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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 482 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  

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