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Jurnal Rekayasa Geofisika Indonesia
Published by Universitas Halu Oleo
ISSN : 26858657     EISSN : 26858649     DOI : https://doi.org/10.56099/jrgi
Core Subject : Science, Engineering,
Computer Science & IT Earth & Planetary Sciences Engineering Physics
JRGI (Jurnal Rekayasa Geofisika Indonesia) merupakan jurnal ilmiah yang memuat hasil-hasil penelitian yang mencakup kajian teoretik, simulasi dan modeling, eksperimen, rekayasa dan eksplorasi dalam bidang Geofisika dan Aplikasinya. Bidang-bidang yang masuk dalam ruang lungkup jurnal ini adalah: Rekayasa Geofisika Seismologi Geofisika Perminyakan Fisika Teori Geofisika Komputasi Geofisika Instrumentasi Fisika Material Oseaografi Meteorologi (Fisika Atmosfer)
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geofisika
Articles 43 Documents
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Estimasi Sistem Perlapisan pada Blok-A Area Panas Bumi Lainea Konawe Selatan Menggunakan Vertical Electrical Sounding (Ves) Konfigurasi Schlumberger Syafira Mpuhu; Jamhir Safani; Syamsul Razak Haraty
Jurnal Rekayasa Geofisika Indonesia Vol. 7 No. 02 (2025): Edisi Agustus JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v7i02.19

Abstract

This research aims to estimate the layering system in the Lainea Geothermal area in South Konawe Regency. The apparent resistivity data obtained from the Pusat Sumber Daya Geologi (PSDG) measured in 2010 using the Schlumberger configuration was inversed with the particle swarm optimization (PSO) method. From the results of data inversion at both sounding points, it was found that there are five layers with different resistivity ranges. The first layer is a thin overburden near the surface with a thickness of 0.5 - 0.7m. The second layer is thought to be conglomerate rock. The third layer is interpreted as cap-rock with meta-sandstone lithology with a resistivity value range of 126.3<ρ<366 Ωm. The fourth layer with sandstone lithology is closely suspected as a fluid accumulation zone with a resistivity value range of 45.4<ρ<69 Ωm. The lowest layer with a resistivity value range of 261<ρ<500 Ωm is interpreted as metamorphic rock which is thought to act as an impermeable layer.
Analisis Energi Angin Sebagai Pembangkit Energi Listrik di Kecamatan Wawonii Utara La Ode Sukirman; Irawati; Syamsul Razak Haraty
Jurnal Rekayasa Geofisika Indonesia Vol. 7 No. 02 (2025): Edisi Agustus JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v7i02.25

Abstract

Research has been carried out to determine the potential for wind energy in North Wawonii dictrict konawe island regency. Research methods include collecting wind speed data and calculating wind energy potential. Wind speed was measured using a Benetech GM816 digital Anemometer from 16 to 21 June 2023 for 9 hours per day, then a wind distribution map was made using Surfer 13 software to determine the distribution of wind direction. The results of the analysis of the average potential wind speed in six days in North Wawonii district range from 2.06 m/s to 5.98 m/s with an average of 3.63 m/s and the resulting power (cp) of 22.34 watts to 33.18 watts with an average of 27.91Watts and Effective Power (Ea) ranges from 11.29 watts to 16.91 watts with an average of 14.22 watts. Based on the results of the analysis of minimum, maximum and average wind speeds in coastal areas and mountainous areas in the North Wawonii area over a period of six days, it can be concluded that the wind speeds that occur have the potential to be utilized because they are classified as class 4 wind speed criteria on the Beaufort scale..
Analisis Geoteknik untuk Mengurangi Potensi Bencana Longsor di Area Tambang Nikel, Kecamatan Langgikima Muhammad Ilham Kadar Ilham; La Ode Andimbara; Al Rubaiyn; La Ode Dzakir; Muh Karnoha Amir
Jurnal Rekayasa Geofisika Indonesia Vol. 7 No. 02 (2025): Edisi Agustus JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v7i02.163

Abstract

Landslides that commonly occur in nickel mining are caused by the absence of geotechnical studies conducted by the company. Based on the importance of this issue, this study was carried out to mitigate potential landslides in the mining slope area. The objective of this research is to determine the physical and mechanical characteristics of laterite soil, recommend a stable slope design, and establish an optimal factor of safety for practical implementation. The results of this study indicate that the soil material in the limonite zone has a density of 12.65 kN/m³, cohesion of 22.55 kN/m², and an internal shear angle of 30.58˚, while the soil material in the saprolite zone has a density of 12.55 kN/m³, cohesion of 12.75 kN/m², and an internal shear angle of 28.34 ˚. The recommended overall slope design to ensure slope stability and prevent landslides includes a slope height of ≤ 45 m, a bench width of ≥ 60 m, and an overall slope angle of ≤ 37º. Additionally, the recommended factor of safety for overall slope stability is ≥ 1.1, with a landslide probability of 7.80%
Identifikasi Litologi Bawah Permukaan Dalam Menentukan Lapisan Keras Menggunakan Metode Geolistrik di Desa Rejomulyo, Lampung Selatan Rhahmi Adni Pesma; Muhamad Raja Saffath
Jurnal Rekayasa Geofisika Indonesia Vol. 7 No. 02 (2025): Edisi Agustus JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v7i02.171

Abstract

Measurements have been conducted using the Schlumberger configuration Vertical Electrical Sounding (VES) geoelectric method in Rejomulyo Village, South Lampung. This study aims to identify subsurface lithology in determining rocks resembling hard rocks using VES geoelectric data. Primary data collection using Naniura with 6 Vertical Electrical Sounding (VES) points. Each sounding point has an AB/2 length of 150 meters and a MN/2 spacing of 0.5 meters to 10 meters. The distance between VES points is 75-150 m. Data processing in the study used IPI2WIN+IP software. 2D model creation used Surfer software. The types of subsurface rocks found were Tuff Clay, tuff sand, coarse-grained tuff and fine-grained tuff. Then the rock that resembles a hard layer is tuff rock with fine and compact grains with a resistivity value of more than 300 Ωm, namely 323 - 529 Ωm at a depth of 25.6 - 36.6 m, but at the VES 6 point, no layer resembling a hard layer was detected due to the low resistivity value measured at the VES 6 point, namely 228.7 Ωm.
Analisis Percepatan Tanah Maksimum (PGA) dan Intensitas Skala Mercalli Menggunakan Data Mikrotremor dan Data Gempabumi di Wilayah Pesisir Kecamatan Moramo La Hamimu; Laode Ihksan Juarzan; Sugi Astira
Jurnal Rekayasa Geofisika Indonesia Vol. 7 No. 03 (2025): Edisi Desember JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v7i03.28

Abstract

Research has been carried out in the Coastal area of Moramo District, South Konawe Regency. This study aims to determine the distribution of values for the dominant period , Peak ground acceleration (PGA), and seismic intensity based on the MMI scale using earthquake data that occurred in Southeast Sulawesi over a period of 30 years from 1993 to 2023 to be exact. Microtremor data were analyzed using the HVSR method with geopsy software to obtain the dominant frequency value , which then determines the dominant period value to obtain the peak ground acceleration (PGA) value so that the seismic intensity value can be determined. The dominant period values obtained ranged from 0,07 to 0,99 s while the surface PGA values obtained ranged from 35,32 to 149,29 gal and the basement PGA ranged from 30,23 to 44,92 gal. The seismic intensity values obtained ranged from 3,44 to 4,35 SR. The seismic intensity values is then classified in the form of a distribution map. The seismic intensity distribution map shows that the Coastal area of Moramo District, South Konawe Regency has a relatively low level of seismic intensity.
Identifikasi Sistem Perlapisan Blok – B Area Panas Bumi Lainea Konawe Selatan Menggunakan Metode Vertical Electrical Sounding (Ves) Konfigurasi Schlumberger Annisa Tiara Saputri; Jamhir Safani; Syamsul Razak Haraty
Jurnal Rekayasa Geofisika Indonesia Vol. 8 No. 01 (2026): Edisi April JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v8i01.20

Abstract

Gravity forward modeling based on the Last–Kubik kernel requires intensive computation as the number of model blocks and observation points increases. This study analyzes the computational performance of Full Vectorization (FV) compared with Nested Loop (NL) without modifying the mathematical formulation of the Last–Kubik kernel. Experiments were conducted using synthetic models with 20 configurations ranging from 20,000 to 168,200 blocks. Algorithm performance was evaluated based on gravity-response consistency, computational time, and memory usage. Computational time was assessed using Total Execution Time (TET) and Mean Core Computational Time (MCCT) from 30 repetitions, while memory usage was evaluated using Kernel Workspace Memory Increase (KWMI). The results show that the FV and NL implementations produce numerically identical gravity responses, with a maximum absolute difference of 0 for the tested configurations. FV provides an MCCT speedup of approximately 6–7 times for small to medium-sized models, but the speedup decreases to 1.56 times at 168,200 blocks. In contrast, FV requires approximately 18 times more memory than NL. Regression analysis shows a very strong linear relationship between KWMI and the number of observation–block pairs. The results demonstrate that FV effectively accelerates gravity forward modeling but has scalability limitations due to its substantially higher memory requirements
Identifikasi Potensi Gerakan Tanah Berdasarkan Analisis Ground Shear Strain (GSS) Data Mikrotremor dan Data Gempa Bumi di Daerah Perbukitan Kecamatan Moramo Fitri Silma Filardini; La Hamimu; Laode Ihksan Juarzan
Jurnal Rekayasa Geofisika Indonesia Vol. 7 No. 03 (2025): Edisi Desember JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v7i03.23

Abstract

Abstract. Research has been conducted in the hilly area of Moramo District, South Konawe Regency. This study aims to determine the distribution of GSS values and determine the potential for ground motion that occurs based on GSS parameters. Microtremor data were analyzed using the HVSR method using Geopsy 3.4.2 software to determine the dominant frequency value and amplification value obtained from the H/V curve. Then the Seismic Vulnerability Index and PGA values were calculated. The Seismic Vulnerability Index value together with the PGA value is used to obtain the GSS value. Based on the research results, the distribution of GSS values in the hilly area of Moramo District ranges from to . The potential ground motion that may occur in the hilly area of Moramo District consists of 2 phenomena, specifically vibration and cracking or ground movement. Areas with vibration phenomena are located south of Lamboo village, north and east of Pudaria Jaya village, north of Watu Porambaa village, south and west of Sumber Sari village, and east of Ulusena village, while areas with cracking or ground movement phenomena are located south of Pudaria Jaya village, north of Watu Porambaa village, most of Wonua Jaya village and Sumber Sari village, south of Bisikori village, and most of west of Ulusena village. In the study area, soil dynamics are only elastic and elasto-plastic.
Identifikasi Keterdapatan Lapisan Air Tanah Berdasarkan Data Resistivitas Listrik pada Blok Utara Area Penambangan PT. LIPS desa Lambo Kecamatan Moramo–Konawe Selatan I Komang Agus Saputra; Jahidin; Hasan Erzam S
Jurnal Rekayasa Geofisika Indonesia Vol. 7 No. 03 (2025): Edisi Desember JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v7i03.59

Abstract

A study has been conducted to identify the 2D distribution of groundwater layers based on electrical resistivity data in the North Block of PT LIPS Mining Area, Lambo Village, Moramo District, South Konawe. The data used is secondary data in the form of geoelectric data with the Wenner-Schlumberger configuration totaling 8 passes with a length of 310 m. Processing used Res2DInv software to produce subsurface resistivity in the form of 2D cross sections. Based on the results of the 2D resistivity cross section interpretation, the depth of groundwater in track 1 is 16-25 m, track 2 is 18,8-48,0 m, track 3 is 12,8-30,0 m, track 4 is 12,8-24,9 m, track 5 is 15-26 m, track 6 is 12,8-30,0 m, track 7 is 12,8-28,0 m and track 8 is 19-35 m.
Estimasi Model 3D Antar-Muka Basement Kawasan Panas Bumi Lainea-Konawe Selatan Berdasarkan Anomali Medan GravitASI Data GGMPLUS Andre Nico Carli Silalahi; Jamhir Safani; Al Rubaiyn
Jurnal Rekayasa Geofisika Indonesia Vol. 7 No. 03 (2025): Edisi Desember JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v7i03.63

Abstract

This research was conducted in the South Konawe area, especially in other geothermal using satellite image data, namely the Global Gravity Model Plus (GGMPlus) which has been developed with high resolution and a distance between points of -220m. Several studies have been conducted basement 3D modeling using measurement data but have not found basement 3D modeling in the Lainea area based on GGmplus data.Gravity data modeling (residual anomaly) was inverted using the GRAV_D_In-based MATLAB program. The Grav_D_In program requires several parameters, namely anomaly depth estimation, area area, wavenumber range for low-pass filters, density contrast, and widowing. The result of the inversion of the basement interface 3D model has a depth ranging from 980m to 1540m. The results of the basement contour pattern overlay with the structural pattern show that the structural pattern partially follows the basement contour pattern. An overlay of the basement model of the study was carried out using field data in the topography, that the basement model intersected in the use of satellite image data with measurements. The second basement pattern intersects but has different depths
Analisis Akumulasi Logam Berat pada Sedimen Pesisir Teluk Lasolo Berdasarkan Suseptibilitas Magnetik Irawati; Alfathanah; Erzam S Hasan
Jurnal Rekayasa Geofisika Indonesia Vol. 8 No. 01 (2026): Edisi April JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v8i01.113

Abstract

This research was conducted in Lasolo Bay, specifically in Mandiodo Village, Molawe District, North Konawe Regency. The aim of the study was to determine the magnetic susceptibility values, heavy metal concentrations, and assess the sediment quality. Magnetic susceptibility measurements and X-Ray Fluorescence (XRF) tests were carried out to obtain the required data. The results showed that the magnetic susceptibility values ranged from 4.5 × 10^(-8) m³/kg to 27.3 × 10^(-8) m³/kg. Based on the XRF measurements, the heavy metals with the highest concentrations detected were Nickel (Ni), Iron (Fe), and Cobalt (Co), while Copper (Cu) and Zinc (Zn) did not exceed the maximum permissible limits. According to the Pollution Load Index (PLI) analysis, the sediment quality is categorized as polluted, with the geoaccumulation index indicating pollution levels ranging from unpolluted to severely polluted.

Page 4 of 5 | Total Record : 43

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