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Jurnal Geofisika
Published by Himpunan Ahli Geofisika Indonesia
ISSN : 0854352     EISSN : 24776084     DOI : https://doi.org/10.36435/jgf
Core Subject : Science,
Earth & Planetary Sciences Energy Physics
Jurnal Geofisika [e-ISSN : 2477-6084] is a scientific journal published by Himpunan Ahli Geofisika Indonesia (HAGI). This journal is referenced, each paper was assessed and evaluated by editors and reviewers who are experts in the relevant fields and come from education institutions and industry, both from within and outside the country. The published article covers all science and technology including Geophysics, Meteorology, Oceanography, Geology and Geodesy.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geofisika
Articles 100 Documents
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Modeling Lithosphere Structure in Central Java using Local Events and Tomography Saputra, Ryandika
Jurnal Geofisika Vol 22 No 1 (2024): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v22i1.539

Abstract

Pengaturan tektonik pulau Jawa sangat dikendalikan oleh tumbukan lempeng Indo-Australia yang mensubduksi lempeng Eurasia. Tingginya aktivitas tumbukan lempeng Eurasia dan Indo-Australia seringkali menyebabkan terjadinya gempa megathrust, munculnya arc magmatism yang meliputi letusan gunung berapi. Penelitian ini bertujuan untuk mengetahui pola tektonik di bawah Jawa Tengah berdasarkan inversi tomografi gelombang-P. Metode fast-marching digunakan sebagai ray tracing dan subspace inversion untuk mencitrakan model kecepatan bawah permukaan hingga kedalaman 150 km. Data yang digunakan dalam penelitian ini adalah data katalog yang berasal dari jaringan seismometer seperti MERAMEX yang terpasang di sekitar Jawa Tengah dan DOMERAPI yang terpasang di sekitar Gunung Merapi dan Gunung Merbabu. Kami juga menyertakan data event yang dikumpulkan dari Pusat Seismologi Internasional. Secara total, kami memproses 563 kejadian gempa untuk menggambarkan struktur kecepatan di bawah Jawa Tengah. Model checkerboard menunjukkan bahwa resolusi yang baik dapat diidentifikasi pada kedalaman dangkal, termasuk lepas pantai selatan Jawa yang dikontribusikan dari data Seismometer Dasar Laut. Pada sumbu vertikal, model resolusi yang baik dapat diharapkan hingga kedalaman 150 km. Model gelombang P saat ini menunjukkan zona kecepatan rendah yang berbeda di bawah Gunung Merapi yang dapat dilihat hingga kedalaman 40 km, menunjukkan kemungkinan reservoir magma dalam yang terpisah. Di sebelah selatan kawasan Gunung Merapi juga menunjukkan model kecepatan rendah yang mungkin berhubungan dengan pegunungan di bagian selatan. Selain itu, bagian utara Gunung Merapi menampilkan model kecepatan yang sangat rendah ke arah Timur dan Barat dengan anomali di Bagian Timur tampaknya memiliki perluasan yang lebih dalam hingga kedalaman 50 km. Kami menghubungkan anomali ini dengan Anomali Merapi Lawu dan Cekungan Kendeng. Hasil kami menunjukkan hasil yang serupa dengan model tomografi sebelumnya di wilayah ini.
Analisis Perubahan coulomb stress Gempa Bumi Cianjur 21 November 2022 Harefa, Faradilla Firdani; Lubis, Lailatul Husna; Sirait, Ratni
Jurnal Geofisika Vol 22 No 2 (2024): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v22i2.617

Abstract

The earthquake that occurred in Cianjur Regency on November 21, 2022 with a magnitude of 5.6 Mw had a huge impact, including casualties and meterial damage. The location of the earthquake based on data sourced from BMKG was at -6.870° N and 107.016° E and the earthquake occurred due to the Cugenang fault. After the 5.6 Mw earthquake was followed by a series of aftershocks. The purpose of this study was to determine the effect of coulomb stress changes on the Cianjur earthquake and the direction of aftershock distribution using the coulomb stress method. The results of this study show the effect of coulomb stress on earthquakes in Cianjur Regency forming 8 lobes. 4 red lobes that mean an increase in stress, namely (north direction is in Cipanas and Pacet sub-districts, east direction is in Cugenang sub-district, south direction is in Cireunghas sub-district, and southwest to west direction is in Cikole sub-district) with a value of 0 to 0, 2 bar and 4 blue lobes indicating a decrease in stress, namely (northeast direction in Sukaresmi sub-district, southeast direction in Warungkondang, Cibeber and Cilaku sub-districts, southwest direction in Sukaraja, Sukabumi and Sukalarang sub-districts, and west to northwest direction in Nagrak, Kadudampit and Caringin sub-districts) with a value of 0 to -0.2 bar. The distribution of aftershocks was more in Cugenang sub-district and partly in Warungkondang sub-district.
Mineral Perspectivity Mapping in the Montana Region Based on a Combination of Variations in Gravity, Magnetic, and Geochemical Data Using Likelihood Ratio and Fuzzy Logic Methods Adib, Jauhar Maknun
Jurnal Geofisika Vol 22 No 1 (2024): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v22i1.544

Abstract

Montana is a province in the United States which is nicknamed the "Country of Treasures" because it has a variety of metal commodities so mapping the mineral prospects in Montana is very interesting. It is necessary to understand the mineralization of porphyry deposits at the research site to determine the role of gravitational, magnetic, and geochemical data. In this study, the data integration used is the likelihood ratio and fuzzy logic methods to obtain ore body maps, mineralization grade maps, and mineral prospect maps at the research site. From the variation of gravity and magnetic data, a map of the distribution of the ore body is obtained. From the geochemical data of Au, Ag, Cu, As, Pb, and Zn, a map of the mineralization level in the study area was obtained. The ore body potential map and mineralization level map are combined again to get a mineral prospect map. then all map results from the likelihood ratio method and the fuzzy logic method are interpreted and compared. From the mineral prospect map, the authors succeeded in mapping the mineralized zone to select exploration targets with a total area of ​​mineralization obtained of 8223 Km2 with the widest area of ​​2868 Km2 in plutonic rock types with granitic lithology
Analisis Potensi Likuefaksi di Kecamatan Balige Berdasarkan Global Geospatial Model (GGM) Prabowo, Diki; Lubis, Lailatul Husna; Daulay, Abdul Halim; sugeng, Sugeng
Jurnal Geofisika Vol 22 No 2 (2024): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v22i2.623

Abstract

Kecamatan Balige merupakan salah satu dari banyak kecamatan yang ada di Kabupaten Toba Samosir. Letak geografis Kecamatan Balige berdekatan langsung dengan danau vulkanik terbesar di Indonesia yaitu danau Toba. Kecamatan Balige memiliki catatan gempa sebagai daerah yang termasuk dari beberapa daerah yang terkena dampak gempa bumi yang terjadi di Kabupaten Toba Samosir pada 2021 silam. Penelitian yang dilakukan di Kecamatan Balige memiliki tujuan guna mengetahui nilai Vs30 (kecepatan gelombang geser rata-rata hingga kedalaman 30 meter), nilai peak ground velocity (PGV) di daerah tersebut dan menganalisis potensi likuefaksi di Kecamatan Balige. Analisis potensi likuefaksi yang dilakukan menggunakan metode Global Geospatial Model (GGM), dengan meninjau beberapa faktor-faktor yang digunakan sebagai parameter dalam perhitungan suseptibilitas dan probabilitas potensi likuefaksi, diantaranya nilai kecepatan gelombang geser rata-rata hingga kedalaman 30 meter (Vs30) yang diperoleh melalui USGS (United States Geological Survey), nilai peak ground velocity (PGV) berdasarkan pemodelan dari perangkat lunak ShakeMap terhadap skenario gempa terburuk pada sesar sumatera segmen Toru, nilai presipitasi berupa curah hujan rata-rata tahunan periode lima tahun terakhir (2018-2022) dan jarak ke body water (jarak ke danau dan sungai terdekat). Nilai sebaran yang dihasilkan melalui proses pemodelan menggunakan perangkat lunak ArcGIS 10.8. Berdasarkan perolehan yang didapat nilai Vs30 di Kecamatan Balige menghasilkan nilai sebaran pada rentang nilai 255 m/s hingga 897,8 m/s, nilai PGV (Peak Ground Velocity) di Kecamatan Balige berada pada rentang nilai 7,94 cm/s sampai 15,20 cm/s. Perolehan probabilitas potensi likuefaksi yang diperoleh tergolong tinggi yaitu berada pada presentase probabilitas 0,378.
Analisis Data Mikrotremor Untuk Mengetahui Nilai Indeks Kerentanan Seismik Di Kecamatan Jambi Luar Kota Airunisa, Airunisa; Resta, Ichy Lucya; Ngatijo, Ngatijo
Jurnal Geofisika Vol 22 No 1 (2024): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v22i1.556

Abstract

Jambi Luar Kota Subdistrict is located in a regional geology which is dominated by sedimentary layers and has the highest population density in Muaro Jambi Regency. The population that continues to increase has resulted in regional development in the form of infrastructure development, shops, roads, housing and high-rise buildings increasing very rapidly. In this development planning, information is needed regarding land conditions and regional stability conditions against the threat of soil movement by identifying the dynamic characteristics of the soil layer which includes the value of the seismic vulnerability index (Kg). The value of Kg was obtained by calculating the values ​​of fo and Ao from the results of microtremor data processing as many as 61 measurement points using the HVSR method. The fo values ​​obtained ranged from 0.31 to 6.08 Hz and the Ao values ​​ranged from 0.99 to 2.89. The Kg values ​​obtained ranged from 0.16 to 16.62 with a relatively high distribution of Kg values ​​in Sembubuk Village, Rengas Bandung, Kedemangan, Sarang Burung, Senaung, Penyengat Olak, Sungai Duren, Muaro Pijoan, Mendalo Darat, Mendalo Indah, Mendalo Laut, Muaro Pijoan, and Pematang Jering which show these areas are more susceptible to damage if there is ground movement. Key words : Microtremor, dominant frequency, amplification, seismic susceptibility index,HVSR
Estimasi Kedalaman Sumber Anomali Regional dan Analisis Mekanisme serta Pola Kelurusan Sesar Musi Menggunakan Metode Gaya Berat Fatimah, Rizkahana; Yusuf, Mahmud
Jurnal Geofisika Vol 23 No 1 (2025): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v23i1.621

Abstract

Musi Fault is one of the segments of the Semangko Fault (Great Sumatra Fault) that triggered the M6.0 Curup earthquake on December 15, 1979. Until now, the Musi Fault is still recorded as an active fault with a slip rate of 13.5 mm/year. The location of the Musi Fault is at 102.2º East - 102.9º East and 3.2º East - 3.9º East. This region is a part of a growing tourism industry, while there are risks due to seismic activity and seismicity in the region. Therefore, it is necessary to analyze the gravity in the Musi Fault area. This study aims to determine the estimated depth of the regional anomaly source zone based on the results of spectrum analysis. Then, derivative analysis is also carried out to identify the mechanism and location of faults so that a picture of the alignment pattern of the Musi Fault can be obtained. The method used in this research is the gravity method using data from GGMplus, Batnas, Demnas, and other supporting data used to validate the analysis results. The spectrum analysis results show that the estimation of the regional zone depth reaches 1,366.8 meters and the residual zone depth reaches 128.69 meters. The results of derivative analysis using Surfer 14 are displayed in a curve to obtain the fault location boundary which is then displayed in a map showing that the Musi Fault has a northwest - southeast alignment pattern. The fault mechanism is dominated by shear faults and there are several points that tend to be oblique. The analysis results are in accordance with previous studies, which state that the Musi Fault has a strike slip mechanism.
Performance Evaluation of ADS 1256 for Geoelectric Data Acquisition System: Laboratory Scale Comparative Study Pratama, Yudha Agung; Suharsono, Suharsono
Jurnal Geofisika Vol 23 No 1 (2025): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v23i1.674

Abstract

The need of flexible and affordable geoelectric data acquisition systems is growing, particularly for research and educational purposes. This study aimed to evaluate the performance of a resistance measurement system based on the ADS1256 high-precision ADC module on a laboratory scale. Initial testing was conducted on a laboratory scale using various resistance values. The best accuracy was found in the medium to high resistance range R1 (subsurface target) (>10 Ω); at low resistance, the accuracy value decreased dramatically. A relative error (ε) reading of - 6.7% occured at low values of R1. The condition of the resistance R2 (surface) affected the stability of the ADS 1256 system reading. Based on the standard deviation value there was an indication of nonlinearity in the readings, particularly in the voltage readings. The current measurements produced relatively stable readings. There was an increase in the fluctuation of readings, especially at low surface medium (R2). Overall, the ADS1256 system demonstrated promising potential as a low-cost alternative for resistance measurement, particularly effective in the medium to high resistance range. Comprehensive data across all R1 and R2 variations require additional calibration and enhanced circuit stability to better align with reference values
Rekonstruksi Prospek Endapan Mineralisasi di Kaligesing: Pendekatan Terintegrasi Geologi, Geomagnetik, dan Gravitasi Satelit Muhlisin, Haris; Nur Hani, Muhammad Alfa; Falahi, Akmal Nazla
Jurnal Geofisika Vol 23 No 1 (2025): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v23i1.679

Abstract

Kehadiran struktur geologi dan posisinya sebagai fasies pusat pada daerah tengah Pegunungan Menoreh menyebabkan berkembangnya alterasi dan mineralisasi di bagian batuan intrusi andesit. Selain itu daerah fasies pusat/central ini sebagai tempat terbentuknya batuan ubahan epidot-klorit kalsit di sisi barat Gunung Gajah yakni di daerah Kaligesing. Penelitian ini menyelidiki potensi mineralisasi di daerah Kaligesing, Purworejo, Jawa Tengah dengan mengintegrasikan data geofisika gravitasi dan magnetik. Metode gravitasi satelit (GGMPlus) sebagai survei awal dilakukan di area seluas 7x8 km yang mengidentifikasi titik penelitian berdasarkan nilai densitas. Survei geomagnetik yang lebih rinci kemudian dilakukan di plot seluas 3x4 km dengan 248 titik akuisisi yang diukur. Hasil metode gravitasi menunjukkan nilai Anomali Bouguer Lengkap (CBA) berkisar antara 96,9 hingga 128,7 mGal dengan nilai tinggi di bagian barat dan nilai sedang hingga rendah di bagian timur. Variasi ini menunjukkan perbedaan densitas batuan dan potensi kontrol struktural terhadap mineralisasi. Survei geomagnetik mengungkapkan nilai Intensitas Magnetik Total (TMI) berkisar antara -102,7 hingga 584,1 nT dengan daerah bersuseptibilitas tinggi (584,1 hingga 220,3 nT) yang menunjukkan zona-zona yang kaya mineral potensial. Peta Reduce to Pole (RTP) mengungkapkan struktur sesar yang berorientasi utara-selatan dan barat laut-tenggara. Peta filter Total Horizontal Gradien (THG) dan Tilt Angle (TA) menyoroti batas anomali yang menunjukkan sesar-sesar yang mengontrol mineralisasi. Metode geofisika yang terintegrasi dengan data geologi ini secara efektif memetakan struktur-struktur pengendali dan saling menguatkan interpretasi, yang membantu dalam mengidentifikasi zona mineralisasi prospektif.
Identifikasi dan Pemodelan 2D Zona Akuifer Daerah Buffalo River Dengan Menggunakan Data Audiomagnetotelluric Irawati, Selvi Misnia; Amin, Fadhlan amin; Paembonan, Andri Yadi
Jurnal Geofisika Vol 23 No 1 (2025): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v23i1.646

Abstract

Water is one of the important components in life on earth. The water source that is widely used now is groundwater. Groundwater is water that is below the surface and occupies cavities in the geological layer. This layer is called the aquifer layer. Groundwater exploration from shallow to very deep depth targets is an option for water availability.the study area is in the watershed of Buffalo, Arkansas. The buffalo river area has the potential for groundwater with a very deep depth. The depth of groundwater is very deep it is a problem to use geophysical exploration methods that are commonly carried out such as geoelectricity. Estimating aquifer layers is a problem that can be solved using audiomagnetotelluric (AMT) methods, especially aquifer layers at depths of more than 100 meters. Hence the need for this method to achieve targets and lithology at such depths. The use of the AMT method with a frequency range of 1 Hz – 10,000Hz which can reach depths of more than 1000 meters is one of the solutions to the problem of estimating very deep targets. AMT data rotated towards geoelectrical strike by N75oE. AMT modeling used using 2D inversion, the type of inversion is Non Linear Conjugate Gradient. Based on the results of modeling and interpretation, the formations arranged in the study area consist of the Bloyd formation, Hale formation, Boone formation, Everton formation and Ordovician formation. Layers that have potential as aquifer layers are obtained at low resistivities of 1-100 Ωm, are at depths of 0 - 500 meters with lithology arranged in the Bloyd formation and Hale formation. The formation is composed of several types of rocks, namely sandstone and limestone
Karakteristik Atenuasi Gelombang Seismik di Daerah Ternate, Maluku Utara dengan menggunakan Analisis Gelombang Coda Satriani, Fatima Marjan Keshia; Anggono, Titi; Hasanah, Mia Uswatun
Jurnal Geofisika Vol 23 No 1 (2025): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v23i1.660

Abstract

The convergence of the Philippine Plate, the Eurasian Plate, the Australian Plate, and the double subduction between the Molucca Sea Plate, the Sangihe Through, and the Halmahera Through have created a complex tectonic setting in North Maluku. Due to intense tectonic activity, this region frequently experiences the possibility of tectonic events like earthquakes. In the attenuation seismology approach, seismic waves propagating below the surface are measured for amplitude amplification and attenuation. Seismic wave attenuation propagating in this region is described using the coda attenuation method on coda seismic waves. In order to determine the degree of tectonic activity in the Ternate region, 129 earthquake data points from four sites in North Maluku that were less than 40 kilometers deep were processed. Stations SP01 and SP02 are situated on Ternate Island, whereas stations BB06 and SP28 are situated on Hiri Island. A sampling frequency of 2 – 10 Hz and a window length of 20 – 120 s were used to get values of the coda (Q0), η, Qc, and attenuation (Qc-1). Twi times the S-wave’s arrival time is assumed for the coda wave. The coda variation values (Q0) were recorded as follows: an average of 112. 167 for station SP01, 91.071 for station SP02, 116.089 for station SP28, and 112.843 for station BB06. The value increases and decreases within the 20 – 40 s range. The values of attenuation and (Q0) are inversely related. The Q0 and Qc values obtained are low due to the high damping value in the Ternate area. The high damping (Qc-1), high eta (η) value (>1), and low Q0 value (<200) are thought to be signs of strong tectonic activity in the Ternate, Halmahera, North Maluku region.

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