<![CDATA[Muara Bangkahulu District, Bengkulu City, is a coastal area located in an active seismic zone influenced by the Sumatra Subduction Zone and the Sumatra Fault. The geological conditions, dominated by alluvial sediments and swamp deposits, have the potential to amplify earthquake waves, requiring a study of subsurface characteristics as a basis for disaster mitigation. This study aims to identify variations in shear wave velocity (Vs30) and to determine soil site classification in accordance with SNI 1726:2019. The method used is Multichannel Analysis of Surface Waves (MASW), with ten measurement points and a track length of 50 m. The data were processed using Rayleigh-wave dispersion analysis and inversion to obtain a one-dimensional (1D) model, which was then integrated with two-dimensional (2D) modeling to describe lateral subsurface variations. The results show that the Vs30 value ranges from 137 to 450 m/s, with sites classified into SE, SD, and SC classes. The coastal area is dominated by soft-to-medium soils with high seismic amplification potential, while the central and eastern parts exhibit denser, more stable soil conditions. The integration of 1D and 2D models shows a heterogeneous subsurface structure both vertically and laterally. In conclusion, the MASW method is effective for technical considerations in seismic hazard assessment, for determining construction priorities, and for planning foundations better adapted to local soil conditions in the coastal area of Bengkulu City]]>
Copyrights © 2026
