIDANG GELINCIR MENGGUNAKAN METODE SEISMIK REFRAKSI TOMOGRAFI Hasani, Ruslan; Lepong, Piter
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.v1i2.286

Abstract

This research was performed the identifity the lithology of weak zone as a surface of the landslide based on seismic velocity of seismic refraction tomography. The research was conducted on the main road of Tenggarong-Kutai Barat and also on the road of Samarinda-Tenggarong, in Kalimantan Timur. Data acquisition was conducted in one line travel with nine shot point in the same interval. This method used the picking first break of the seismic trace. This travel time as send input data of the Rayfract software of processing of seismic refraction tomography. The processed data shown the image of the seismic velocity of subsurface. The slip surface is interpretated from the boundry of sandstone and clay with velocity of (400 m/s - 1000 m/s) and of (1000 m/s -2500 m/s) respective. The identification on each revealed the types of rock in the study area.
A Study of Rayleigh Waves for Predicting Soil Carrying Capacity Using the Seismik Multi-Channel Analysis Of Surface Wave (MASW) Method Laila, Nor; Munir, Rahmiati; Lepong, Piter
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.v6i1.1070

Abstract

This research was conducted to determine subsurface lithology and soil carrying capacity in the study area by using the results of shear wave analysis using the MASW seismik method. This study used secondary seismic refraction data with three lines, where the data was collected on street Poros Samarinda-Tenggarong, East Kalimantan. Data processing is divided into two stages, namely the determination of the dispersion and inversion curves to produce shear wave velocity values. The resulting shear wave value is used to analyze the soil bearing capacity. The results of this study are that there is sandstone material (unsaturated) in the first layer and clay rock and at that location has a soil permit carrying capacity value range of 74.46-79.8 KPa with a moderate soil type class.
Aplikasi Metode Geolistrik Resistivitas untuk Pendugaan Struktur Batuan serta Keberadaan Air Tanah (Studi Kasus Sulamu Kecamatan Sulamu Kabupaten Kupang) Wahid, Abdul
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.v1i1.164

Abstract

Telah dilakukan penelitian Geolistrik Resistivitas di Kelurahan Sulamu, Kecamatan Sulamu, Kabupaten Kupang yang bertujuan untuk menduga struktur perlapisan batuan dan mengidentifikasi potensi air tanah berdasarkan nilai resitivitas. Metode yang dilakukan adalah geolistrik resistivitas konfigurasi Sclumberger serta proses pengolahan data digunakan software Res2dinv. Nilai resitivitas batuan berbeda-beda antara 0,541 Ωm - 14711 Ωm. pengukuran lintasan Sulamu I mempunyai resistivitas berkisar dari 0,541 Ωm sampai 14,711 Ωm, pengukuran lintasan Sulamu II mempunyai resistivitas berkisar dari 1,52Ωm sampai 1883 Ωm, pengukuran lintasan Sulamu III mempunyai resistivitas berkisar dari 2,59 Ωm sampai 575 Ωm, pengukuran lintasan Sulamu IV mempunyai resistivitas berkisar dari 1,64 Ωm sampai 4560 Ωm. Jenis batuannya adalah batuan aluvium dan batuan gamping. Batuan aluvium mempunyai resistivitas berkisar dari 0,541 Ωm sampai 185 Ωm dengan ketebalan berkisar dari 1,25 m sampai 36,9 m dan batuan gamping mempunyai resistivitas berkisar 190 Ωm sampai 14771 Ωm dengan ketebalan berkisar dari 1,25 m sampai 36,9 m.
Strategi Adaptasi Perubahan Iklim Melalui Pemanfaatan Air Hujan Untuk Penyediaan Air Bersih Di Kota Tarakan-Kalimantan Utara mislan, Mislan; Partimin, Partimin
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.v5i2.991

Abstract

Perubahan iklim diyakini sangat berdampak terhadap ketahanan air di perkotaan. Dampak tersebut diantaranya ditunjukkan adanya perubahan pola curah hujan dan anomali iklim, selanjutnya dampak tersebut berpengaruh terhadap ketersediaan air baik secara kuantitas maupun kualitas, serta meningkatnya daya rusak air. Kota Tarakan memiliki luas 655,77 km2 merupakan pulau kecil yang rentan terhadap perubahan iklim. Kerentanan perubahan iklim tersebut mencakup terbatasnya penyediaan air bersih, kejadian banjir dan longsor dan meningkatnya kenaikan muka air laut. Dengan curah hujan tahunan rata-rata sebesar 3.898,2 mm maka tebal curah hujan yang diperoleh dalam 1 hari sebesar 145 lt. Dalam 1 tahun dengan jumlah rumah tangga 52.602, volume air yang dapat ditampung mencapai 2.782.600 m3 atau bernilai sekitar Rp. 3.338.400.000 sampai Rp. 19.478.200.000. Untuk mengembalikan pembelian dan pemasangan drum/tanki bagi 52.602 rumah tangga diperlukan investasi senilai Rp. 84.163.200.000,- atau diperlukan kembali modal antara 4,32 sampai 25 tahun. Pemanfaatan air hujan sangat cocok untuk dipilih karena tidak memerlukan teknologi yang tinggi, masyarakat sudah sangat familiar dan curah hujan di Tarakan sangat tinggi. Pemanfaatan air hujan diyakini akan meningkatkan ketahanan air melalui meningkatnya ketersediaan air bersih dan berkurangnya air limpasan (yang selanjutnya mengurangi kejadian dan intensitas banjir), serta penghematan terhadap pengeluaran biaya pemanfaatan air oleh masyarakat. Pemanfatan air hujan harus dimasyarakatkan dan dapat ditempuh melalui penetapan kebijakan pemanenan air hujan, sosialisasi, pendampingan, pembentukan komunitas, dan pemberian insentif serta kajian teknologi pemanfaatan air hujan yang ekonomis dan teknologi yang sederhana.
PENENTUAN TITIK EPICENTER DAN HYPOCENTER SERTA PARAMETER MAGNITUDE GEMPABUMI BERDASARKAN DATA SEISMOGRAM Bulo, Deni; Djayus, Djayus; Supriyanto, Supriyanto
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.v3i1.597

Abstract

Provinsi Banten merupakan daerah yang dekat dengan zona pertemuan dua lempeng atau biasa disebut dengan zona konvergen. Di selatan provinsi Banten terdapat pertemuan lempeng benua dengan lempeng samudera yaitu lempeng Eurasia yang menunjam lempeng Indo-Australia. Oleh karena itu daerah pulau Jawa bagian selatan rawan akan terjadinya gempa yang disebabkan oleh gesekan antara dua lempeng tersebut. Dalam penelitian ini dilakukan kajian lokasi titik epicenter dan hypocenter gempa serta parameter magnitude gempa Lebak Banten 23 Januari 2018 dengan origin time adalah 06:34:55 UTC. Pada penentuan lokasi titik epicenter digunakan hukum Laska dengan menggunakan data awal tiba gelombang P dan gelombang S pada stasiun-stasiun geofisika yang terdekat dengan pusat gempa sedangkan untuk mengetahui lokasi hypocenter atau pusat gempa digunakan metode Geiger untuk mengetahui kedalaman pusat gempa tersebut sama dengan menentukan lokasi epicenter dalam menentukan lokasi hypocenter digunakan data awal tiba gelombang P dan gelombang S pada stasiun-stasiun geofisika yang terdekat dengan pusat gempa. Mengetahui berapa besar kekuatan gempa maka digunakan persamaan empiris tiap parameter magnitude yaitu Magnitude Lokal, Broad-band Body Wave Magnitude, Magnitude Permukaan dan Magnitude Momen. Hasil dari penentuan lokasi epicenter menggunakan hukum Laska diketahui bahwa gempa tersebut berada pada koordinat Latitude -7.09 LS dan Longitude 106.03 BT sedangkan dengan menggunakan metode Geiger diketahui pusat gempa berada pada kedalaman 40 Km bumi. Masing-masing parameter magnitude diketahui Magnitude Lokal sebesar 5,22 MLv, Broad-band Body Wave Magnitude sebesar 5,42 mB, Magnitude Permukaan sebesar 5,75 Ms dan Magnitude Momen 5,71 Mw. Dengan demikiaan gempa Lebak Banten 23 Januari dikategorikan sebagai gempa dangkal oleh letak pusat gempanya dan gempa sedang (Moderate Earthquake) oleh kekuatan magnitudo gempanya.
Studi karakteristik Sedimen di Estuari Delta Mahakam Kalimantan Timur Anggara, Geogy; Mandang, Idris; Munir, Rahmiati
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.v4i1.460

Abstract

The Mahakam Delta has complex characteristics. It has river branches to connect directly in the Makassar Strait. River discharge carries sediments from upstream to the high-salinity water in Estuary which causes mixing. The purposes of this study are to determine the characteristics of sediments and to know the pattern of sediment distribution in the Estuary of Mahakam Delta. The value of the manual processing of sediments become the initial value in modeling the pattern of sediment distribution using ECOMSED model. The model is run for 40 days (07 July - 16 August 2019). Discharge and tidal also use in the running data. The results of manual processing show the characteristics of muddy sediments with an average of 0.002 mm. The simulation results show that the pattern of sediment distribution carried by surface currents. The highest of sediment concentration when the high tide is on the Estuary and on offshore when the low tide. Keywords: The Mahakam Delta, Sediment, Distribution pattern, Sediment Characteristics
STUDI MEKANISME SUMBER GEMPABUMI DI WILAYAH KALIMANTAN BERDASARKAN GERAK AWAL GELOMBANG P Rusmilawati, Depi; Djayus, Djayus; Lepong, Piter
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.v2i2.470

Abstract

Pulau Kalimantan selama ini dikenal sebagai pulau yang relatif aman dari gempa bumi. Tujuan penelitian ini adalah Mengetahui mekanisme sumber gempabumi dengan menggunakan data gerak awal dari gelombang P dan mencari penyebab dari kejadian gempabumi di wilayah Kalimantan tahun 2015-2018. Dilakukan pengolahan data menggunakan program fokal mekanisme dengan memilih data gempa bumi yang mempunyai magnitude ≥ 4 Skala Ricther (SR). Penelitian ini menggunakan metode gerak awal gelombang P dengan penentuan polaritas gelombang yang berupa gelombang naik (kompresi) dan gelombang turun (dilatasi). Dari hasil analisis fokal mekanisme gempabumi Kalimantan 2015-2018 diperoleh nilai parameter orientasi bidang sesar berupa strike, dip dan rake. Untuk strike di Kalimantan bagian Utara 114- 170, Dip 80-90 dan Rake -2 – (-136). Sedangkan di Kalimantan Timur, Strike 158- 174, Dip 85-89 dan Rake 2-179. Kalimantan Selatan dengan Strike 127- 159, Dip 40-47 dan Rake 88-97. Hasil penelitian ini menunjukan bahwa penyebab gempa Kalimantan bagian Utara secara umum berupa sesar oblique dan Sesar geser (strike slip). Sedangkan Kalimantan bagian Timur merupakan sesar geser (strike slip) serta Kalimantan bagian Selatan berupa sesar naik (reverse fault) dan Sesar oblique (oblique reverse fault).
IDENTIFIKASI ZONA PROSPEK RESERVOAR BERDASARKAN DATA SEISMIK PADA LAPANGAN BOONSVILLE FORT WORTH BASIN TEXAS UNITED STATES OF AMERICA Musyaffa, Nur Rafif; Mandang, Idris; Rahmiati, Rahmiati
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.v4i1.690

Abstract

The aim of the research is to identify reservoir prospect zone in Caddo and Vineyard zone at Boonsville field, Fort Worth Basin, Texas, United States of America. In this research used 3D PSTM (Post Stack Time Migration) reflection seismic data and BY18D borehole data. Data processing of seismic inversion obtained Acoustic Impedance (AI) value. Well logging data obtained effective porosity (PHIE) value. From analysis, the results of reservoir zonation obtained on Caddo and Vineyard zone. Distribution of reservoir prospect zone in BY18D can be seen from depth marker data in 4735-5740 feet depth. After zonation process was conducted, effective porosity value (PHIE) was obtained. Analysis from well logging In Caddo zone, 12% porosity value obtained in 4735-4830 feet depth. In Vineyard zone, 13% porosity value obtained in 5647-5740 feet depth. The Results of the study is obtained effective porosity (PHIE) with moderate value. Afterward, in seismic inversion data processing, range of Acoustic Impedance value was obtained. In Caddo zone, the range is 37500-42500 (m/s)*(gr/cc). In Vineyard zone, the range is 35000-42500(m/s)*(gr/cc). The results describe high value of acoustic impedance seismic analysis results, it shows the high acoustic impedance value distribution, that indicated a moderate effective porosity (PHIE) value distribution.
PERUBAHAN PENUTUPAN LAHAN BERDASARKAN ANALISIS CITRA DIGITAL DI DAERAH ALIRAN SUNGAI MAHAKAM Prasetyo, Mohammad Aji; Mandang, Idris; Mubarrok, Saat
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.v2i1.335

Abstract

This study aims to analyze the land cover in the Mahakam watershed, East Kalimantan in years of 2003 and 2015 by using data satellite LANDSAT ETM+ image and LANDSAT OLI / TIRS with spatial resolution 30 m. The method used is the initial processing of the image, visual image interpretation, field observations, the determination of sample area, supervised classification using the maximum likelihood method, analysis of accuracy test, reclassification, and analysis of land cover change. Land cover of Mahakam watershed can be classified into 5 type of land cover, namely vegetation, fishpond, settlements, open land and watershed. In 2003, the vegetation area in the Mahakam watershed reached 1.135.629 ha and up to 1.139.318 ha or about 0,53 % in 2015. At the same time, the class of settlement increased from 11.823 ha in 2003 to 79.303 ha in 2015. The land cover of watershed also increased by 6,78 %, from 110.969 ha increasing to 222.560 ha. Open land area has decreased of around 9,77 % or 160.807 ha converted to watershed, vegetation, and settlement.Type of land cover mining has decreased in the period 2003-2015, amounting to 29.177 ha or 1,77 %. Which is converted to vegetation and open land. It shows that land cover change in Mahakam watershed is dominated by open land that is used by the community as settlements, plantations and others.

Page 8 of 11 | Total Record : 108

 6   7   8   9   10 

Filter by Year

2018 2025


Reset
Filter By Issues
All Issue Vol. 8 No. 2 (2025) Vol. 8 No. 1 (2025) Vol. 7 No. 2 (2024) Vol. 7 No. 1 (2024) Vol. 6 No. 2 (2023) Vol 6 No 1 (2023) Vol 5 No 2 (2022) Vol 5 No 1 (2022) Vol 4 No 2 (2021) Vol 4 No 1 (2021) Vol 3 No 2 (2020) Vol 3 No 1 (2020) Vol 2 No 2 (2019) Vol 2 No 1 (2019) Vol 1 No 2 (2018) Vol. 1 No. 1 (2018) More Issue