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

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

doi:10.47540/ijias.v6i1.2706

Authors

Fransiska Natalia Geophysical Engineering, Sumatera Institute of Technology, South Lampung, Indonesia
Alfi Khoiriyyah Geophysical Engineering, Sumatera Institute of Technology, South Lampung, Indonesia
Meta Nisrina Syafitri Geophysical Engineering, Sumatera Institute of Technology, South Lampung, Indonesia
Risky Martin Antosia Geophysical Engineering, Sumatera Institute of Technology, South Lampung, Indonesia

DOI:

https://doi.org/10.47540/ijias.v6i1.2706

Keywords:

HVSR Method, Microtremor, Soil Vulnerability, Seismic Vulnerability Index, Vs30

Abstract

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 (K_g), 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 K_g 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.

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