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Sekretariat Redaksi Jurnal Geologi dan Sumberdaya Mineral Pusat Survei Geologi, Badan Geologi, Gedung A, Lantai 1 Jalan Diponegoro No. 57, Bandung, Indonesia
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Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Published by Pusat Survei Geologi
ISSN : 08539634     EISSN : 25494759     DOI : https://doi.org/10.33332
Core Subject : Science,
Chemistry Earth & Planetary Sciences Energy
The JGSM acts as a publication media of high quality scientific investigations resulted from various geological scientific issues. Published articles covers Geo-sciences, Geo-resources, Geo-hazards, and Geo-environments. Geo-sciences are basic earth sciences in geology, geophysics, and geochemistry. Geo-resources are applied earth sciences scoping in geological resources. Geo-hazards are applied earth sciences concerning in geological hazards. Geo-environments are applied earth sciences focusing in environmental geology.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 486 Documents
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Active Faults in the Volcanic Environment of Pasirwangi Region, Garut Regency Yudhicara, Yudhicara; Robiana, Rahayu; Muslim, Dicky; Zakaria, Zufialdi; Dinata, Muhammad Nasheer Ramdan; Hartono, Tono
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 4 (2025)
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i4.999

Abstract

Garut Regency is surrounded by many volcanoes, both active and inactive. This area has also several active faults, which historically have been the source of earthquakes, including the Rakutak Fault Segment as part of Garsela Fault and several local faults. Some of earthquakes has magnitude less than M5.0 but causing damages, such as lately occured on September 18 and December 7, 2024.This study aims to identify the root causes of the major earthquakes that frequently occur in the Garut area, particularly those felt locally in Pasirwangi Sub-District and its surroundings, which causing infrastructure damages. Theresults are expected to contribute to disaster risk reductionand geological hazard-based spatial planning in Garut Regency, particularly in the study area. Active faults mapping was carried out using remote sensing, and field verification using drone and visual observations to obtain data that characterizes the presence of faults, joints measurements, rock offsets, river diversion and morphology lineaments. Site class identification was carried out by microtremor measurement using seismograph. Indications of active faults are found in the form of morphological and river lineaments, rock offsets, river diversion and the emergence of springs as indications of fractures along the fault line. Several sagponds were found including in Cihurang which is connected to Lake Ciharuswhich forms the Rakutak fault segment lineament whichis relatively southwest-northeast (SW - NE) oriented.Others were found at Lake Cipondok which is connectedto the river lineament in the Cibongkor area which has awest southwest-east northeast (WSW-ENE) direction. The down-dip faults were observed at Padaawas and has trend relatively south southwest - north northeast (SSW - NNE). Microtremor measurements obtain the dominant frequency values of the research area is in the range of 1 - 4 Hz, Periods of 0,25 – 1 second, the earthquake amplification factors of 3 – 7 times of earthquake shaking, Vs30 of 233 - 545 m/sec. The sediment thickness ranges from 25 - 64 m, and the land type is Class C (Hard Soil) and Class D (Moderate Soil). The Pasirwangi Sub-District and its surroundings, is located in a volcanic environment and is traversed by active faults, which are relatively southwest – northeast (SW-NE), west southwest - east northeast (WSW-ENE), and south southwest – north northeast (SSW-NNE). The Rakutak Segment of Garsela Fault, Padaawas and Cibongkor Faults are active faults that cross the research area, which is in the future could become the source of earthquakes, so that the community needs to be aware, especially those located close to fault lines. The potential for geological disasters in the Pasirwangi Sub-District and its surroundings, needs special attention from various parties, related to disaster mitigation efforts, both structural and non-structural. Keywords: Active Faults, Sagponds, Morphological Lineaments, Rocks Offset, Site Class
Karakteristik Faktor Penguatan Gelombang Gempabumi oleh Lapisan Lunak Permukaan, Studi Kasus di Wilayah Perkotaan Cianjur dan Sekitarnya Marjiyono, Marjiyono; Hidayat, Hidayat; Hamidah, Nimas Nurul; Hawan, Shofi Iqtina; Setiawan, Johannes Bosco Januar Herry; Andriani, Shofi
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 4 (2025)
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i4.1009

Abstract

Disamping dekat dengan sumber gempabumi, wilayah perkotaan Cianjur juga beresiko terhadap penguatan gelombang gempabumi oleh lapisan lunak litologi permukaan. Endapan soil yang cukup tebal di kawasan ini berpotensi menguatkan gelombang ketika terjadi gempabumi. Hasil pemodelan data mikrotremor array di 18 titik ukur diperoleh kecepatan gelombang geser soil berkisar antara 50 m/det. - 308 m/det. Endapan soil ini menumpang di atas batuan vulkanik yang memiliki kecepatan gelombang geser antara 246 m/det – 1415 m/det. Adapun ketebalan soil berdasarkan pemodelan data mikrotremor single station di 189 titik ukur berkisar antara 2 m – 62 m. Nilai faktor penguatan gelombang oleh lapisan soil ini berkisar antara 1 - 2,4 kali dengan zona penguatan tinggi berada di daerah Cugenang, Warungkondang dan Cilaku. Berdasarkan catatan, ketiga wilayah tersebut mengalami intensitas goncangan maksimum sebesar VIIVIII skala MMI. Kata kunci: penguatan gelombang, lapisan lunak permukaan, mikrotremor array, mikrotremor single station. Abstract The Cianjur urban area is exposed to a substantial risk, particularly near the seismic source and due to site amplification, resulting from a soft surface layer. The fairly thick soil deposits potentially amplify seismic waves when an earthquake occurs. According to the microtremor array that was deployed on 18 locations, soil shear wave velocity ranges from 50 m/sec to 308 m/sec. This soil deposit lies above volcanic rock that has shear wave velocities ranging from 246 m/s to 1415 m/s. Single-station microtremor data modelling on 189 sites revealed that the soil thickness varies between 2 m and 62 m. The calculated site amplification of the research area ranges from 1 to 2.4 times, indicating that the Cugenang, Warungkondang, and Cilaku regions have significant amplification zones. Historical records showed that the highest shaking intensity in the three regions ranged from VII to VIII of the MMI scale. Keywords: site amplification, soft surface layer, array microtremor, single station microtremor  
Identifikasi Patahan Lokal Berdasarkan Analisis Data Geomagnet di Dusun Bengle, Desa Dlepih, Kecamatan Tirtomoyo, Wonogiri Rosyida, Hana; Wibowo, Nugroho Budi; Andi, Andi; Niyartama, Thaqibul Fikri; Khoirunnisa, Salma; Jannah, Dea Mutiara; Christalianingsih, Fathunajah Elsa
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 2 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i2.980

Abstract

Penelitian dilakukan di area jalur sesar lokal menggunakan metode geomagnetik di Dusun Bengle, Desa Dlepih, Kecamatan Tirtomoyo, Wonogiri. Wilayah ini merupakan salah satu kawasan yang terletak dekat jalur sesar yang ditandai dengan litologi batu pasir dan fitur geologi yang kompleks, dengan variasi komposisi mineral dan stratigrafi yang dapat mempengaruhi kestabilan tanah. Penelitian ini bertujuan untuk mengidentifikasi jenis sesar lokal di daerah penelitian. Proton Precession Magnetometer (PPM) digunakan untuk mengumpulkan 43 titik data, prosedur pengolahan data melibatkan beberapa penyesuaian terhadap total medan magnet akibat variasi selama pengumpulan data lapangan. Hasil pemodelan 2D mengungkapkan keberadaan jalur sesar yang teridentifikasi pada litologi batu pasir, dengan nilai suseptibilitas sebesar 0,3 x 10-3. Hasil pemodelan menunjukkan adanya variasi jalur sesar dibandingkan dengan peta geologi sebelumnya, dengan orientasi N 107° S. Hasil identifikasi jalur sesar dalam visualisasi 3D menunjukkan struktur geologi yang diidentifikasi sebagai sesar normal, dengan sisi barat daya lebih tinggi dibandingkan dengan sisi timur laut. Kata Kunci: Metode Magnetik, Anomali Medan Magnet, Suseptibilitas, Sesar Lokal, Bengle Abstract The research was conducted on the local fault line area using the geomagnetic method in Bengle Hamlet, Dlepih Village, Tirtomoyo, Wonogiri. This area is located near a fault line characterized by sandstone lithology and complex geological features, with variations in mineral composition and stratigraphy that may affect soil stability. This study aimed to identify the types of local faults in the study area. The Proton Precession Magnetometer (PPM) was used to collect 43 data points. The data processing procedure was involved several adjustments to the total magnetic field due to variations during field data collection. The findings of 2D modeling revealed the presence of recognized fault pathways in sandstone lithology, with a susceptibility value of 0.3 x 10-3. The modeling findings suggest a variation in the fault path compared to the previous geological map, with an orientation of N 107o S. The results of fault path identification in the 3D visualization show the geological structures identified as normal faults with the southwest side higher than the northeast side. Keywords: Magnetic Method, Magnetic Anomaly, Susceptibility, Local Fault, Bengle
Visualisasi Data Elemen Jejak Granitik untuk Analisis Tatanan Tektonik Menggunakan Aplikasi Berbasis Web Febian, Herru Sendia; Ismed, Khaidir
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 4 (2025)
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i4.935

Abstract

Komposisi elemen jejak dari batuan granitik dapat digunakan untuk mengetahui evolusi tektonik batuan. Salah satunya adalah dengan menggunakan unsur Rb, Y, Nb, dan Ta seperti yang dilakukan oleh Pearce dkk. (1984) menggunakan diagram Rb vs (Y+Nb) dan Rb vs (Yb+Ta). Untuk menghasilkan plotting nilai elemen jejak pada diagram diskriminasi, peneliti geokimia menggunakan perangkat lunak desktop (contoh: GCDKit, PetroGraph, GeopyTool, dll.). Namun demikian, software tersebut menghasilkan diagram statis yang memiliki banyak kelemahan fleksibilitas diantaranya yaitu tidak dapat membandingkan beberapa data secara langsung, tidak dapat mengelompokkan data secara langsung dan penggunaan diagram scatter plot yang terbatas. Perangkat lunak geokimia semestinya dapat memberikan keleluasaan bagi ahli geokimia untuk dapat secara fleksibel mangatur visualisasi data sehingga hasil interpretasi yang dihasilkan juga tidak terbatas pada satu visualisasi data saja. Aplikasi berbasis web yang dibangun dengan Node.js, MySQL dan D3.js dapat menampilkan visualisasi diagram Pearce dkk. yang lebih interaktif dan lebih dinamis dengan menggunakan contour density selain penggunaan titik-titik plot. Visualisasi data yang lebih fleksibel pada aplikasi berbasis web dapat membantu ahli geokimia dalam menentukan outlier data, korelasi antar data dan evolusi geokimia dari arah sebaran data yang terlihat lebih jelas. Kata Kunci: granit, analisis data geokimia, diagram diskriminasi tektonik, aplikasi web. Abstract The trace element composition of granitic rocks can be used to determine the tectonic evolution of those rocks. One method involves using the elements Rb, Y, Nb, and Ta, as demonstrated by Pearce et al. (1984) using Rb vs. (Y+Nb) and Rb vs. (Yb+Ta) diagrams. To plot trace element values on discrimination diagrams, geochemical researchers typically use desktop software (e.g., GCDKit, PetroGraph, GeopyTool, etc.). However, these softwares produce static diagrams with several flexibility limitations, such as the inability to compare multiple datasets directly, the inability to group data on the fly, and the restricted use of scatter plots. Geochemical software should ideally provide geochemists with the freedom to flexibly manage data visualization so that interpretations are not limited to a single view. A web-based application built with Node.js, MySQL, and D3.js can display Pearce et al. diagrams that are more interactive and dynamic, utilizing contour density alongside traditional scatter plots. More flexible data visualization in a web application can assist geochemists in identifying data outliers, correlations, and geochemical evolution through more clearly visible data distribution trends. Keywords: granite, geochemical data analysis, tectonic discrimination diagram, web application  
Identifikasi Struktur Patahan Daerah Panas Bumi Gunung Tampomas Berdasarkan Derivative Analysis dan Forward Modelling 2.5D dengan Metode Gravitasi Syarifuddin, Sultan Ahmad; Suharsono, Suharsono; Takodama, Iqbal
Jurnal Geologi dan Sumberdaya Mineral Vol. 27 No. 1 (2026)
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v27i1.945

Abstract

The Mount Tampomas Geothermal Area is located in Sumedang Regency, West Java Province. This study aims to interpret the distribution of subsurface fault structures based on gravity data analysis over an area of 14 × 14 km². Residual gravity anomaly analysis reveals the presence of a low gravity anomaly in the central part of the volcanic edifice, which is interpreted as a low-density zone associated with a magma ascent pathway within the volcanic system. The results of derivative analysis, correlated with surface geological data, indicate the presence of fault structures comprising normal faults, strike-slip faults, and reverse faults, which represent structural patterns predominantly controlled by volcanic activity. Forward modelling applied to several profiles yields the subsurface lithological density distribution, including the Subang Formation (2.40 g/cm³), Kaliwangu Formation (2.35 g/cm³), old volcanic lahar breccia (2.85 g/cm³), undifferentiated volcaniclastic tuffaceous sand (2.55 g/cm³), pumiceous tuff (2.60 g/cm³), breccia and agglomerate (2.70 g/cm³), and young volcanic lava (2.50 g/cm³).The results of this study provide a preliminary characterization of subsurface fault structures in the Mount Tampomas Geothermal Area based on gravity methods. Keywords : Gravity, Geothermal, Tampomas, Derivative Analysis, Forward Modelling
Penentuan Kualitas dan Lingkungan Pengendapan Batubara berdasarkan Nilai Total Abu, Total Air, dan Total Sulphur terhadap Nilai Kalori pada Batubara di Desa Batuah, Kecamatan Loa Janan, Kabupaten Kutai Kartanegara, Provinsi Kalimantan Timur Afrizal Ie, Muhammad; Helman Hamdani, Ahmad; Winantris, Winantris
Jurnal Geologi dan Sumberdaya Mineral Vol. 27 No. 1 (2026)
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v27i1.1079

Abstract

Coal is formed from the accumulation of plant material that undergoes decomposition, compaction, and deposition over millions of years due to physical and chemical influences. This study was conducted in the Kampung Baru Formation, Kutai Basin, to determine quality and depositional environment of coal. Data were obtained from three boreholes (DH-01, DH-02, and DH-03) with having coal thicknesses of 17.8 m, 9.8 m, and 4.8 m, respectively. The analyses performed proximate and ultimate. The results showed that huminite (densinite) was the dominant maceral component with an average of 36.6%, followed by liptinit (cutinite) at 6.8% and inertinite (semifusinite) at 3.03%. The mineral matter content was dominated by pyrite (1.8–6.8%) and clay (0.8–7.6%). The average values of the proximate and ultimate analyses show an ash content of 20.60%, total water of 12.25%, total sulphur of 0.66%, and a calorific value of 4,042.3 cal/g. Based on the United Nations (1998) and ASTM classifications, coal in the study area is categorized as a lignite B to low-medium rank coal. Depositional environment analysis is based on Lamberson diagram classification (1991), which shows that the coal was deposited in a limno-telmatic zone with a lower to upper delta plain facies. Keywords: Coal, Kutai Basin, Kampung Baru Formation, Quality, Depositional Environment, Maceral  

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