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<p>This study analyses the seismic vulnerability based on bedrock depth and soil stratigraphic profile characteristics for a case study of Muara Bangkahulu, Bengkulu Province, Indonesia. This study is initiated by measuring the ambient noise, which is then utilised employing the horizontal-to-vertical spectral ratio method, followed by inversion using Monte Carlo sampling simulated annealing. The analysis produced a one-dimensional (1D) shear wave velocity profile, visualising the distribution of seismotectonic parameters, soil amplification, bedrock, dominant frequency, seismic vulnerability, <i>V</i><sub><i>s30</i></sub> distribution, natural period and site classification through interpolation. Furthermore, stratigraphy and three-dimensional (3D) geological models were identified via statistical analysis. The results indicate a high level of seismic vulnerability within the study area, marked by significant amplification and low dominant frequency. Site classification is predominantly site class C (medium soil) and site class D (soft soil), with higher vulnerability in areas exhibiting low <i>V</i><sub><i>s30</i></sub> values, especially within site class C. Variations in bedrock depth reveal an east–west elongated basin structure, with greater depths near the coastline. These findings are strategic for defining hazard zones and seismic microzonation. The study provides a scientific basis for local government spatial planning and geology-based disaster mitigation. Therefore, it contributes to strengthening regional resilience and sustainable disaster risk reduction.</p>

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A Case Study on Geophysical Characterisation of Bedrock Depth and Soil Stratigraphy

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Verza Julyani,
  • Lindung Zalbuin Mase,
  • Hardiansyah Hardiansyah,
  • Rena Misliniyati,
  • Khairul Amri,
  • Suched Likitlersuang

摘要

This study analyses the seismic vulnerability based on bedrock depth and soil stratigraphic profile characteristics for a case study of Muara Bangkahulu, Bengkulu Province, Indonesia. This study is initiated by measuring the ambient noise, which is then utilised employing the horizontal-to-vertical spectral ratio method, followed by inversion using Monte Carlo sampling simulated annealing. The analysis produced a one-dimensional (1D) shear wave velocity profile, visualising the distribution of seismotectonic parameters, soil amplification, bedrock, dominant frequency, seismic vulnerability, Vs30 distribution, natural period and site classification through interpolation. Furthermore, stratigraphy and three-dimensional (3D) geological models were identified via statistical analysis. The results indicate a high level of seismic vulnerability within the study area, marked by significant amplification and low dominant frequency. Site classification is predominantly site class C (medium soil) and site class D (soft soil), with higher vulnerability in areas exhibiting low Vs30 values, especially within site class C. Variations in bedrock depth reveal an east–west elongated basin structure, with greater depths near the coastline. These findings are strategic for defining hazard zones and seismic microzonation. The study provides a scientific basis for local government spatial planning and geology-based disaster mitigation. Therefore, it contributes to strengthening regional resilience and sustainable disaster risk reduction.