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Jurnal Geosains Terapan (J.Geos T.) is a national journal published twice a year, in February and August, by the Department of Geosciences, Faculty of Mathematics and Natural Sciences, Universitas Indonesia. The Jurnal Geosains Terapan provides opportunities for contributors to present scientific papers in support of or related to earth sciences, including geology, geophysics, physical geography, geodesy, geomorphology, and their applications. The journal will be published in both print and online formats.
Location
Kota depok,
Jawa barat
INDONESIA
Jurnal Geosains Terapan
Published by Universitas Indonesia
ISSN : 2502468X     EISSN : -     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
Jurnal Geosains Terapan (J.Geos T.) is a national journal published twice a year, in February and August, by the Department of Geosciences, Faculty of Mathematics and Natural Sciences, Universitas Indonesia. The Jurnal Geosains Terapan provides opportunities for contributors to present scientific papers in support of or related to earth sciences, including geology, geophysics, physical geography, geodesy, geomorphology, and their applications. The journal will be published in both print and online formats.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 62 Documents
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Analisis Bahaya Gempa Bumi Menggunakan Metode Probabilistic Seismic Hazard Analysis (PSHA) di Pulau Madura, Jawa Timur Tulis, Jessica Stephanie; Sirait, Anne Meylani Magdalena; Supartoyo
Jurnal Geosains Terapan Vol 6 No 2 (2023): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

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Abstract

Gempa bumi berkekuatan 4,8 SR yang terjadi pada 13 Juni 2018 pukul 20.06 WIB di Kabupaten Sumenep, Pulau Madura mengakibatkan 135 bangunan rusak. Usaha mitigasi bencana gempa bumi perlu dilakukan untuk meminimalisir dampak kerusakan dan kerugian jiwa hingga materiil. Salah satu caranya adalah dengan melakukan penelitian mengenai kemungkinan munculnya gempa bumi pada tingkat bahaya tertentu menggunakan metode PSHA (Probabilistic Seismic Hazard Analysis). Nilai PGA terendah pada peta peta periode ulang gempa 2.475 tahun (PoE 2%) hasil penelitian memiliki rentang nilai 0,25 – 0,27 g, sedangkan pada peta milik SNI 1726:2019 memiliki rentang nilai 0,15 – 0,20 g yang keduanya berada di wilayah Kabupaten Sumenep. Nilai PGA pada peta periode ulang gempa 2.475 tahun (PoE 2%) hasil penelitian di Pulau Madura masuk ke intensitas MMI VII (very strong) hingga VIII (severe). Menurut grafik respon SA dalam periode 4 detik di lokasi kejadian gempa 13 Juni 2018, diperlukan revisi kode bangunan nasional SNI 1726:2019 dari percepatan tanah spektral tertinggi 0,45 g menjadi 0,61 g.
Identification of Shallow Aquifer Zone Using Vertical Electrical Sounding (VES) Method with Schlumberger Array. Case Study: Universitas Indonesia Rustriandayani, Yuannisa; Valencia, Ayunda Aulia; Fadia , Tsabita Rasyda
Jurnal Geosains Terapan Vol 6 No 1 (2023): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

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Abstract

This study aims to identify shallow aquifers in Universitas Indonesia (UI). Fifteen vertical electrical sounding (VES) surveys were conducted using the Schlumberger array. The apparent resistivity from VES measurements was interpreted using curve matching inversion to obtain depth, thickness, and resistivity of subsurface layers, which is then compared with the literature and lithology log from boreholes. The result shows that subsurface layers in the study area consist of clay, sand, and silt. Sand layers are interpreted as aquifers because they have higher porosity and permeability than clay and silt layers. In addition, sand layers exhibit a resistivity range (< 300 Ωm) similar to other studies. Sand aquifers can be found at shallow depths (min 0.5 m) along the Northwest and Southeast of the study area. The sand aquifers are thicker within the campus than in the forest area (up to 12 m). This information is important in decision-making regarding groundwater search and utilisation in the UI area.
The Limestone Diagenesis in The Bojongmanik Formation Based on Petrographic Analysis Sani, Yogie; Astuti, Tri Rani Puji; Indra, Tito Latif
Jurnal Geosains Terapan Vol 6 No 1 (2023): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

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The Bojongmanik Formation is a deposit belonging to the Banten Block, has an age range from Middle Miocene toearly Pliocene, and is interspersed with sandstone, marl, shale claystone, and limestone (Sudana and Santosa, 1992).The limestone members of the Bojongmanik Formation are limestones containing mollusks with age equivalent to theMiddle Miocene (Efendi, 1998). This research aims to know the microscopic labeling. This diagenetic process workson the limestone in the Bojongmanik Formation to know the stages of diagenesis and the relationship between thediagenetic process and the porosity of the limestone. The method used in this research is petrographic analysis. Basedon the results of research from 15 samples of thin incisions of the Bojongmanik Formation, there are three types oflimestone: packstone limestone, floatstone limestone, and wackestone limestone, which undergo a process ofdiagenetic cementation, dissolution, neomorphism, microbial micritization, and compaction. The depositionalenvironment of the limestone diagenesis of the Bojongmanik Formation is in the marine phreatic, burial, meteoricphreatic, and meteoric vadose environments. The dominant porosity was found to be vuggy and intraparticle types.One factor that influences the process of diagenesis is the formation of secondary porosity in limestone. The lowerporosity value indicates that there is a little dissolving effect. The higher porosity value indicates much dissolving inthe phreatic zone.Keyword: The Bojongmanik Formation, Petrography Analysis, Porosity, Limestone Diagenesis
Studi Longsor Berbasis Kecerdasan Buatan: Sebuah Tinjauan Widodo Kristyanto, Twin Hosea; Wusqa, Urwatul; Destyanto, Twin Yoshua Raharjo; Pandjaitan, M.M. Lanny W.; Lukas
Jurnal Geosains Terapan Vol 6 No 2 (2023): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

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Abstract

Tanah longsor masih menjadi topik hangat dalam diskusi bencana geologi, termasuk Indonesia. Berbagai metode, termasuk Artificial Intelligence (AI), digunakan untuk melakukan pengembangan penelitian tentang topik tanah longsor. Oleh karena itu, makalah ini bertujuan untuk menyajikan tinjauan komprehensif studi longsor berbasis AI yang berfokus pada area aplikasi tertentu, metode rekayasa fitur (FEM), dan sumber Digital Elevation Model (DEM) yang digunakan dalam penelitian. Penelitian ini menggunakan metode kualitatif dengan pendekatan tinjauan sistematis terhadap studi longsor terkini (2012-2022) yang diteliti secara sistematis dalam suatu sintesis. Eksplorasi menghasilkan 26 makalah dari jurnal atau prosiding terindeks nasional dan internasional, yang disaring menjadi 12 artikel yang membahas atau menyebutkan area aplikasi tertentu, FEM, dan sumber DEM. Analisis menunjukkan bahwa aplikasi AI dalam studi longsor didominasi untuk pemetaan kerentanan longsor dan masih sedikit untuk aplikasi lain. Hal ini juga menunjukkan bahwa hampir semua studi longsor berbasis AI memilih SRTM sebagai sumber DEM. Mengenai FEM, hanya lima artikel yang membahas pemilihan faktor longsor yang penting. Ada empat FEM yang digunakan dalam studi tersebut, yaitu deduksi variabel, model faktor kepastian, algoritma C.45, dan peringkat kepentingan variabel. Dari analisis mendalam terhadap 13 artikel tersebut, dapat disimpulkan bahwa studi longsor berbasis AI di Indonesia masih perlu dikembangkan alih-alih berfokus pada pemetaan kerentanan longsor saja. Studi untuk menemukan faktor longsor yang efektif dan sumber daya DEM yang kompatibel menggunakan AI juga dapat menjadi peluang baru bagi para ahli longsor.
Pemodelan Metode Resistivitas 4D untuk Identifikasi Penyebab Longsor di Wilayah Asrama Kampus Lapangan Geologi Karangsambung Fahira, Azelia Maudine Khadijah; Iskandarsyah; Kuswanto, Agus; Abdulah, Junaedi
Jurnal Geosains Terapan Vol 6 No 2 (2023): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

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Abstract

Tanah longsor di Asrama Kampus Lapangan Geologi Karangsambung mulai Agustus - November 2022 menyebabkan tembok bergeser hingga membelok. Pada Agustus 2023, pergeseran tembok sekitar 1,5 meter kembali terjadi pada zona yang mengalami longsor sebelumnya. Litologi di bawah permukaan didominasi batulempung yang tidak dapat mengalirkan air tanah. Pengamatan sumur pompa menunjukkan naiknya muka air tanah setelah penyedotan, menandakan kandungan air tinggi di bawah permukaan, yang dapat disebabkan oleh curah hujan ringan yang berkepanjangan. Pergerakan air tanah perlu dimodelkan untuk mengidentifikasi arah aliran air dari resapan hujan ke bawah permukaan. Pemodelan metode resistivitas 4D sebanyak 4 kali dan jarak waktu 3 jam menunjukkan air hujan meresap pada lapisan tanah timbunan, menyebar ke arah timur, selatan, dan barat laut. Air dari selatan dan timur mengalir ke tenggara kedalaman 4 – 20 meter, sementara dari barat laut menuju kedalaman 8 – 23 meter. Air terperangkap di atas bidang gelincir lempung lanauan, terutama di tenggara yang mendekati zona longsor. Curah hujan ringan berkepanjangan terjadi 14 kali dari Januari - November 2022, dengan puncaknya pada 13 - 17 Juli 2022 sebesar 22,65 mm/hari. Dengan demikian, penyebab tanah longsor di daerah penelitian adalah air resapan hujan ringan berkepanjangan yang mengalir ke bawah zona longsor dan terperangkap pada bidang gelincir lempung lanauan.
Application of Electrical Resistivity Method with Peak and Flat Base Electrodes to Detect A Potential Water Leakage Underneath A Water Pool in Kiara Payung, Sumedang, West Java Azizah, Mutiara Nurul; Valencia, Ayunda Aulia; Kuswanto, Agus
Jurnal Geosains Terapan Vol 6 No 2 (2023): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

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This study aims to detect potential leakage underneath a water pool made of concrete using the electrical resistivity method with peak and flat base electrodes. Peak electrodes cannot be used on hard materials such as concrete because they can damage the concrete structure, while flat base electrodes can be used without causing any damage to the structure. This study was performed using a single profile, along which electrical resistivity measurements were conducted with different electrode combinations: all peak electrodes, a combination of peak and flat base electrodes, and all flat base electrodes. The maximum profile length was 117.5 meters with a spacing between electrodes of 2.5 meters and using a total of 48 electrodes. The measured apparent resistivity was inverted using the least-square and robust constraint inversion methods to obtain 2D true resistivity sections. An analysis of the 2D sections was conducted based on the resistivity profile, model errors, and ability to resolve the water pool geometry. The results show that the inverted model using the robust constraint method with flat base electrodes has the best result, which exhibits a clear boundary between the water pool and its surrounding soil, has a smaller error, and is able to resolve the water pool geometry compared to other models. This inversion result indicates no leakage occurs underneath the water pool. Therefore, the electrical resistivity method using flat base electrodes can be used for long-term maintaining the water pool in the study area and should be used in other geoelectric resistivity studies on hard surfaces.
Anisotropy of magnetic susceptibility: Application to tectonics and basin evolution Syahputra, Reza
Jurnal Geosains Terapan Vol 6 No 2 (2023): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

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Abstract

The anisotropy of magnetic susceptibility (AMS) was proposed over half a century ago and has earned tremendous popularity. The AMS method is a powerful quantitative tool for fabric analysis, especially in fine-grained sedimentary rocks that lack macroscopically observable paleocurrent indicators. In addition, the AMS has proven as an extremely sensitive indicator to record ‛invisible’ deformational fabrics. Thus, the AMS is increasingly used to characterize the preferred orientation of magnetic minerals from depositional to tectonic setting within a given basin, with the benefit of potentially recording weak upper-crustal strains. The AMS was tested in a sequential geological setting along the northern edge of Gondwana during the Neoproterozoic–Cambrian. The objective of this research is to find the timing and mechanism operated on the northern margin of Gondwana during active-pasive margin transition. In the Cadomian terranes, after the active Cadomian orogeny ceased, several diverse compositional plutons intruded the Teplá–Barrandian unit of the Bohemian Massif. The AMS data are able to differentiate the pre-, syn-, and post-plutonism structures (The Kdyně pluton, the Czech Republic). The possible geodynamic causes of this event were interpreted as a result of a slab break-off. Following this plutonism, the crust at the surface evolved as a graben-type structure of the Příbram–Jince basin (the Czech Republic). The AMS has successfully revealed the paleocurrent direction changes in this sedimentary basin, which was related to the change of tectonic regime.
Microstructure Influence on Rock Electrical Properties: Integration of Laboratory and Numerical Methods Mustofa, Muhammad Bisri; Wicahyanto, Aditya A.; Mahfuziahaq, Firda; Supriyanto, Supriyanto
Jurnal Geosains Terapan Vol 7 No 1 (2024): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64986/jgt.v7i1.116

Abstract

The electrical properties of rocks are widely used in characterizing reservoir rocks due to their ability to identify porosity, fluid types, and saturation levels. This study aims to determine the effect of microstructure on the electrical properties of Ngrayong Formation rocks through laboratory measurements and numerical calculations. Twelve samples from three-grain size categories with porosity ranges of 34-48% were prepared for resistivity measurements under partially and fully brine-saturated conditions using a 6% NaCl solution. Scanning results of the three categories revealed that grain size influences the microstructure of rocks, including the distribution of grain size and pore size. The estimated electrical properties show that at low saturation, microstructure significantly affects resistivity response. Conversely, at high saturation, variations in microstructure tend to result in uniform resistivity, indicating minor microstructural influence on high-saturation electrical property estimations. Additionally, Archie parameters were determined with ranges of 2.1-3.4 for the cementation exponent and 1.2-2.4 for the saturation exponent. A strong correlation was also observed between laboratory measurements and numerical calculations, especially for samples with small grain sizes. This study provides a deeper understanding of the electrical properties of rocks as a function of their microstructure, which can serve as a base for interpreting electrical data from Routine/Special Core Analysis, resistivity log data, or field resistivity data in Applied Geophysics.
Identifikasi Zona Potensi Air Tanah Menggunakan Metode Sistem Informasi Geografis (SIG) dan Analytical Hierarchical Process (AHP) di Cekungan Air Tanah (CAT) Sumbawa Besar, Provinsi Nusa Tenggara Barat Simanjuntak, Nozzel Seagal; Wusqa, Urwatul; Syahputra, Reza
Jurnal Geosains Terapan Vol 7 No 1 (2024): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64986/jgt.v7i1.118

Abstract

Cekungan Air Tanah (CAT) Sumbawa Besar, merupakan cekungan air tanah yang terletak di Kabupaten Sumbawa, Nusa Tenggara Barat. Daerah ini termasuk dalam wilayah tanggap darurat bencana kekeringan di Nusa Tenggara Barat, pada musim kemarau tahun 2023, sehingga dilakukan penelitian untuk mengidentifikasi zona potensi air tanah di wilayah ini. Penelitian ini menggunakan metode Sistem Informasi Geografis (SIG) dan Analytical Hierarchical Process (AHP). Metode SIG digunakan untuk analisis parameter menjadi bentuk peta, sedangkan metode AHP digunakan untuk menentukan tingkat kepentingan parameter serta pembobotannya. Terdapat 12 parameter yang digunakan dalam penelitian, yang dianggap mempengaruhi potensi air tanah, yakni geologi, geomorfologi, tutupan lahan, densitas kelurusan, jenis tanah, densitas drainase, kemiringan lereng, curah hujan, Topographic Wetness Index (TWI), roughness/kekasaran, Topographic Position Index (TPI), dan curvature/kelengkungan. Berdasarkan penggabungan seluruh parameter, dibuatlah peta zona potensi air tanah yang dibagi menjadi 3 kategori, yakni zona potensi air tanah rendah, mencakup sekitar 18% dari area penelitian, zona potensi air tanah sedang, mencakup sekitar 68% dari area penelitian, dan zona potensi air tanah tinggi, mencakup sekitar 14% dari area penelitian. Dari peta zona potensi air tanah, dapat disimpulkan bahwa zona potensi air tanah pada Cekungan Air Tanah Sumbawa Besar didominasi oleh zona potensi air tanah sedang, dengan sebagian kecil area berada pada zona rendah dan zona tinggi. Hasil perbandingan antara peta zona potensi air tanah dengan data lapangan menunjukkan hasil yang cukup baik, peta memiliki tingkat akurasi 78% terhadap data debit air sumur bor serta 85% terhadap luas daerah termasuk wilayah tanggap darurat bencana kekeringan.
Korelasi Nilai Standard Penetration Test (SPT) dan Cone Penetration Test with Pore Pressure Measurement (CPTu) untuk Estimasi Daya Dukung Tanah di Kota Batam, Kepulauan Riau Rahmadian, Firli; Oktavioni Indraswari, Asri; Wusqa, Urwatul
Jurnal Geosains Terapan Vol 7 No 1 (2024): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64986/jgt.v7i1.120

Abstract

Penelitian ini menganalisis hubungan antara hasil uji SPT dan CPTu untuk estimasi daya dukung tanah (qa) di daerah dengan litologi Formasi Semarung dan Pancur, yang terdiri atas batupasir arkosik, batulempung, batuserpih, dan konglomerat. Data terdiri dari 20 titik uji SPT dan 14 titik uji CPTu, masing-masing pada tiga kedalaman sejajar. Nilai qa dihitung dari N-SPT menggunakan rumus Bowles, kemudian dikorelasikan secara linier dengan parameter CPTu, yaitu tahanan ujung konus (qc) dan hambatan selubung (fs). Sebanyak 30 pasang sampel digunakan untuk analisis, dibagi menjadi 24 pasang untuk korelasi dan 6 pasang untuk validasi. Hasil menunjukkan bahwa korelasi qc terhadap qa memiliki koefisien determinasi (R²) 0,7302 dengan akurasi 90% (MAPE 10%), sedangkan fs terhadap qa memiliki R² 0,7169 dengan akurasi 87% (MAPE 13%). Model terbaik (qc–qa) digunakan untuk menghitung daya dukung seluruh titik CPTu dan digabungkan dengan hasil SPT dalam peta sebaran daya dukung. Hasilnya menunjukkan variasi nilai yang dipengaruhi oleh kondisi geologi seperti jenis litologi, topografi, dan kedalaman.

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