Seismic Microzonation and Site Characterization Along an Active Fault Segment Using Microtremor and Geotechnical Data
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The Sianok Segment, one of 19 sections of the Great Sumatran Fault (GSF), extends for 90 km with a minimum slip rate of 14.5 ± 0.5 mm/yr (Bradley et al., 2017). It cuts through densely populated regions of West Sumatra, including Agam Regency, Bukittinggi, Padang Panjang, and Solok, which are highly prone to earthquakes. This study investigates site characteristics and develops a seismic microzonation to assess potential hazards along the Sianok Segment. Data were collected from 45 randomly distributed microtremor recording sites and 10 subsurface investigations (Standard Penetration Test and Cone Penetration Test). Results indicate that predominant periods range from 0.14–1 s in mountainous terrain and exceed 1 s in urban areas such as Padang Panjang, Solok, Pasaman, and Bukittinggi. Regarding liquefaction, the seismic vulnerability index and ground shear strain suggest that most of the region is susceptible to surface cracking (γ > 10⁻³) and moderate liquefaction. More severe liquefaction is expected in the flat southeastern zone toward Solok during a major earthquake (0.6 g). The seismic vulnerability index varies with soil resonance frequency and amplification from bedrock to surface, with Bukittinggi and Padang Panjang identified as highly vulnerable. These findings provide essential input for shaking maps, hazard map updates, and disaster mitigation planning along the Sianok Segment.
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