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All Journal Bulletin of Scientific Contribution : Geology POSITRON Techno: Jurnal Penelitian Journal of Engineering and Technological Sciences Phi : Jurnal Pendidikan Fisika dan Terapan Jurnal Spektra Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) JPSE (Journal of Physical Science and Engineering) Jurnal Penelitian Pendidikan IPA (JPPIPA) BULLETIN OF THE MARINE GEOLOGY Spektra: Jurnal Fisika dan Aplikasinya Al-Tazkiah : Jurnal Bimbingan dan Konseling Islam JURNAL TEKNIK PATRA AKADEMIKA PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Jurnal Material dan Energi Indonesia
Eleonora Agustine
Departemen Geofisika Fakultas MIPA Universitas Padjadjaran, Jalan Raya Bandung Sumedang Km 21, Hegarmanah, Jatinangor, Sumedang, Jawa Barat 45361, Indonesia.
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Physics Social Sciences Other

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Journal : Journal of Engineering and Technological Sciences

 1 
Three-dimensional DC Resistivity Modeling using Galerkin Finite Element Method Composed by Tetrahedral Elements Srigutomo, Wahyu; Anwar, Hairil; Agustine, Eleonora; Mahardika, Harry
Journal of Engineering and Technological Sciences Vol 51, No 4 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (768.912 KB) | DOI: 10.5614/j.eng.technol.sci.2019.51.4.5

Abstract

Successful interpretation of DC resistivity data depends on the availability of a proper forward modeling scheme. In this study, a three-dimensional DC resistivity forward modeling scheme was developed using the finite element method. The finite element equations were obtained using a weakened form of the weighted-residual method called the Galerkin method. Discretization of the modeling domain was carried out by dividing it into smaller three-dimensional blocks and subdividing each block into five tetrahedral elements. A linear interpolation function was employed and elemental linear equations were set up, followed by formation of global matrix systems of equation and incorporation of proper boundary conditions. The conjugate gradient method was applied to solve the global system of equations, which in this study was proven to be more efficient than a direct solver, contributing to a 67% time reduction. Using a Wenner array configuration, comparison with theoretical calculation of the electric potential for a homogeneous model yielded a relative error of 3.66%. To confirm the applicability of this forward modeling scheme, apparent resistivity profiles for several basic three-dimensional subsurface resistivity models were compared with the analytical profiles, yielding an acceptable level of fitting.
Three-dimensional DC Resistivity Modeling using Galerkin Finite Element Method Composed by Tetrahedral Elements Wahyu Srigutomo; Hairil Anwar; Eleonora Agustine; Harry Mahardika
Journal of Engineering and Technological Sciences Vol. 51 No. 4 (2019)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2019.51.4.5

Abstract

Successful interpretation of DC resistivity data depends on the availability of a proper forward modeling scheme. In this study, a three-dimensional DC resistivity forward modeling scheme was developed using the finite element method. The finite element equations were obtained using a weakened form of the weighted-residual method called the Galerkin method. Discretization of the modeling domain was carried out by dividing it into smaller three-dimensional blocks and subdividing each block into five tetrahedral elements. A linear interpolation function was employed and elemental linear equations were set up, followed by formation of global matrix systems of equation and incorporation of proper boundary conditions. The conjugate gradient method was applied to solve the global system of equations, which in this study was proven to be more efficient than a direct solver, contributing to a 67% time reduction. Using a Wenner array configuration, comparison with theoretical calculation of the electric potential for a homogeneous model yielded a relative error of 3.66%. To confirm the applicability of this forward modeling scheme, apparent resistivity profiles for several basic three-dimensional subsurface resistivity models were compared with the analytical profiles, yielding an acceptable level of fitting.
Curie Point Depth Analysis of Lesugolo Area, East Nusa Tenggara, Indonesia Based on Ground Magnetic Data Alamta Singarimbun; Umar Said; Dini Andriani; R. B. Astro; Bakrun Bakrun; I G. P. F. Soerya Djaja; Eleonora Agustine; Pepen Supendi; Wahyu Srigutomo
Journal of Engineering and Technological Sciences Vol. 54 No. 1 (2022)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2022.54.1.11

Abstract

The Curie point depth, or magnetic basal depth, of the Lesugolo geothermal area in Ende, Flores Island, East Nusa Tenggara, Indonesia was estimated by performing spectral analysis on spatial magnetic data and transforming it into the frequency domain, resulting in a link between the 2D spectrum of magnetic anomalies and the depths of the top and centroid of the magnetic sources. Shallow Curie point depths of 16 to 18 km were found in the north-northeast to southeast areas of Lesugolo, while deeper depths of 24 to 26 km were found in the southwest. The tectonic setting beneath the central part of Flores Island governs the distribution of the Curie point depths in the area. Shallow Curie point depth zones are associated with high thermal gradients (30 to 34 °C/km) and heat flow (80 to 100 mW/m2). Deep depths, on the other hand, correspond to zones of low thermal gradient (21 to 26 °C/km) and low heat flow (65 to 80 mW/m2). Both the derived thermal gradient and the heat flow maps contribute to a better understanding of the Lesugolo geothermal system’s configuration. This study suggests that the Lesugolo geothermal area’s prospect zone is located in the center of the investigated area, where the Lesugolo normal fault forms its southeastern boundary.
Co-Authors Achmad Wahyu Pratama Adinda Syifa Azhari Agum Gumelar Prakoso Aji, Bayu Gusti Pangestu Alamta Singarimbun ANGELINA DAKOSTA Anwar, Hairil AZIZAH, DARIN NUR Bakrun Bakrun Bambang Wijatmoko Budianto, Muhammad Abdillah Budiono, Kharisma Asmarani Budy Santoso BUNAIYA RIZKY BALEY CHELSEA SUCIATI NOVIANDRI KUSNAEDI Daffa Dzakwan Shiddiq Dini Andriani Dini Fitriani Dini Fitriani Dini Fitriani Dini Fitriani Dini Fitriani Dini Fitriani Dini Fitriani, Dini Donita, Fataya Tasya Eddy Supriyana Ekklesia, Epiphani ERIN WULAN MAGDALENA FATHIRIZQI FAWWAZ HYANI Fathurrohman, Fahmy FILDZA NURFAJRINA SUGANDA FINA FERINA INTANIA FIRDA HANAN BAHJAH HAFIZH AIM ZUFAR Hairil Anwar Hapsoro, Cahyo Aji Harry Mahardika HILMY REY HANZYAD SRIGUTOMO I G. P. F. Soerya Djaja Ibrahim, Alpan Imam Setiadi Imran Hilman Mohammad Indriana, Rina Dwi Juniarti, Nita Kartika H. Kirana Kartika H. Kirana, Kartika Kartika Hajar Kirana Kartika Hajar Kirana Kartika Hajar Kirana Kartika Hajar Kirana, Kartika Hajar Ladaya A. Rakhmawati Luh Ayu Eka Safitri Septiana Maarif, Syaiful Mahardika, Harry MAHYANA MAIRUBI KENCANA Manurung, Dwi Putri K Mariyanto Mariyanto Mechdi Ghazali Mentari, Vanessa Zian Mia Uswatun Hasanah MICHELLE LAURA FERDIANA Mimin Iryanti Mokhamad Rizki Ramdhani Muhamad Gina Nugraha MUHAMMAD ADHITYA NUGRAHA Mulyadi, Yudi MULYANA, ACHMAD ARIF NANDIRA PUTRI KAERUDIN Nawawi, Muhamad Rovie Nico Andrianto, Nico Novala, Gesti Cita Nugroho, Amira Sasanti Nurfaradila, Fina Pepen Supendi Prameswary, Cevilla Amalia Pranatikta, Krishna Agra Putri, Amira Sasanti Nugroho Putri, Bilqis Aulia Rahma Andini Pratiwi Rahmaputri, Maghfira Dwivani Rahmawati, Nabilah RAYHAN SALPA YUSUF Rhistanto Faturohman Suhanto Richardo Barry Astro Rifai, Mochamad Khoirul Rifki Nur Priyansyah Riski Darmasetiawan RIZAL NUR FEBRIAN Rizkita, Nabila Risty RIZKY RIYADI RAMADHAN Rohman, Muhammad Alkuansinta Saeful Ihsan, Muhammad Raihan Sartono Septiani, Fadia Tri Shafaria, Mileani Shaska Zulivandama Silvia Jannatul Fajar Siti Zulaikah Susilawati, Anggie Tama, Petrus Ardi Trimadona Trimadona Tumpal Bernhard Nainggolan Umar Said Wahyu Srigutomo Widya Utami Yudi Rosandi Zaenudinna, Rayna Aulia