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Al Rubaiyn
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Kantor Jurusan Teknik Geofisika, Gedung GKU Kampus Bumi Tridharma Anduonohu Kendari, 93132
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Kota kendari,
Sulawesi tenggara
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 30 Documents
 1   2   3 
Analisis Kualitas Air Tanah pada Daerah Sekitar Lokasi Pertambangan di Kabupaten Kolaka Ali Okto; Al Rubaiyn; Jahidin; La Ode Sahiddin; La ode Andimbara; Suryawan Asfar
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 01 (2023): Edisi April Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i01.1

Abstract

This research was conducted around mining sites is Pomalaa district, Kolaka. Nickel mining activities have an impact on water pollution which can reduce water quality in both rivers and groundwater. The decrease in water quality around the mining area can be caused by the flow of runoff from rainwater which carries soil particles to water bodies which makes the water cloudy and may contain heavy metals. This study aims to determine the quality of the soil around the mining area of ​​Pomalaa District. Sampling of surface water and subsurface water was carried out using the purposive sampling method. The Pollution Index method is used to analyze the level of water pollution. The results of the analysis show that mining activities in the study area do not have a significant impact on decreasing air quality even though some hazardous metal elements are found such as Arsenic (Ar), Khomium VI (Cr+6), Iron , Cadmium, Copper (Cu) and Lead (Pb). The dominant influence is the high content of BOD and DO in the waters which makes several locations of minor occurrences according to the calculation of indexing calculations. Geological factors that play a role in decreasing air quality are morphological, lithological and structura
Magnetic Characteristics of Soil in Cocoa and Cashew Production Fields Using the Magnetic Susceptibility Method Arisona A.
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 01 (2023): Edisi April Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i01.3

Abstract

Soil magnetic characteristics on land under stands of cacao and cashew trees were carried out by varying the depth. This soil magnetic determination uses the magnetic susceptibility method. The results indicated that the magnetic characteristics of the soil under tree stands depended on the frequency ( ) and the frequency-dependent susceptibility value ( with an increase towards the top of the soil profile in cocoa and cashew trees. This condition causes the formation of higher minerals as a result of changes in the size of the smaller grains that increase towards the upper horizon. The measured magnetic susceptibility value shows that the soil magnetic characteristics of the two tree species are Paramagnetic. The difference in magnetic susceptibility values ​​which tend to be high indicates that the contribution of superparamagnetic minerals is the result of the pedogenesis process
IDENTIFIKASI PROSPEK HIDROKARBON MENGGUNAKAN METODE INVERSI SIMULTAN PADA LAPANGAN TEAPOT DOME, WYOMING Ida Herawati; Muhammad Ilham Al Haj
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 02 (2023): Edisi Agustus Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i02.4

Abstract

First Wall Creek and Second Wall Creek is reservoir interval at Teapot Dome Field, Wyoming, USA To determine lithology and fluid type distribution in this formation, this study conducts seismic attributes mapping using inversion process. Simultaneous inversion is applied to angle gather data to obtain seismic attribute values for First Wall Creek (F1WC) and Second Wall Creek (F2WC) reservoirs. Cross-plot analysis shows that P-Impedance, Vp/Vs ratio, lambda-rho and mu-rho attributes can distinguish reservoir zone from non-reservoir zone. Simultaneous inversion results are P-Impedance, S-Impedance, and density volume, therefore LMR (Lambda-Mu-Rho) attributes calculation is needed. From cross-plot analysis and inversion results, lithology and fluid distribution are interpreted. For F1WC reservoir zone, lambda-rho <32.2 Gpa*g/cc indicate sandstone areas with Vp/Vs Ratio <1.77 indicate brine inclusions. For F2WC zone, lambda-rho <33 Gpa*g/cc indicate sandstone area and oil-inclusion area is indicated by P-Impedance <30000 ft/s*g/cc and Vp/Vs Ratio <1.8. From attributes maps, oil reservoir in F2WC zone is possible accumulated at northwest part of study area.
The Efektivitas Metode Peter Half Slope dalam Menentukan Kedalaman Benda Anomali Syamsurijal Rasimeng; Ivana Jayarani; Maria Nova NafTalita; Tiara Andika Fadila; Ilham Dani; Rustadi
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 03 (2023): Edisi Desember Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i03.7

Abstract

The Peter Half Slope method is one of several techniques that can be used as the earliest quantitative depth determination. It is hoped that through this research the literature on the Peter Half Slope method can increase. This research aim is to prove the effectiveness of the Peter Half Slope method in estimating the depth of subsurface anomalous objects through comparison of models (synthesis) that have not and have been added random values as error values. This research begins with modeling in Geomodel software. After obtaining the appropriate synthetic modeling results, the next step is to perform processing in Matlab software to test the effectiveness of the Peter Half Slope method. After entering all the values, the average value of the anomalous depth of model 1 in d1, d2, and d3 is 100.1890m. As for model 2, the average value of model 2 anomaly depth is 97.35344m. The error between the original modeling and the modeling added random values using the Peter Half Slope method is 2.83%. Thus, this method is considered effective in determining the depth of subsurface anomalies through magnetic response, but to determine the exact depth requires the use of other methods as the main method.
Implementasi Komputasi Travel Time Seismik Refraksi Anisotropi dengan Metode Pseudo Bending La Hamimu Hamimu
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 02 (2023): Edisi Agustus Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i02.11

Abstract

Numerical modelling of ray tracing from seismic refraction involving pseudo bending method and anisotropic attribute can be a new approach in understanding the wave propagation and calculating the travel time. The ray tracing of seismic refraction using the pseudo bending method provide a distinctive path for low and high velocity anomalous. The simulation result presented that travel time calculation for low velocity anomaly is greater than those of high velocity anomaly. Based on the type of media, ray tracing pattern and travel time calculations using the pseudo bending method also provided the different paths and travel time values for isotropic and anisotropic media. In an isotropic medium, ray tracing and travel time for direct shoot (DS) and reversed shoot (RS) configurations produced the same patterns and values. In contract, ray tracing patterns and travel time values in the DS and RS configurations demonstrated the different results for the anisotropic medium. Manifestly, these results provided significant confirmation of the fundamental concept that is the velocity of wave propagation in an isotropic medium does not depend on the direction of measurement, while in an anisotropic medium, the velocity of wave propagation was highly dependent on the direction of measurement
Pemodelan Basement Daerah Panas Bumi Non Vulkanik Lainea Konawe Selatan Berdasarkan Data Anomali Medan Gravitasi Wahyudhy; Jamhir Safani; Al Rubaiyn
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 01 (2023): Edisi April Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i01.12

Abstract

Basement rocks often consist of relatively older, denser, and different-density rocks compared to the overlying rock layers. These density variations create gravity anomalies that can be observed and analyzed using gravity methods. Basement modeling implementation can be utilized for geothermal exploration. In the Lainea , Southeast Sulawesi, there is geothermal potential. While some research has been conducted, no studies on basement modeling have been found. Therefore, to enrich the study, this research performs 3D basement modeling in the Lainea area based on gravity measurement data. The modeling is carried out using the Grav_D_Inv inversion program, utilizing residual gravity anomalies from complete Bouguer anomalies. The program runs on MATLAB with a graphical user interface (GUI) and relies on several parameters, including anomaly depth estimation, area size, wavenumber range for low-pass filters, density contrast, and windowing. The inverted basement in the Lainea geothermal area, integrated with geological and previous geophysical studies, can be interpreted as metamorphic rocks with intrusive igneous rocks in the central area. The Lainea geothermal basement relief tends to follow surface structural and topographic patterns, displaying intrusive structures at depths of 1200 - 1500 meters with a peak area in the southeast region of the research area.
Analisis Konsentrasi Logam Berat pada Permukaan Tanah Berdasarkan Nilai Suseptibilitas Magnetik di Pesisir Teluk Lasolo dan Sekitarnya Aziza Nur Aziza; Irawati Irawati; Erzam Salahudin Hasan
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 03 (2023): Edisi Desember Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i03.14

Abstract

This research is located in Lasolo Bay, that is at Tapuemea Village, Molawe District, North Konawe Regency. The purpose of the study was to determine the concentration of heavy metals based on magnetic susceptibility values using X-Ray Fluorescence (XRF) and determine sediment quality. The results of XRF measurements showed that the highest concentrations of heavy metals for mining zones, coastal zones and residential zones were Nickel (Ni), Iron (Fe) and Cobalt (Co), while heavy metals that did not exceed the maximum threshold were Copper (Cu) and Zinc (Zn). Sediment quality as seen from the Pollution Load Index (PLI) analysis is included in the polluted category with a geoaccumulation index value indicating that there has been pollution with moderate to extremely severe pollution categories.
Studi Geologi Teknik dan Kestabilan Lereng di Ruas Jalan Kendari-Andoolo, Kecamatan Wolasi, Kabupaten Konawe Selatan, Sulawesi Tenggara Masri; Nurul Fauziah; Syamsul Razak Haraty; Laode Ngkoimani; Harisma
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 01 (2023): Edisi April Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i01.15

Abstract

This research presents the engineering geological features of the Kendari-Andoolo road section, Wolasi Sub-district, South Konawe Regency, Southeast Sulawesi, a vulnerable area for landslides. The slope factor of safety (FoS) was also determined using the limit equilibrium method on a single and overall slope. Hand auger drilling and Wenner-Schlumberger configuration geoelectric surveys were conducted to estimate the slope failure plane. The study area is composed of phyllite, mudstone, and sandstone. Discontinuities at the face of the slope are N45ºE and N105ºE shear fractures, N280ºE foliation, and N310ºE fault brecciation. The overburden is low plasticity organic silt (OL) with a density range of 16.92 kN/m3-18.01kN/m3 and a plasticity index of 8.64-10.57 (medium). The FoS values of the slopes assumed rotational and nonrotational slip failures. On a single slope assuming rotational failures, the FoS value was lower than the nonrotational plane but still above the threshold value. The critical FoS is on the rotational sliding plane on the overall slope model. The slope's landslide failure plane is the clay's boundary layers and weathered phyllite.
Identifikasi Potensi Tingkat Kerusakan Gempabumi Berdasarkan Indeks Kerentanan Seismik Menggunakan Metode Hvsr di Kecamatan Kadia Kota Kendari La Hamimu Hamimu; Abdul Manan; Risky Ramadhani
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 01 (2023): Edisi April Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i01.16

Abstract

This research was conducted to identify the potential level of earthquake damage in Kadia District, Kendari City. The potential level of damage is known based on the seismic vulnerability index parameter. The data used is microtremor data obtained from the results of the frequency filtering process of ground vibration data using a Band Pass Filter type with a frequency range of 1.00 to 25.00 Hz. While the ground vibration data was obtained from the results of direct measurements in the field at 16 measurement points using 1 set of portable seismograph TDL 303S. Furthermore, the data is processed using the Horizontal to Vertical Spectral Ratio (HVSR) method to produce the dominant frequency of the soil and the amplification factor used to calculate the seismic vulnerability index. From the results of data processing carried out scientifically in Kadia District, Kendari City, a seismic vulnerability index value was obtained with values ranging from 0.761 to 5.292 /cm. Based on the results of mapping of the potential level of earthquake damage obtained from the results of the seismic vulnerability index value, it shows that Kadia District, Kendari City has a low to moderate potential for damage due to earthquakes. Low zones with seismic vulnerability index values ​​< 3 are scattered in Kadia, Bende, Anaiwoi, and Wowawanggu Villages. Moderate zones with seismic vulnerability index values ​​< 3 to 6 are scattered in Kadia, Pondambea, and Bende Villages.
Analisis Tingkat Seismisitas dan Percepatan Tanah Maksimum (PGA) Wilayah Sulawesi Tenggara Berdasarkan Data Gempabumi Periode 1973-2022 Al Rubaiyn; Jamhir Safani; Khairul Anwar
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 02 (2023): Edisi Agustus Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i02.17

Abstract

Abstract. An analysis of seismicity level and maximum ground acceleration of Southeast Sulawesi region has been conducted. The purpose of this research is to map the level of rock fragility (b value), seismicity level (a value), and maximum ground acceleration (PGA) of Southeast Sulawesi. The earthquake data used is sourced from USGS and BMKG for the period 1973-2022. Zmap software was used to calculate a value and b value. PGA from accelerograph data was used to find a suitable empirical method to calculate the PGA of Southeast Sulawesi. The selection of a suitable method is based on the smallest average error value. Based on the analysis results obtained, the value of rock fragility level ranges from 0.355-1.337 while the seismicity level ranges from 2.773-7.879 with the highest value is in the southeast area of Southeast Sulawesi. The comparison results of PGA values from accelerograph data and empirical methods show that the Liu & Tsai method has the lowest RMSE of 5.27 gal. Liu & Tsai's PGA values for Southeast Sulawesi ranged from 18.6-155.7 gal.

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