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All Journal JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI Journal of Science and Applicative Technology Science and Physics Education Journal (SPEJ) Navigation Physics : Journal of Physics Education International Journal of Hydrological and Environmental for Sustainability Makara Journal of Science Jurnal Riset Fisika Indonesia Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Siregar, Rahmat Nawi
Department Of Physics, Institut Teknologi Sumatera
Agriculture, Biological Sciences & Forestry Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics Other

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Identification of Underground Rivers Using Very Low Frequency Electromagnetic and Graphical User Interface Matrix Laboratory: Implications for Groundwater Exploration Umam, Rofiqul; Sismanto, Sismanto; Umar, Emi Prasetyawati; Siregar, Rahmat Nawi; Maula, Frida Yassar; Takahashi, Hirotaka
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 14 No 2 (2025): Jurnal Ilmiah Pendidikan Fisika Al-Biruni
Publisher : Universitas Islam Negeri Raden Intan Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/jipfalbiruni.v14i2.27746

Abstract

The research aims to detect underground rivers using 2D mapping and minimal-noise data. In this research, 2-dimensional (2D) mapping of underground rivers in karst areas was carried out using the geophysical method of very low-frequency electromagnetic waves, namely VLF-EM (Very Low Frequency Electromagnetic Method). Electromagnetic wave analysis is based on differences in object frequencies, which reflect subsurface resistivity and conductivity and are captured by the VLF-EM detector. The measurement results were analyzed using three filter equations (Moving Average, Fraser, and Karous H-Jelt) and the Graphics User Interface Matrix Laboratory (GUI-MatLab) Software. Apart from that, the use of GUI-MatLab aims to create VLF-EM data processing software that is better for 2D interpretation display and more efficient in processing (requiring data entry only once). The research area was located in the karst rock area of Gunung Kidul Regency, Yogyakarta, Indonesia, at coordinates 8.020°S and 110.36°E. The VLF-EM measurements and GUI-MatLab interpretation detected the presence of underground river flow crossing three villages in the study area (Timun Sari, Mojo Sari, and Peyuyon), with accurate results (conductive objects were easily distinguished). Therefore, based on this study, it is recommended that productive boreholes be drilled in the 3 villages where VLF measurements were taken. The productive borehole drilling is recommended in 3 villages.
Identification of Subsurface Structures Using Topex Altimetry Satellite Gravity Data: Implications for Preliminary Surveys of Geothermal Existence Dwi Anggraeni; Rahmat Nawi Siregar; Sismanto Sismanto
International Journal of Hydrological and Environmental for Sustainability Vol. 2 No. 2 (2023): International Journal of Hydrological and Environmental for Sustainability
Publisher : CV FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/ijhes.v2i2.261

Abstract

Bangka Island is on the Sunda Shelf (Eurasian tectonic plate) and the outer part of the Sumatra basin. Plate tectonic activity results in fault structures and forms the statigraphy of rock formations such as Alluvium, Ranggam, Klabat Granite, Tanjung Genting, and the Pemali Complex. The fault structure was identified as a control structure for the radiogenic geothermal system. Radiogenic geothermal heat originates from the decay of radioactive elements in granite rocks (Klabat Granite formation) on Bangka Island. The purpose of this research is as a preliminary survey of the presence of Slag and Cracker geothermal energy on Bangka Island using the gravity method. The research data used is secondary data obtained from the Topex satellite (Topography Experiment). The results of the modeling show that many fault structures in the study area are found around the Slag and Cracking geothermal manifestations. The fault structure is also accompanied by a breakthrough by the lower layer of rock into the rock above it. So that the fault structure can control the Slag and Crack radiogenic geothermal system.
Analysis of Subsurface Faults Using 3D Gravity Method Based On Satellite Image Data: Insights into Indo-Australian and Eurasian Plate Subduction in the Formation of An Accretionary Prism Kadek Ciptani Satria Dewi; Rahmat Nawi Siregar; Trisna Ikhsan Ningati; Zumaida Nur Pulungan; Agapetalia Indriyawati; Hirotaka Takahashi
International Journal of Hydrological and Environmental for Sustainability Vol. 4 No. 3 (2025): International Journal of Hydrological and Environmental for Sustainability
Publisher : CV FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/ijhes.v4i3.960

Abstract

This geophysical study employs the gravity method to analyze subsurface fault structures in the Simeulue Island region. The area lies within an active tectonic zone where the Indo-Australian Plate subducts beneath the Eurasian Plate, making it a critical site for understanding subduction dynamics and accretionary prism formation. Secondary gravity and topographic data were acquired from TOPEX satellite imagery. The primary objective is to identify gravity anomalies and delineate subsurface geological features such as faults, folds, and fractures based on variations in the Earth's gravitational field caused by density contrasts between rock units. The gravity method is particularly effective due to its sensitivity to such density differences. Qualitative interpretation was conducted using Surfer 16, while quantitative modeling utilized Oasis Montaj. Results reveal high Bouguer anomaly values in the southwest, corresponding to the plate convergence zone, and low anomaly values extending from the southeast to northwest, associated with the accretionary prism. The 2D model illustrates the subduction of oceanic crust with a density of 3.43 g/cm³ beneath continental crust with a density of 2.67 g/cm³. The 3D model further reveals that subduction becomes evident at a depth of approximately 16.11 km, with the crustal thickness in the accretionary prism zone reaching around 19.92 km. The 3D approach provides a more comprehensive spatial visualization of the subduction geometry and density distribution, offering insights that surpass conventional 2D analysis. These findings contribute to a deeper understanding of regional geodynamics and may serve as a reference for seismotectonic studies and disaster mitigation efforts in the surrounding area.
Co-Authors Agapetalia Indriyawati Ahmat Munawir Siregar Al Farishi, Bilal Alamta Singarimbun Berlian, Fitra Dwi Anggraeni Endah Kinarya Palupi Hirotaka Takahashi Ikah N. P. Permanasari Iqbal, Mochamad Iqbal, Mochamad Irzaman, Irzaman Kadek Ciptani Satria Dewi Khusnul Yakin Maria Evalina Purba Maula, Frida Yassar Maya Efiarni Eka Putri Mochamad Iqbal Muhamad Ragil Setiawan Muhamad Ragil Setiawan Palupi, Endah Kinarya Prasetyawati Umar, Emi puspitarum, deska lismawenning Putri, Maya Efiarni Eka Rofiqul Umam Rohim, Miftahul Singarimbun, Alamta Sismanto Sismanto Sismanto Sismanto Takahashi, Hirotaka Trisna Ikhsan Ningati Vico Luthfi Ipmawan Widodo Budi Kurniawan Yakin, Khusnul Zumaida Nur Pulungan