<p>Lebong Regency, Bengkulu Province, Indonesia, is situated directly along the Ketahun Segment of the Sumatra Fault, where near-fault ground motion effects and site amplification pose substantial seismic risk. High-density shear-wave velocity (V_s) datasets integrated with spatial amplification modelling remain scarce in fault-controlled sedimentary basins in Indonesia. This study establishes a high-resolution engineering seismic microzonation framework using 457 investigated points distributed across 12 subdistricts. Data processing was performed to obtain detailed subsurface V_s profiles and V_s30 values, followed by spatial interpolation using inverse distance weighting to generate continuous maps of soil site class and ground amplification factors. The findings indicate that extensive areas are dominated by Site Class D with low to moderate V_s30 values, reflecting soft sedimentary deposits with reduced shear stiffness. These conditions produce elevated amplification factors, highlighting significant near-surface modification of input ground motion and increased structural demand under strong earthquakes. By coupling dense field-based V_s profiling with quantitative spatial hazard assessment, this study advances regional-scale microzonation practice. It provides a robust geotechnical basis for seismic risk-informed spatial planning, foundation design, and infrastructure resilience in near-fault environments.</p>