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Journal of Experimental and Applied Physics
Published by Universitas Negeri Padang
ISSN : 29880378     EISSN : 29879256     DOI : -
Core Subject : Science, Engineering,
Control & Systems Engineering Electrical & Electronics Engineering Materials Science & Nanotechnology Physics
Journal of Experimental and Applied Physics: an international peer-reviewed open-access journal dedicated to interchange for the results of high-quality research in all aspects of theoretical physics, applied physics, electronics and instrumentation, material physics, biophyiscs, geophysics, high energy physics and computational physics.
Arjuna Subject : Fisika dan Astronomi - Instrumentasi
Articles 5 Documents
 1 
Search results for , issue "Vol 3 No 3 (2025): September Edition" : 5 Documents clear
Seismicity Level Analysis of the West Coast of Northern Sumatra in 1964-2023 based on Spatial and Temporal Variations of Seismotectonic Parameters Arieza, Moreno Wahyu
Journal of Experimental and Applied Physics Vol 3 No 3 (2025): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i3.102

Abstract

Located in the subduction zone of the Indo-Australian Plate beneath the Eurasian Plate, the west coast of northern Sumatra exhibits high seismic activity, as evidenced by the 2004 Aceh earthquake (Mw9.1) and the 2005 Nias–Simeulue earthquake (Mw8.6). This study aims to analyze the spatial and temporal variations of b-values and a-values to assess rock stress accumulation and seismicity levels, as a preliminary step toward earthquake hazard mitigation. The analysis was conducted using the Maximum Likelihood method based on the Gutenberg–Richter law. Earthquake data were obtained from the USGS catalog from 1964 to 2023, with events of Mw ≥ 5.0 and focal depths shallower than 60 km, within the coordinates 2.01°S–7.54°N and 92.77°E–99.45°E. The results indicate that b-values vary from 0.53–0.57 in Nagan Raya and Aceh Singkil to as high as 2.07 in the Indian Ocean northwest of Aceh. Similarly, a-values range from 4.3 to 12.45, with the lowest values also located in Nagan Raya and Aceh Singkil. The combination of low b- and a-values in these areas suggests high stress accumulation, indicating a greater potential for future significant earthquakes. The estimated earthquake return periods for Mw ≥ 7.0, Mw ≥ 8.0, and Mw ≥ 9.0 in Nagan Raya are 17.6, 60.8, and 210.3 years, respectively, while in Aceh Singkil they are 15.7, 57.3, and 208.8 years, highlighting the urgent need for seismic hazard preparedness in these regions.
Geophysics Quantitative Research Mapping of Geomagnetic Method Implementation for Geothermal Exploration: A Bibliometric Analysis Magribi, Fatin; Asrizal, Asrizal; Amir, Harman; Fitri, Leni
Journal of Experimental and Applied Physics Vol 3 No 3 (2025): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i3.106

Abstract

Indonesia is the second country with the largest geothermal potential in the world because Indonesia has many volcanoes and active tectonic activity causes the formation of geothermal energy around the mountain. The population growth rate in Indonesia is soaring, this condition is inversely proportional to the availability of non-renewable energy in Indonesia. The solution is to look for alternative energy substitutes, namely renewable energy, for example geothermal. This study aims to see the development and trends in the use of geomagnetic methods for geothermal exploration. The method used is bibliometric with a quantitative approach. Data retrieval and processing used the publish or perish application integrated with Google Scholar. The data used were 200 articles published on Google Scholar during 2015-2025 and 80 keywords found. Data analysis techniques by looking at the development of article trends each year, data network visualization, data overlay visualization and data density visualization. The results obtained from publications with the topic of geomagnetic method utilization trends for geothermal exploration in 2015-2025 increased every year. For the results of data network visualization, not only Indonesia but various international countries have also begun to utilize geothermal. The results of the visualization of Indonesia's geothermal data overlay were much sought after in 2019.
Effect of the composition of activated carbon from coconut shell and paraffin on the performance of a carbon paste electrode for the detection of Pb(II) Habibi, Haadi Farros
Journal of Experimental and Applied Physics Vol 3 No 3 (2025): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i3.117

Abstract

This study examines the effects of the ratio on the composition of carbon paste electrodes with carbon derived from coconut shells and the feasibility of these electrodes as working electrodes in the cyclic voltammetry method for the measurement of lead Pb(II) values. In this study, measurements were conducted on a Pb(II) lead solution with a working electrode comprising a carbon paste electrode derived from coconut shell charcoal. The sensitivity,repeatability, and linearity of the electrode were evaluated in the measurement of lead Pb(II) by the cyclic voltammetry method. This study was conducted with the objective of identifying the optimal electrode composition for the measurement of lead Pb(II) by cyclic voltammetry. Three variations of electrode composition were prepared, 6:4, 7:3, and 8:2, to ascertain the impact of electrode composition on the sensitivity of the measurement. The feasibility of carbon paste electrodes as a working electrode in the cyclic voltammetry method was evaluated by conducting experiments with variations in the concentration of lead pb(II) solutions, 1 ppm, 2 ppm, 4 ppm, and 8 ppm. The test results demonstrate that the composition of the carbon paste electrode influences the measurement outcomes. The optimal composition is 8:2, which produces the highest peak values of (Ipa) and (Ipc) currents compared to other electrode compositions. Additionally, carbon paste electrodes comprising coconut shell charcoal materials exhibit good repeatability and linearity values, meeting the established standards. As a result, the electrode can be deemed suitable for use as a working electrode in the electrochemical analysis method.
Analysis of the Subsurface Structure Using the HVSR Method in Jorong Air Putih Lima Puluh Kota Regency Afifah, Nurul
Journal of Experimental and Applied Physics Vol 3 No 3 (2025): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i3.129

Abstract

This study aims to analyze the subsurface structure and soil stability in the Jorong Air Putih area, Lima Puluh Kota Regency, West Sumatra Province, using the Horizontal to Vertical Spectral Ratio (HVSR) method. This area is known as a landslide-prone zone influenced by steep topography, complex geological conditions, and relatively high seismic activity. Therefore, understanding subsurface characteristics is crucial for geological disaster mitigation efforts and sustainable infrastructure planning. Data collection was conducted through microtremor surveys at 18 measurement points distributed across the study area. The data were analyzed using Easy HVSR software to calculate important seismic parameters, including the dominant frequency value , amplification factor , , seismic vulnerability index (Kg), and estimated shear wave velocity (Vs). The analysis results show that the dominant frequency values range from 0.4 Hz to 10.6 Hz, reflecting variations in the thickness and properties of subsurface layers, ranging from soft sediments to hard rocks. The measured amplification factor ranges from 1.22 to 3.20, indicating the potential for seismic wave amplification in certain soil layers. The seismic vulnerability index is mostly low, but there is one observation point showing moderate vulnerability, The shear wave velocity value.
Identification of Landslide-Prone Areas in Bukik Lantak Timpeh Subdistrict Dharmasraya Regency Using the HVSR Method Andesta, Cindy
Journal of Experimental and Applied Physics Vol 3 No 3 (2025): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i3.130

Abstract

Landslides are one of the natural disasters caused by the movement of soil or rock masses downhill. Landslides are caused by disturbances in the stability of the soil or rock that make up the slope. One of the areas frequently affected by landslide is Timpeh Subdistrict. Therefore, microtremor data collection was conducted at Bukik Lantak, Timpeh Subdistrict, Dharmasraya Regency to determine the predominant frequencies and amplification factors in the region, utilizing the Horizontal to Spectral Ratio (HVSR) method. Furthermore, the dominant frequency and amplification values were processed to determine the seismic vulnerability index and shear wave velocity were used to identify areas prone to landslides. Based on the analysis of microtremor data, the dominant frequency values ranged from 0.1 to 9.55 Hz, amplification factor values ranging from 1.11 to 4.12, seismic vulnerability index values between 0.3052 and 15.376, and shear wave velocity values ranging from 120 m/s to 1800 m/s. Areas with high landslide potential are those with a combination of low dominant frequency values, low shear wave velocity, high amplification factor values, and high seismic vulnerability indices. Areas meeting these criteria are located at research points TP1, TP3, TP5, TP7, TP15, and TP16.

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