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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 30 Documents
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Analisis Kandungan Kapur (CaCO3) Pada Sumber Air Bersih Di Kelurahan Tampo Kecamatan Napabalano, Kabupaten Muna Sahidin Sahidin; La Aba Aba; Rosliana Eso; Ali Okto; Alfirrman Alfirman; La Ode Andimbara
Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 01 (2024): Edisi Arpil 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.v6i01.69

Abstract

Salah satu indikator penting untuk penilaian air layak konsumsi bagi masyarakat adalah kandungan kapur atau biasa disebut sebagai kesadahan air. Menurut World Healt Organization (WHO), bahwa air yang mengandung zat kapur tinggi dapat menimbulkan dampak terhadap kesehatan seperti penyumbatan pembuluh darah jantung (cardiovascular desease), batu ginjal (urolithiasi) yang dapat menyebabkan kencing batu serta masalah kesehatan lainnya, masalah ekonomi seperti penggunaan detergen serta dalam bidang industri seperti adanya kerak pada mesin. Kandungan mineral yang terkandung dalam air sangat dipengaruhi oleh lingkungan sekitarnya. Kelurahan Tampo, Kecamatan Napabalano secara geologis tersusun oleh batugamping dan merupakan daerah karst yang berkembang dengan baik. Keberadaan daerah karst dan kondisi tipologi batuan, menjadikan wilayah Kelurahan Tampo sebagai daerah berkapur dan ancaman sumber air tanah memiliki kadar kapur yang cukup tinggi. Oleh Karena itu, perlu Identifikasi dan Pengukuran Kandungan Kapur (CaCO3) Sumber Air Bersih di Kelurahan Tampo, Kecamatan Napabalano, Kabupaten Muna. Penelitian ini dilaksanakan dengan Pengambilan sampel secara acak pada beberapa sumur gali masyarakat yang digunakan sebagai air bersih. Analisis sampel air yakni kadar kapur atau tingkatan kesadahan air dilakukan seacara kualitatif dan kuantitatif. Secara kulitatif menggunakan metode elektrokoagulasi sedangkan secara kualitatif menggunakan metode Atomic Absorption Spectrophotometry (AAS) dan Titrasi EDTA di Laboratorium Forensik FMIPA UHO. Berdasarkan hasil analisis laboratorim pada 12 sampel air, terdapat 11 sampel memiliki tingkat kesadahan tinggi dan 1 sampel memiliki tingkat kesadahan rendah. Jadi, secara keseleuruhan sampel air yang ada di Kelurahan Tampo memiliki tingkat kesadahan yang cukup tinggi
Analisis Stabilitas Lereng Jalan di Kecamatan Wolasi Kabupaten Konawe Selatan Provinsi Sulawesi Tenggara Laode Jonas Tugo; La Ode Sahidin; Ali Okto; Indrawati
Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 01 (2024): Edisi Arpil 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.v6i01.71

Abstract

The provincial road that stretches in Wolasi District, Matawolasi Village, South Konawe Regency, has hilly and mountainous topography. The road cuts through hillsides and mountains, resulting in the formation of a steep slope on one side of the road. Such conditions can pose a threat in the form of landslides or mass movement of rock/soil which can occur at any time. This research aims to analyze the characteristics of the rock mass and evaluate the stability of the road slope. To achieve the research objectives, several stages were carried out, namely field measurements, data processing (determining the type of landslide and empirical parameters) and slope stability analysis. The field measurement method used is the scanline method. The methods used to analyze slope stability are kinematic, analytical and Slope Stability Probability Classification (SSPC) methods. The research results show that the types of landslides at the observation station consist of plane landslides and wedge landslides. The probability value of slope stability at 10 observation station points is above 95%. This is confirmed by the results of the slope safety factor (FK) calculation which shows that the overall FK value of the slope is above 3.
Eksplorasi Air Tanah di Desa Langori, Kecamatan Baula, Kabupaten Kolaka, Menggunakan Metode Resistivitas Schlumberger Usmardin Usmardin; Jahidin Jahidin
Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 01 (2024): Edisi Arpil 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.v6i01.72

Abstract

Efforts have been made to search for subsurface water sources using geophysical methods, namely the Schlumberger resistivity method by mapping groundwater resources. This research aims to determine the existence of groundwater resources in the Kolaka Regency area, especially Langori Village, Baula District. Data collection was carried out at two measuring locations and processed using Progress. The results show a profile of groundwater resistivity values of 3.32 Ωm – 48.96 Ωm at a depth of 4.92 m to 370 m. It is suspected that the groundwater layer for measuring location point 1 or line 1 is at several depths, 8.57 m - 9.42 m, 13.30 m - 27.22 m, 166.28 m - 188.36 m, and 249.78 m - 370 m, each of which has a resistivity value of 26.95 Ωm, 6.52 Ωm, 31.54 Ωm, and 31.82 Ωm. Measuring location point 2 or line 2, the suspected groundwater layer is found at a depth of 4.92 m - 8.55 m, 20.53 m - 31.60 m, and 70.73m - 117.42 m, respectively each has a resistivity value of 41.91 Ωm, 3.32 Ωm, and 32.11 Ωm.
Identifikasi Potensi Air Tanah di Pulau Katela Kabupaten Muna Barat Menggunakan Metode Geolistrik Resistivitas La Ode Andimbara; Sawaludin Sawaludin
Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 01 (2024): Edisi Arpil 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.v6i01.74

Abstract

Island Katela has a population of 957 people. Currently, the community has difficulty getting clean water. Activities to identify potential groundwater resources on Katela Island need to be carried out to solve this problem. The purpose of this research activity is to identify the subsurface of the land on Katela Island, West Muna Regency using the geoelectric resistivity method to obtain information on the potential of the groundwater layer. The main objective is to determine the existence of groundwater resources on Katela Island where the presence of groundwater is depicted in 2-dimensional (2D) and 1-dimensional (1D) subsurface resistivity cross-sectional models. The results obtained show that the structure of the subsurface layers in the survey area consists of layers of clay, sand, sandstone, limestone, salt water layers and groundwater (fresh) layers. The potential existence of a groundwater layer (fresh) is at a depth of 31.25 m at Site 1, with a resistivity value above 0.2 Ωm to 1 Ωm. This layer is thought to be a fresh water layer because above it there is a layer of clay which is impermeable so it is difficult for sea water to intrude. Based on resistivity data, at shallow depths (at the surface to a depth of 25 m) in the survey area sea water has been intruded.
Implementasi Matrix Laboratory Dalam Pengolahan Data Mikrotremor Menggunakan Metode Hvsr: Studi Kasus Di Daerah Pesisir Kecamatan Moramo Sitti Fauziah Faradilla; La Hamimu Hamimu; Laode Ihksan Juarzan
Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 02 (2024): 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.v6i02.48

Abstract

Vibration characteristics in a region of the earth are strongly influenced by unique physical and geological parameters, resulting in diverse responses to natural and anthropogenic disturbances. This research not only contributes to the understanding of geology and vibration response, but also presents a methodology that can be widely applied in passive seismic research. The analysis method in this study uses MATLAB programming language for microtremor signal processing. The algorithm of this research is able to produce a model that reveals the frequency and statistical characteristics of the microtremor signal, the output is quite similar to the open-source software GEOPSY in HVSR processing. There are 15 research data with type .msd as a representation of 15 measurement points scattered in Moramo sub-district. The statistics obtained show that the dominant ground frequency (F0), amplification factor (A0), and seismic susceptibility index (Kg) in the Coastal Land of Moramo Subdistrict range from 0.519792 - 14.692654 Hz, 2.250096 - 6.370357 times amplification, and 0.500194 - 50.516144 s²/cm, respectively. These results are quite similar to previous research by RIVAL (2023) who used GEOPSY software as his analysis tool. The statistical distribution in the form of dominant frequency (F0), amplification (A0) and seismic susceptibility index (Kg) were then interpolated and overlaid with the geodata of the study area using the Mapping Toolbox which is also in the MATLAB environment.
Kondisi Hidro-Oseanografi di Wilayah Perairan Desa Peropa , Kabupaten Wakatobi, Sulawesi Tenggara Al Firman Firman; La Ode Muh. Gunawan Giu
Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 02 (2024): 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.v6i02.75

Abstract

The waters of Peropaare part of the water area in South Kaledupa District, Wakatobi Regency, Southeast Sulawesi. This research is needed to determine the components of hydro-oceanography, namely tides, bathymetry, currents and waves. Tidal conditions were obtained through analysis using the Admiralty Method from tidal data for 15 days, resulting in a semidiurnal mixed tide prevalling type with the highest tide of 3.16 m and the lowest low tide of -0.29 m. The bathymetry measurement method uses hydroacoustic principles via a single beam echosounder instrument, obtaining a depth of 10 m closest to the coastline at a distance of 70 m in the northwest part of the research area and at a distance of 20 m in the southeastern part of the research area. Conditions for the movement of ocean currents and waves are carried out using a hydrodynamic model approach. Based on the results of the ocean current model, the direction of the current tends to follow the coastline with the dominant flow direction moving east and north at high tide and south and west at low tide, with a current speed range of 0.075-0.13 m/s at the highest tide and 0.04 -0.1 m/s at lowest ebb. The wave heights that occur in the research area range from less than 0.75 m to 2.5 m.
Analisis Potensi Penurunan Muka Tanah Daerah Wisata Alam Aik Bukaq Syarifatul Ulfah; Adi Susilo
Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 02 (2024): 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.v6i02.78

Abstract

Land movement is one of natural disaster that occurs unexpectedly. So, the mitigation needs to be provided as early as possible to avoid the impact of the disaster. One of the land movements that often occurs is land subsidence. Within this paper aims to analyze the value of land subsidence in the Nature Tourism area of Aik Bukaq. The land movement was estimated from Sentinel 1A image data with starting from the data range for April 2022 – 2024 and processed using the DInSAR (Differential Interferometry Synthetic Aperture Radar) method in SNAP software. The DinSAR method is one of method that often used to analyze the value of land subsidence. ​Because it’s able to record data in any condition. After processing data in SNAP software, land subsidence values ​​were read and mapped at the coordinate points of research area using Google Earth Pro software. Therefor results obtained the average value of land subsidence in last of 2 years (2022 – 2024), from -0,18 cm/year and -0,21 cm/year respectively. With an average of -0,114 cm/year which is included in the very low land subsidence category. However, there is a significant increase of value in the last 2 years, which really needs to be beware as an initial step to mitigate the impacts of land movement disasters. Because at any time it can happen in the Nature Tourism area of Aik Bukaq
Analisis Ground Shear Strain HVSR untuk Mengidentifikasi Potensi Gerakan Tanah di Kecamatan Kadia, Kota Kendari Kristiani Eka Ratte; Abdul Manan; Laode Ihksan Juarzan
Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 02 (2024): 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.v6i02.79

Abstract

This research on Ground Shear Strain (GSS) was carried out to determine the potential for ground movements in Kadia District, Kendari City. In its implementation, GSS is processed using microtremor data from measurements in the field. GSS is the result of multiplying the Seismic Vulnerability Index (Kg) and the basement Peak Ground Acceleration (PGA). Microtremor data were taken at 16 measurement points with a distance between measurement points of 400 to 600 m. The microtremor data were then analyzed using the HVSR (Horizontal to Vertical Spectral Ratio) method available in Geopsy 3.3.6 software to obtain predominant frequency values (f­o) and amplification factors (Ao). These two parameters are used to calculate the Kg value. The PGA value is determined using the Fukushima and Tanaka empirical formula using earthquake data with a depth of ≤ 50 km and surface magnitude (MS) ≥ 5 SR. The research results show that the GSS values in Kadia District, Kendari City ranges from 1.1768x10-4 to 6.5436x10-4. Based on the results of ground movement analysis, it is known that Kadia District, Kendari City, has the potential to experience cracks or land subsidence if an earthquake occurs with elasto-plastic soil dynamics. Apart from that, it is also known that the Kadia District area of Kendari City is not prone to landslides and liquefaction because g < 10-2.
Interpretasi Data Mikrotremor Melalui Analisis Horizontal To Vertical Spectral Ratio (HVSR) untuk Mikrozonasi Bahaya Gempa Seismik di Kota Baubau Rudin; Jamhir Safani
Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 02 (2024): 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.v6i02.92

Abstract

Research has been carried out on seismic hazard microzonation in the city of Bau – bau using microtremor data. The aim of this research is to determine the seismic vulnerability index based on horizontal to vertical spectral ratio (HVSR) analysis and create a dominant frequency microzonation map (F0), dominant period map (T0), amplification factor map (A0), and seismic vulnerability index map (Kg) from microtremor data which can describe the level of vulnerability of an area to seismic hazards. Microtremor measurements were carried out using a portable three-component seismograph (TDS. 303), the data was analyzed with gepsy software via the HVSR method. The research results show that the distribution of dominant frequency values ​​(F0), ranges from 0.4795 Hz to 16.6383 Hz, dominant period values ​​(T0), ranges from 0.0601 seconds to 2.0854 seconds, amplification factor values ​​(A0), ranges from 1.2285 to 4.9043, and the seismic vulnerability index (Kg) value ranges from 0.1043 to 11.0276. The values ​​(F0), (T0), (A0), and (Kg) are interpreted by referring to literature data and surface geological maps of the research area. The results show that the study area has a small portion of sediment layers that are vulnerable to seismic hazards.
Identifikasi Keberadaan Zona Potensi Air Tanah di Perumahan GAR Menggunakan Metode Geolistrik Resistivitas Zakia Masrurah; Rivina Annisa; Amsir; Wahidah; Nurul Azmi Harun
Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 02 (2024): 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.v6i02.94

Abstract

The GAR (Grand Aceh Residence) housing estate is located in Baet Village, Aceh Besar District and was constructed on the land of a pond that has been filled in and is close to the coast. The majority of residents use clean water sources from PDAM because of the difficulty of obtaining clean water. The purpose of the research was to identify potential groundwater zones and determine the conditions. The research method used was electrical resistivity method, SuperSting R8/IP with Wenner-Schlumberger configuration. The research was conducted in 3 lines with 6 m spacing. RES2DINV software based on the least square inversion approach was used for data processing. The results obtained show resistivity values varying from 0.1 - 100 Ohm.m with a depth penetration of up to 28.8m. There are 3 lithological layers obtained, namely clay (0.1 - 1.5 Ohm.m), clayey sand (1.5 - 17.7 Ohm.m), and sand (17.7 - 100 Ohm.m). The groundwater presence zone is assumed to be in the sand layer. There are 2 types of groundwater obtained, which are shallow groundwater (phreatic) located from the center to the north of the lines to a depth of ± 13 m and deep groundwater, located varies in the middle of the lines from a depth of ± 15 m to the end with groundwater conditions may still be brackish due to the influence of seawater intrusion with a resistivity value of 0.1 Ohm.m identified to a depth of ± 25 m

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