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All Journal Journal of Geoscience, Engineering, Environment, and Technology Jurnal Pendidikan Fisika dan Teknologi
Apriana, Yelda
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Earth & Planetary Sciences Education Engineering Environmental Science Physics

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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.
Analysis of Potential New Flood Basin in Ratu Agung Sub-district Using the HVSR Method Apriana, Yelda; Refrizon; Farid, Muchammad; Onawa, Jonah; Hardianza, Meno; Setyowati, Yuni; Verentina, Sendiya
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 3 (2025): JGEET Vol 10 No 03 : September (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.3.22541

Abstract

Indonesia is a tropical country with high rainfall and diverse topography, making it prone to flooding. In Bengkulu City, the flood risk is particularly high in low-lying and flood basins, which are critical zones for flood risk mitigation. This study aims to analyze the characteristics of rock types and water infiltration potential that may  trigger new flood basins in Ratu Agung District, Bengkulu City. The microtremor method was applied to assess soil  properties based on the dominant frequency (f0), amplification factor (A0), and sediment layer thickness. The analysis showed (f0) values ranging from 1.13 to 8.55 Hz and (A0) values ranging from 0.74 to 4.59. HV-Inv analysis results indicate shear wave velocity Vs values between 53 and 894 m/s, with five sediment layers reaching a depth of 100 m. Higher Vs values generally represent denser, less porous rock, limiting infiltration and increasing surface runoff, which elevates flood potential. The findings of this study are expected to serve as a reference for flood risk mitigation, especially in minimizing infrastructure damage and social impacts in Bengkulu City.
Co-Authors Abimayu, Dadin Mars Al Ansory, Andre Rahmat Farid, Muchammad Halauddin Halauddin Hardianza, Meno Jaya, Shara Ashari Prana Jaya Onawa, Jonah Refrizon Refrizon Refrizon Sholeha, Della Zakia Verentina, Sendiya Yuni Setyowati