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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

Siregar, Rahmat Nawi

Department Of Physics, Institut Teknologi Sumatera

Author-ID : 3888008

Agriculture, Biological Sciences & Forestry Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics Other

Published : 9 Documents Claim Missing Document

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Articles

Analisa Produksi Panas Radiogenik, Densitas dan Kecepatan Seismik dari Singkapan Batu Granit Panas Bumi Nyelanding, Bangka Selatan Rahmat Nawi Siregar; Maria Evalina Purba; Ahmat Munawir Siregar
SPEJ (Science and Physic Education Journal) Vol 3 No 2 (2020): SPEJ (Science and Physic Education Journal)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

The purpose of this study was to determine the analysis of radiogenic heat production, density and seismic velocity of the outcrops of the South Bangka Nyelanding geothermal rock. The X-ray Fluorescence (XRF) method is applied to obtain heat-carrying radioactive elements in the form of Uranium, Thorium and Potassium and other oxides which are useful for studying seismic density and velocity. The main oxides used in this study were SiO2, TiO2, Al2O3, MgO, CaO, K2O and P2O5. The results showed that the density increased from the composition of the mineral felsic (acid) - mafic (base). Conclusion, as for the relationship with heat production, the SiO2 and P2O5 elements experienced a significant decrease compared to other oxides. As for seismic velocity, the results show that seismic velocity has a strong correlation with density. Keywords: Radiogenic Heat Production, Seismic Velocity, Density, Oxides

Kandungan Mineral dan Struktur Kristal Batu Sekis Muhamad Ragil Setiawan; Rahmat Nawi Siregar
SPEJ (Science and Physic Education Journal) Vol 4 No 1 (2020): SPEJ (Science and Physic Education Journal)
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/spej.v4i1.1513

This study aims to determine the mineral content and crystal structure of schist rocks in South Lampung. The method used in this research is the X-ray diffraction method to see the lattice parameters and the crystal structure of the schist rocks. Based on data processing, information was obtained that two main minerals were found, namely quartz and albite minerals. In conclusion, the Albit minerals found in the two samples of rock crystal schists in South Lampung have the same crystal structure and lattice parameters, while the quartz minerals from the two samples have different crystal structures and lattice parameters. Keywords: Lampung, Schis, XRD, Crystal Structure

Determining Soft Layer Thickness Using Ambient Seismic Noise Record Analysis in Kota Baru, South Lampung Ipmawan, Vico Luthfi; Permanasari, Ikah N. P.; Siregar, Rahmat Nawi
Makara Journal of Science Vol. 23, No. 1
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

The local site effect of an earthquake can be calculated through an analysis of short period ambient noise, known as microtremors. The fundamental frequency and amplification factors can be identified by analyzing microtremors using the Horizontal to Vertical Spectral Ratio (HVSR) method. This information can then be used to determine the thickness of the soft layers of sediment. This study analyzed microtremor recordings made in Kota Baru, South Lampung. The amplification factor range according to the HVSR method was 2.3 to 6.17, and the fundamental frequency range was 0.56 Hz to 1.46 Hz. Some spectrums exhibit two peaks with f0 > f1. We suggest that these locations have two layers with significant impedance contrast, which aligns with the geological conditions. The center of the Kota Baru area, especially the region around T11 and T15, has a thicker soft layer than the outskirts; in the central area, the soft layer is approximately 85 to 102 meters thick. The western part of the analyzed area has a shallower soft layer of about 32 to 46 meters. The analysis indicates that the western part has less amplification because it is shallower than the other parts of the analyzed region.

ANALISIS POTENSI LIKUIFAKSI DI DAERAH SERANGAN BALI SELATAN MENGGUNAKAN METODE PROBABILISTIK DAN METODE GROUND PENETRATING RADAR (GPR) Maya Efiarni Eka Putri; Rahmat Nawi Siregar; Alamta Singarimbun
Jurnal Riset Fisika Indonesia Vol 1 No 2 (2021): Juni 2021
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Likuifaksi dapat mengakibatkan kerusakan tanah secara fisik dan menimbulkan potensi korban jiwa lebih besar. Pulau Bali Selatan merupakan salah satu daerah destinasi wisata dan memiliki potensi likuifaksi cukup tinggi dikarenakan kondisi tanah dan tingginya potensi gempabumi. Pada penelitian analisis potensi likuifaksi di daerah Serangan, Bali Selatan dilakukan dengan menggunakan metode probabilistik dan metode ground penetrating radar (GPR). Penelitian ini bertujuan untuk mendapatkan informasi lapisan dangkal bawah permukaan, penurunan tanah akibat gempabumi secara teoritis, dan probabilitas kejadian likuifaksi di daerah Serangan, Bali Selatan dengan mempertimbangkan beberapa parameter yaitu gempabumi Bali (2020) dan gempabumi Lombok (2018). Data GPR diolah menggunakan software ReflexW 7.0 dan data probabilistik diolah menggunakan software Microsoft Excel 2010. Hasil penelitian probabilistik dan GPR menunjukkan keberadaan muka air tanah pada kedalaman ± 2 m serta probabilitaskejadian likuifaksi sebesar 92.22% dengan percepatan tanah sebesar 0,5749 gal di kedalaman 3,5 m yang berjarak 10 km dari episenter akibat gempabumi dengan magnitudo 7,7. Kata kunci: Muka Air Tanah; Penurunan Tanah; Probabilitas; Software ReflexW 7.0.

Mineral analysis in rocks using XRD and Petrography Muhamad Ragil Setiawan; Mochamad Iqbal; Rahmat Nawi Siregar
Journal of Science and Applicative Technology Vol 2 No 1 (2019): ICoSITeR Special Edition
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Rock formation in a region is influenced by many factors such as tectonic and volcanic systems of the area. Both activities will affect the microstructure of the rock. This study analyzes mineral composition in three different rocks. We display the digital image that obtained from XRD and petrography. Rock samples were taken from some formations around Lampung. The analysis was performed on three different rocks: granite, andesite, and schist using XRD and petrography. The granite-R1 sample shows the result of mineral content present in the rock that is quartz, alkali feldspar, plagioclase, biotite. The andesite-R2 sample consists of plagioclase, orthopyroxene, biotite, and volcanic glass. The Schist-R3 sample consist of quartz, muscovite, calcite.

Identification of Subsurface Structures Using Topex Altimetry Satellite Gravity Data: Implications for Preliminary Surveys of Geothermal Existence Anggraeni, Dwi; Siregar, Rahmat Nawi; 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

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.

Magnetic data analysis using 2D inversion: A case study from Terak Radiogenic Geothermal area, Bangka Island, Indonesia Siregar, Rahmat Nawi; Rohim, Miftahul; Permanasari, Ikah Ning Prasetiowati; Puspitarum, Deska Lismawenning; Umam, Rofiqul
Navigation Physics : Journal of Physics Education Vol 7, No 1 (2025): Navigation Physics : Journal of Physics Education Vol. 7 No. 1 Tahun 2025
Publisher : UNIVERSITAS INDRAPRASTA PGRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/npjpe.v7i1.4111

The presence of geothermal manifestation such as Terak hot spring near granite massive bodies on Bangka Island raises an importatnt question about the subsurface characteristics of a potential radiogenic system. As traditional geothermal system in Indonesia is well known, research must now focus on understanding the radiogenic system, especially on the subsurface information. This study addresses the local magnetic susceptibility of Terak subsurface hot spring by performing magnetic method. The integration of 2D to 3D magnetic data, field observations and geological information show high susceptibility data (>0.005 SI) which are indicated as granite intrusion which act as the heat source. A central zone of lower susceptibility (<0.005 SI) displays a distinct pattern, interpreted as a fracture zone as the hydrothermal fluid pathways. The identification of recharge area further supports the interpretation of an active hydrothermal system. The result of this study are in good agreement with the geological framework of the region and contribute to a better understanding of radiogenic geothermal systems in Indonesia.

2D Interpretation of Subsurface Hot Spring Geothermal Structure in Nyelanding Village Through Schlumberger Geoelectricity Configuration Method Siregar, Rahmat Nawi; Kurniawan, Widodo Budi
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 7 No 1 (2018): 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.v7i1.2324

This research was done on the subsurface structure of Nyelanding village hot spring, Air Gegas district, South Bangka with coordinates 2 44’54.514” South Latitude and 106 16’6.773” East Longitude using the Schlumberger geoelectricity configuration method. Measurements were made on three different tracks. The results of the Schlumberger configuration geoelectricity measurements for the three trajectories indicate the presence of granite rock distribution with resistivity values ranging from 455 – 1046 m.

Intensity level as sustainable energy: Analysis of the conversion of energy stored on cicadas sound waves Umam, Rofiqul; Palupi, Endah Kinarya; Yakin, Khusnul; Iqbal, Mochamad; Siregar, Rahmat Nawi; Irzaman, Irzaman
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 10 No 2 (2021): 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.v10i2.9798

In this study, the researchers measured cicadas' sound waves, considering that cicadas are mostly found in rural areas. The intensity level meter (AMTAST AMF003) was used with time variations (9:00 JST; 12:00 JST; and 15:00 JST). Measurements of air temperature differences (Krisbow Temperature & Humidity Data Logger) were also carried out, and weather conditions were also considered in data collection using satellite data from Himawari, Japan. The interpretation results of intensity level's trend measured at 3:00 pm JST were decreased concerning the changes in days. Meanwhile, the measurement at 09:00 am and 12:00 pm JST did not show a decrement concerning the changes in days (31 days in total). These results show that temperature changes (towards autumn) can affect the intensity level of sound waves. In addition, slightly different intensity levels can affect large changes in acoustic power or the produced sound.

Co-Authors Ahmat Munawir Siregar Alamta Singarimbun Dwi Anggraeni Endah Kinarya Palupi Ikah N. P. Permanasari Iqbal, Mochamad Iqbal, Mochamad Irzaman, Irzaman Khusnul Yakin Maria Evalina Purba Maya Efiarni Eka Putri Mochamad Iqbal Muhamad Ragil Setiawan Muhamad Ragil Setiawan Palupi, Endah Kinarya puspitarum, deska lismawenning Rofiqul Umam Rohim, Miftahul Sismanto Sismanto Vico Luthfi Ipmawan Widodo Budi Kurniawan Yakin, Khusnul

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