Mapping of soil vulnerability to earthquake using the HVSR method in microtremor measurements in Marga Agung Area, South Lampung Regency

Natalia, Fransiska
Khoiriyyah, Alfi
Syafitri, Meta Nisrina
Antosia, Risky Martin

Indonesian Journal of Innovation and Applied Sciences (IJIAS)
Vol. 6 No. 1 (2026): February-May

This study was conducted in Marga Agung Village, Jati Agung Subdistrict, South Lampung Regency, using the Horizontal to Vertical Spectral Ratio (HVSR) method based on microtremor data. This study aims to analyze the characteristics of the subsurface layers and determine the soil vulnerability level in Marga Agung Village, through soil vulnerability zoning mapping based on the natural frequency (f0), amplification factor (A0), seismic vulnerability index (Kg), and shear wave velocity to a depth 30 meters (Vs30), and examined the potential level of building damage as a basis for earthquake disaster mitigation efforts. The results show that f0 values range from 0.31 Hz to 27.96 Hz,  A0 values range from 1.59 to 5.10, and Kg values range from 0.15 to 53.45, dominated by low seismic vulnerability index values. Vs30 values are dominated by stiff soil (Type D) and very dense and soft rock (Type C), with a range from 191.05 to 440.85 m/s. This indicates that most of Marga Agung Village has relatively low soil vulnerability to earthquake ground shaking.