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Al Rubaiyn
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jrgiuho@uho.ac.id
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Kantor Jurusan Teknik Geofisika, Gedung GKU Kampus Bumi Tridharma Anduonohu Kendari, 93132
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Kota kendari,
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INDONESIA
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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Survei Geohidrologi Menggunakan Metode Geolistrik Resistivitas di Wilayah Desa Mantobua Kecamatan Loghia Kabupaten Muna Al Firman; Jahidin; Usmardin; La Ode Andimbara; La Ode Sahiddin; Indrawati; Al Harun Taate
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.v8i01.193

Abstract

A geohydrological survey using the resistivity geoelectric method has been conducted in the Mantobua Village area, Loghia District, Muna Regency. This research aims to: (1) Determine the resistivity value of the subsurface layers, and (2) Determine the potential presence of groundwater based on the resistivity value of the subsurface layers. Data collection was carried out using 6 measurement lines with the Wenner-Schlumberger electrode configuration. The resistivity values of the subsurface layers in the research area range from 6.31 to 1757 Ωm. The potential presence of groundwater based on the resistivity values of the subsurface layers is as follows: Line 1 is below the surface at a depth of 9.26 m to 52.4 m with a resistivity range of 23.9 Ωm; Line 2 is at a depth of 6.59 m to 59.9 m with a resistivity of 13.2 – 26.5 Ωm; Line 4 is at a depth of 1.25 m to 59.9 m with a resistivity of 26.6 Ωm; Line 5 is at a depth of 1.25 m to 59.9 m with a resistivity of 16.3 – 32.6 Ωm; and Line 6 is at a depth of 9.26 m to 19.8 m with a resistivity of 60.4 Ωm.
Analisis Kinerja Komputasi Full Vectorization dan Nested Loop pada Forward Modeling Gravitasi Last–Kubik La Hamimu; Al Rubaiyn
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.v8i01.194

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
Studi Geofisika Terhadap Bidang Gelincir pada Daerah Rawan Longsor Menggunakan Metode Geolistrik Konfigurasi Wenner – Schlumberger di Desa Lamboo Kecamatan Moramo Kabupaten Konawe Selatan Syamsul Razak Haraty; Sadirga Karim; La Ode Andimbara
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.v8i01.195

Abstract

This study aims to identify the presence and depth of slip planes in landslide-prone areas in Lamboo Village, Moramo Subdistrict, South Konawe using the Wenner-Schlumberger configuration of the electrical resistivity method. The method involes injecting electric current into the ground and measuring the potential diffrerence to determine subsurface resistivity variations. Measurements were conducted along five survey lines to reveal subsurfaces  geological  structures  potentially  acting  as  landslide zones. The inversion results showed low resistivity zones interpreted as water-satured clay layers, which serve as slip planes. These slip zones vary in depth acroos the survey lines. The findings are crucial for landslide risk mitigation and can inform safer land-use planning for local communities

Page 5 of 5 | Total Record : 43

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