Seismic Vulnerability Index Analysis Using the HVSR (Horizontal to Vertical Spectral Ratio) Method in Nagari Malampah, Tigo Nagari District, Pasaman Regency

Satifa Rahmania; Akmam Akmam; Hamdi Hamdi; Zulhendra Zulhendra

doi:10.24036/pvc23h20

Authors

Satifa Rahmania Department of Physics, Padang State University, Padang Author
Akmam Department of Physics, Padang State University, Padang Author
Hamdi Department of Physics, Padang State University, Padang Author
Zulhendra Department of Physics, Padang State University, Padang Author

DOI:

https://doi.org/10.24036/pvc23h20

Keywords:

Seismic Vulnerability Index, Microtremor, HVSR

Abstract

Pasaman Regency, particularly Nagari Malampah in Tigo Nagari District, is one of the areas prone to seismic activity. This region lies along the active Sumatra Fault Zone and has complex topographical conditions, including mountainous areas, lowlands, and river flows. The earthquake with a magnitude of 6.2 SR that occurred on February 25, 2022, in West Pasaman had a significant impact on Nagari Malampah, causing infrastructure
damage and landslides. The lack of public awareness regarding disaster mitigation has further worsened the resulting impacts. This study aims to determine the seismic vulnerability index in Nagari Malampah. The research was conducted in Jorong Siparayo, Nagari Malampah, using a quantitative approach through data collection with microtremor measurements at 16 points. The microtremor signal data were analyzed using the HVSR method with the EasyHVSR software to obtain the dominant frequency, amplification factor, and seismic vulnerability index.
Data interpretation was supported by the values of dominant frequency, amplification factor, and seismic vulnerability index obtained at each measurement point. The study carried out in Nagari Malampah, using the
HVSR method, resulted in dominant frequency values ranging from 1.45 to 11.45 Hz, amplification factor values ranging from 2.34 to 6.21, and seismic vulnerability index values ranging from 0.60 to 9.33. Furthermore, based
on the distribution map of the seismic vulnerability index in Nagari Malampah, Tigo Nagari District, Pasaman Regency, the area has a range of low to high seismic vulnerability levels.

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