Microzonation Of Seismic Vulnerability Index Based on Horizontalto Vertical Spectral Ratio Method In Kapanewon Prambanan,Sleman Regency

Riski Dwiantoro; Bambang  Sunardi; Zaroh  Irayani

doi:10.35895/rf.v6i2.68

Authors

Riski Dwiantoro Jurusan Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Jenderal Soedirman Author
Bambang Sunardi Badan Meteorologi, Klimatologi dan Geofisika (BMKG) Author
Zaroh Irayani Universitas Jenderal Soedirman Author

DOI:

https://doi.org/10.35895/rf.v6i2.68

Keywords:

Amplification Factor, Dominant Frequency, HVSR, Seismic Vulnearibility, Vs30

Abstract

Prambanan Sub-district, Sleman Regency, is located in the Yogyakarta Basin, which has complex geological characteristics. This area consists of thick sedimentary deposits, making it vulnerable to increased seismic wave amplitude. This geological complexity plays a major role in increasing seismic risk, which occurred during the 2006 Yogyakarta Earthquake, where this area was on the VII MMI intensity scale and experienced quite severe infrastructure damage. Therefore, a study of seismic vulnerability microzonation is needed as a step to mitigate earthquake disaster risk. This study uses the Horizontal to Vertical Spectral Ratio (HVSR) method by comparing the spectrum of horizontal and vertical components of microtremor waves to produce dominant frequency values, amplification factors, and seismic vulnerability indexes. Furthermore, the HVSR curve is inverted using the Particle Swarm Optimization (PSO) method to obtain the average shear wave velocity value up to a depth of 30 meters VS30. The results of the analysis show that the dominant frequency values in the study area range from 0.98 Hz to 17.13 Hz, while the amplification factor is in the range of 1.06 to 11.69. The VS30 value varies from 114 m/s to 726 m/s, and the seismic vulnerability index ranges from 0.18 to 7.46. Geologically, the Madurejo, Sumberharjo, and Bokoharjo Village areas located in the Young Merapi Formation have high seismic vulnerability values. This is due to the dominance of soft soil material and thick sediment layers. In contrast, areas with the Semilir and Kebobutak Formations dominated by hard rocks and hilly topography show lower vulnerability values. Based on these results, areas with high vulnerability levels need to be prioritized in earthquake-resistant infrastructure development planning and sustainable disaster mitigation strategies.

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