MICROZONATION OF EARTHQUAKE HAZARD AREA USING THE HVSR METHOD IN THE SOUTHERN REGION OF KARANGASEM REGENCY

Nova Susanti; Rabiah Al Adawiyah; Febri Berthalita Pujaningsih; Alrizal Alrizal; Athanasius Cipta

doi:10.22437/jiituj.v10i1.50891

Authors

Nova Susanti Universitas Jambi https://orcid.org/0000-0003-2690-4625
Rabiah Al Adawiyah Universitas Jambi
Febri Berthalita Pujaningsih Universitas Jambi https://orcid.org/0000-0003-1979-4587
Alrizal Alrizal Universitas Jambi https://orcid.org/0000-0002-1386-003X
Athanasius Cipta Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) https://orcid.org/0000-0001-6961-9790

DOI:

https://doi.org/10.22437/jiituj.v10i1.50891

Keywords:

Earthquake Microzonation, HVSR Method, Karangasem Regency, Microtremor Analysis, Seismic Vulnerability Index, Peak Ground Acceleration

Abstract

Southern Karangasem Regency, Bali, is located in a tectonically active zone and requires detailed local scale earthquake hazard assessment. This study aims to develop an earthquake hazard microzonation map for Bungaya, Padang Kerta, Tiyingtali, and Ababi villages by integrating microtremor analysis and seismic source modeling. Single-station microtremor measurements were analyzed using the Horizontal-to-Vertical Spectral Ratio (HVSR) method to obtain dominant frequency (f₀), amplification factor (A₀), and seismic vulnerability index (K_g). Peak Ground Acceleration (PGA) was estimated based on modeled earthquake sources affecting the study area. The results show that f₀ values range from 0.51–8.78 Hz, A₀ values from 0.8–7.46, and K_g values from 0.78–14.86, indicating varying local site conditions. The estimated PGA ranges from 157 to 171 gals, corresponding to VI–VII on the MMI scale. The spatial distribution of these parameters reveals significant variation in earthquake hazard levels across the southern Karangasem region. The novelty of this study lies in the integration of HVSR-derived site response parameters with PGA modeling to produce a detailed village-scale microzonation map. The results provide valuable implications for seismic risk mitigation, spatial planning, and earthquake-resilient infrastructure development in seismically active regions.

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Author Biographies

Nova Susanti, Universitas Jambi

Physics Education Department, Universitas Jambi, Jambi, Indonesia

Rabiah Al Adawiyah, Universitas Jambi

Physics Education Department, Universitas Jambi, Jambi, Indonesia

Febri Berthalita Pujaningsih, Universitas Jambi

Physics Education Department, Universitas Jambi, Jambi, Indonesia

Alrizal Alrizal, Universitas Jambi

Physics Education Department, Universitas Jambi, Jambi, Indonesia

Athanasius Cipta, Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG)

Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG), Jawa Barat, Indonesia

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