Landslide Vulnerability Mapping using Dominant Frequency and HVSR Spectral Amplification Data at MAN Insan Cendekia Central Bengkulu

This study aims to map landslide vulnerability in the MAN Insan Cendekia Bengkulu Tengah area using the Horizontal to Vertical Spectral Ratio (HVSR) method. This method analyzes two main parameters, dominant frequency (f0) and spectral amplification (A0), which are then used to calculate the seismic vulnerability index (Kg). The results reveal varying levels of soil vulnerability in the studied area. Points with high A0 and low f0 values were found to be more prone to landslides, characterized by soft soils with high susceptibility to disruptions from earthquakes or heavy rainfall. Conversely, points with low A0 and stable f0 values indicate harder, more stable soils. Areas with high Kg values, such as Points l, m, n, and o, require special attention through mitigation interventions like soil structure reinforcement and drainage management. Areas with low Kg values are relatively stable but still necessitate periodic monitoring. This study produced distribution maps of A0, f0, and Kg, which provide essential information for disaster mitigation planning. This approach enables the design of targeted mitigation measures to reduce landslide risks, such as restricting construction in high-risk zones and reinforcing structures in vulnerable areas. Keywords: Vulnerability, Landslide, HVSR Spectral Amplification, Central Bengkulu