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Rahmiati
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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 8 Documents
 1 
Search results for , issue "Vol 4 No 1 (2021)" : 8 Documents clear
IDENTIFIKASI KEBERADAAN JALUR GOA BAWAH TANAH (BUNKER) BERDASARKAN ANALISIS DATA MAGNETIK DI DESA JEMBAYAN ., Suryadi; Supriyanto, Supriyanto; Djayus, Djayus
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.v4i1.721

Abstract

Existence of underground cave (bunker) in Jembayan has been known for long, but underground pathway was sealed and lost due to landslide. Goal of this research is to identify existence of underground cave (bunker) pathway based on magnetic data analysis. Topographic data acquisition with Theodolit and magnetic data acquisition with Geotron Model G5 Proton Memory Magnetometer at May 2nd 2019 with 98 observation point and space between observation point of 5 meters. Data processing carried out with diurnal variation corection, IGRF correction,. Upward continuation and reduce to pole. Modeling cared out by analyzing magnetic field anomaly that has been reduced to pole and upward continuation with 10 m height. Based on the analysis results and pathway cave magnetic data interpretation in Jembayan area shows existence of continuity from observation bunker and main bunker to north direction confirmed by higher magnetic field value between 230.1 to 2541 nT.
IDENTIFIKASI ZONA LEMAH DI JALAN POROS SAMARINDA BONTANG DENGAN MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI WENNER SCHLUMBERGER R, Achmad Fatoni; Supriyanto, Supriyanto
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.v4i1.677

Abstract

ABSTRACT Some road bodies in East Borneo experienced landslide and land-deformation that presumably caused by weak zones. Aim of this research is to investigate weak zones existence by means of geoelectricity method. This research utilizes secondary data of geoelectricity method Wenner-Schlumberger configuration. Weak zones existence caused landslide and land-deformation interpreted with Res2DinV modeling software. Result of this research showed weak zones located in all acquisition lines; in line 1 existed in 13 – 26 meters depth; in line 2 existed in 16 – 36 meters depth; in line 3 existed in 13 – 40 meters depth; and in line 4 existed in 10 – 28 meters depth. Commonly, rock composition of a weak zones is claystone with 20 – 30 Ωm resistivity value and sandy-claystone with 30 – 250 Ωm resistivity value. Key Words: Weak Zones, Land deformation, Resistivity, Wenner-Schlumberger.
INTERPRETASI KECEPATAN GELOMBANG GESER (VS) PADA LAPISAN BAWAH PERMUKAAN DAERAH ‘X’ DENGAN METODE SEISMIK MASW (MULTICHANNEL ANALYSIS OF SURFACE WAVE) Daud, Anye Gidalti; Lepong, Piter; Natalisanto, Adrianus Inu
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.v4i1.678

Abstract

ABSTRACT MASW or Multichannel Analysis of Surface Wave is a seismic method that utilizes the dispersive property of surface wave to interpret surface wave velocity which is directly related to the stiffness of a subsurface layer reaching 30 meters depth that beneficial in the geoengineering field. The goal of this research is to interpret shear wave velocity of subsurface layer in an area to inform the stiffness level of - subsurface layer through shear wave velocity and depth profiling. The steps of this research are converting seismic raw data into numeric data, generating dispersion image, extracting dispersion curve from dispersion image and analyzing dispersion curve by theoretical and experimental data. Based on analysis results, shear wave velocity obtained up to 170m/s with 16 meters investigation depth. Whereas fundamental mode frequency of Rayleigh wave between 2 – 12 Hz. Low shear wave velocity (<180 m/s) of investigated area indicates that the subsurface layer dominated with soft soil which is an early sediment in the shape of alluvium layer and has high seismic wave amplification that hazardous for building build upon the layer.
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.
Studi Penentuan Percepatan (Acceleration) Tanah Daerah Ampana, Balikpapapan, Bone, Bulukumba, Bau-Bau Akibat Gempabumi Donggala 28 September 2018 Ansyah, Habri; Djayus, Djayus; Supriyanto, Supriyanto
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.v4i1.611

Abstract

Ground acceleration that was caused by an earthquake can cause damage both physical and material. The research aims to determine the value of ground acceleration and the effects caused by earthquake. The data used was secondary earthquake data occurred at Donggala on September 28 th, 2018 at 17:02:45 WIB, with the observation area Ampana (central Sulawesi), Bau-Bau (South East Sulawesi), Bulukumba (South Sulawesi), Bone (South Sulawesi), and Balikpapan (Balikpapan). Research data including epicenter coordinates data, coordinates of observation area and the depth of earthquake. From this data are further calculated epicenter distance and hypocenter distance. Ground acceleration value was analyzed by using the method M. V Mickey, Esteva, Mc. Guirre RK, Donovan, Oliviera and Guttenberg then connected with MMI scale. The results showed thatthe ground acceleration value of Ampana, Balikpapan and Bone was between 0.0004 g – 0.0730 g with damage effects I-V according to MMI scale. For Bulukumba and Bau-Bau was between 0.0003 g– 0.0220 g with damage effects I-IV according to MMI Scale.
Analysis of Scale Distance Correlation to Soil Vibration in Coal Blasting Operations Julianti, Sri Rezeki; Djayus, Djayus; Lepong, Piter
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.v4i1.740

Abstract

The optimum vibrations generated from the delay, distance, and explosive settings on the destruction of the ground cover or OB can accumulate the effect of the damage. Research was purposed to view the process of coal blasting and the impact of distance and explosives the detonation process. The data used in the research is a secondary force of distance, explosives, drilling patterm (7 m burden and 8 m distance ) and blasting pattern (Staggered patten/Zig-zag).Data are prepared using Microsoft Excel by inserting distance and explosives materials and for PPV value. PPV value is compared with the distance value (scaled distance). The result of research shows the process of blasting using a zig-zag system with distance between 7m and spacing 8m, depth of 3m - 14m. Explosived material content (ANFO) with averaged 101.74. The impact of the distance and the explosives materials from PPV calculations is not very significantly indicated by the PPV value of 3,62mm/s.
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
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.

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