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All Journal Inersia : Jurnal Teknik Sipil dan Arsitektur IJOG : Indonesian Journal on Geoscience GRADIEN Jurnal Fisika Unand Jurnal Fisika FLUX Jurnal Geocelebes Wikrama Parahita : Jurnal Pengabdian Masyarakat Jurnal Penelitian Pendidikan IPA (JPPIPA) Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Spektra: Jurnal Fisika dan Aplikasinya Jurnal Meteorologi Klimatologi dan Geofisika Jurnal Ilmu Fisika Jurnal Pendidikan Fisika dan Teknologi Abdimas Umtas : Jurnal Pengabdian kepada Masyarakat Indonesian Physical Review Journal Innovation of Civil Engineering (JICE) Journal of Technomaterial Physics Aceh International Journal of Science and Technology Jurnal Geosaintek
Refrizon Refrizon
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Journal : Jurnal Pendidikan Fisika dan Teknologi

 1 
Geothermal Lithology Identification in Air Putih, Lebong, Bengkulu Using Magnetotelluric (MT) Method Sholeha, Della Zakia; Farid, Muchammad; Refrizon, Refrizon
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 11 No 1 (2025): January-June
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v11i1.8417

Abstract

Lebong is one of the areas located in Bengkulu Province and is passed by the Ketaun Segment fault. The fault causes several locations in Lebong to have manifestations such as hot springs, solfatara, and fumarole. This research aims to identify rock lithology with 2D modeling using the magnetotelluric method.  The data acquisition process was carried out using a magnetotelluric device with a low frequency of 128 Hz, a medium frequency of 1024 Hz, and a high frequency of 4096 Hz. The sensor in the recording consists of two sensors, namely electric and magnetic. Based on the field survey, the results obtained are several distributions of resistivity values from low, medium, and high. The acquired data was processed using ZONDMT software to obtain 2D modeling. The results of data processing interpret the resistivity value to depth. There are 8 measuring points in one track with a west-southeast direction. Variations in measured resistivity consist of low, medium, and high resistivity.  The distribution of low resistivity values (10-25 Ωm) in this area is identified as the response of the caprock, having a depth of <1.5 km, shown in light blue. The distribution of medium resistivity values (40-150 Ωm) shown in green to yellow is identified as a reservoir zone with a depth of >1.8 km. Rocks with high resistivity values (>300 Ωm) shown in red are identified as hot rock zones. Hot rocks are at a depth of 4-6 km. The range of frequency values on the 2D modeling color scale ranges from 1-800 Ωm. The results of this study can be used as a basis for feasibility studies for local governments to develop geothermal energy projects. By knowing the subsurface characteristics, the potential for geothermal energy reserves in Lebong can be evaluated more accurately.
Blasting Vibration Analysis with Micromate Tools: Experimental Study and Characterization at the PT Semen Padang Mine Sya’adah, Isni; Hadi, Arif Ismul; Refrizon, Refrizon; Falenia, Felly
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 10 No 1 (2024): January-June
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v10i1.6810

Abstract

This research investigates the impact of vibrations produced by blasting activities at the PT Semen Padang Mine, with a focus on vibration analysis and experimental characterization using the Micromate tool. The main objective of this research is to understand the vibrations resulting from blasting, analyze the impact of variations in PVS (Peak Vector Sum) values, and evaluate the effect on the surrounding environment, especially employee housing around the mining area. The research method used involves several important stages, first of which is the use of a Micromate tool to measure the vibrations produced during the blasting process. Micromate is a tool that can record and analyze vibrations with high accuracy, thus providing reliable data for further analysis. Apart from that, this research also uses power regression analysis to understand the relationship between PVS and Scaled Distance variables. This analysis is important to determine how variations in blasting distance and intensity affect the resulting PVS values. Then, a distance analysis was carried out to obtain a PVS value below 3 mm/s, which is considered a safe threshold to prevent structural damage to the building. The research results show several important findings. Even though the measured vibration values ​​are below the Threshold Values ​​set by environmental regulations, it is important to comply with all existing regulations to avoid long-term negative impacts. The power regression analysis carried out shows that there is a significant relationship between PVS and Scaled Distance, which means that the greater the distance between the blasting point and the measurement point, the smaller the PVS value detected. The validation results of this analysis are also in accordance with the empirical data collected during the research. In addition to these main findings, this research also provides several practical recommendations. One of them is setting the explosive charge to reduce the impact of the resulting ground vibrations. These arrangements include reducing the amount of explosive per blast or changing the blasting technique to reduce vibration intensity. In conclusion, this research provides an in-depth understanding of the factors that influence vibrations from blasting in a mining context. The results of this research have important implications for the development of more accurate and effective vibration measurement methods as well as for mitigating environmental impacts caused by blasting activities. This research not only provides new insights for the mining industry but also helps in formulating better policies to protect the environment and communities around mining areas. Thus, this research contributes to ongoing efforts to achieve a balance between industrial activities and environmental sustainability.
Seismic Vulnerability Index Mapping Based on PGA, GSS, and MMI Values in Pasar Ujung Kepahiang Village Sapanur, Destika Meisy; Hadi, Arif ismul; Refrizon, Refrizon
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 10 No 2 (2024): July - December
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v10i2.7440

Abstract

Pasar Ujung Village is located in Kepahiang District, which has the highest growth rate and population compared to other sub-districts in Kepahiang Regency, with a growth rate of 1.63% and a population of 53,066 thousand people. As one of the efforts to minimize the occurrence of damage due to earthquake disasters in Pasar Ujung Village, Kepahiang, it is necessary to map the seismic vulnerability index using the microtremor method. The research was conducted in Pasar Ujung Village, Kepahiang. Measurement points were placed at 28 points with a distance of approximately 200 m between points. Primary data used in this study came from microtremor surveys with A0 and f0 values. The results of the study are also included in the high-risk category for the social impact of earthquake disasters with an MMI value of more than 7. Based on the PGA map, it shows that the research location is quite prone to damage due to earthquakes, with a PGA value of > 564gal. Based on the PGA value obtained, the value is classified as instrumental intensity scale VI-VIII with shaking strength in the strong to very strong category. The magnitude of the earthquake, the depth of the source, and the distance of the earthquake source from the research location also contribute. The thickness of the surface sediment layer can be a consideration for people who will carry out development.
Stratigraphic Determination Based on Shear Wave Velocity for Earthquake Disaster Mitigation in Lebong District Jaya, Shara Ashari Prana Jaya; Refrizon, Refrizon; Halauddin, Halauddin; Al Ansory, Andre Rahmat; Abimayu, Dadin Mars; Sholeha, Della Zakia; Apriana, Yelda
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 10 No 2 (2024): July - December
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v10i2.7478

Abstract

Bengkulu Province, including North Bengkulu and Lebong, is located in the subduction zone of the Indo-Australian and Eurasian plates, which makes the region prone to earthquakes. This research focuses on earthquake disaster mitigation in the Lemeu area, Uram Jaya District, and Lebong Regency. It identifies areas prone to earthquake shaking based on Vs stratigraphy, Vs30 distribution, and soil site class. The Vs value was measured directly using the Multichannel Analysis of Surface Wave (MASW) method for three passes. Each track has four stations, so there are 12 data collection stations. The station point is the center point of a series of 24 geophones. Each geophone has a recording time of 512 ms and a sampling rate time of 125 ms to obtain 4096 data for each geophone. The measurement data was processed using WINMASW 5.0 professional software to produce a 1D profile. From the stratigraphic Vs, Vs30 is calculated and used to determine the site class, and then a distribution map is made. The results show that this area consists of site classes D, C and B. Medium soil with a value range of 175 ≤ Vs30 ≤ 350, hard soil with a value range of 350 ≤ Vs30 ≤ 750 and soft rock with a value range of 750 ≤ Vs30 ≤ 1500. Of the 12 measurement points, 2 locations have relatively shallow Vs30 values, namely at points 4 and 11. This location has Vs30 values ranging from 221 - 258 m/s, so around this point, there is likely a high potential for building damage in the event of an earthquake.
Identification of Groundwater Presence Using ERT (Electrical Resistivity Tomography) in Berkas Village, Teluk Segara Sub-district, Bengkulu City Fauzi, M. Wilzam; Suhendra, Suhendra; Refrizon, Refrizon; Halauddin, Halauddin; Rabbani, M Rifqi; Al Rafly, Tegar; Al Ansory, Andre Rahmat; Raihana, Hana; Rahmawati, Nurul 'Ilmi; Tri Utami, Olga
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 10 No 2 (2024): July - December
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v10i2.7717

Abstract

Kelurahan Berkas is a coastal area in Teluk Segara Sub-district, Bengkulu Regency, Bengkulu Province. The purpose of this research is to identify the presence of groundwater in Kelurahan Berkas. The method used was resistivity geoelectric method with Wenner-Schlumberger configuration. This research applied three lines, the first in the Southwest-Northeast direction and the second in the East-West direction, with a length of 240 metres each. The results show that the free aquifer layer in the first pass has a resistivity value of 1.61 Ω.m to 3.98 Ω.m at a depth of 7 metres to 24 metres. While the second pass has a resistivity value of 3.17 Ω.m to 9.23 Ω.m at a depth of 8 metres to 36.9 metres and the third pass has a resistivity value of 1.62 Ω.m to 7.05 Ω.m at a depth of 2 metres to 20 metres. The results also show that the lithology of the aquifer layer in the study area is interpreted as clay, sandy clay, and sand. This layer contains groundwater that has been affected by seawater intrusion. The influence of this intrusion causes the groundwater to have a relatively low percentage of salinity so that the groundwater at the research location feels brackish. The existence of seawater intrusion is caused by the kelurahan berkas right on the coast so that the kelurahan berkas community lacks clean water, so the well water becomes brackish, therefore with this research the community can find out the location or point where there is groundwater.
Co-Authors Abimayu, Dadin Mars Agung Satria, Lori Agustina, Tari Al Ansory, Andre Rahmat Al Rafly, Tegar Al-Ansory, Andre Rahmat Amalia, Isra Anggria, Della Cici Ansory, Andre Rahmat Al Apriana, Agnes Apriana, Yelda Apriyanti, Nurul Arif Ismul Hadi Arif Ismul Hadi Arsi, Sefti Dini Arya J Akbar Arya Putra Anggi Awaliyah, Isfardian Agustin Azzahra, Gusti Ayu Zahwa Bernard, Admo Daniel, Adrian Darmawan Ikhlas Fadli Fachri Faisal Fadli, Darmawan Ikhlas Falenia, Felly Farid*, Muchammad Farid, Muchammad Fauzi, M. Wilzam Febriansyah, Gian Ori Fikri, Muhammad Haikal Gayatriani, Intan Gumanty, Usman Halauddin Halauddin Halauddin Hanifah Maulani, Siti Hanipa, Rerisa Al Hardiansyah Hardiansyah Hardiansyah, Debi Harlianto, Budi Helinnes, Putri Henny Johan Herno Yudiansyah Hutasoit, Tegar Ashary Idris, Beni Syakban Ikhlas Fadli, Darmawan Irkhos Irkhos Isfardian Agustin Awaliyah Jaya, Shara Ashari Prana Jaya Kamal, Thomas Mustafa Kamila, Nur Husniatin Kausari, Alfata Khairul Amri Kusuma, Budi Praba Larang, Miranda Puspa Lindung Zalbuin Mase, Lindung Zalbuin M Farid Maesaroh, Rina Maesaroh Maghribi, Faritz Bagda Manurung, Yeni Sartika Misliniyati, Rena Muammar, Zaky Muhammad Dani Muhammad Farid Naldo, Asrol Nanang Sugianto Natasya, Indah Dwi Nazli, Khairun Novtrisa, Indri Nurhayati, Ratna Dewi Putri, Aisyah Cindy Phylia Putri, Elona Gita Gatra Putri, Melly Zuhadjar Putriani, Eli Rabbani, M Rifqi Rafly, Tegar Al Rahmat Al-Ansory, Andre Rahmat, Andre Rahmawati, Nurul 'Ilmi Rahmawati, Nurul Ilmi Raihana, Hana Rida Samdara Sahputra, Rio Sapanur, Destika Meisy Saputri, Winda Saragih, Ronni Samuel Sholeha, Della Zakia Suaidi Ahadi Suhendra Suhendra Sumajaya, Erlan Sumanjaya, Erlan - Supriani, Fepy Suwarsono Suwarsono Syah, M. Taufiqqurahman Syaputra, Edo Win Sya’adah, Isni Taufiqurrahman Syah, Muhammad Tri Utami, Olga Triutami, Olga Verentina, Sendiya Yuni Setyowati Zakariya, Hilmi