Microtremors HVSR Correlation with Sub Surface Geology and Ground Shear Strain at Palu City, Central Sulawesi Province, Indonesia

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Year:
2014
Type of Publication:
Article
Keywords:
Microtremor, Sedimentary Layers, Seismic Vulnerability Index, Ground Shear Strain, Palu City
Authors:
PyiSoe Thein; Subagyo Pramumijoyo; Kirbani Sri Brotopuspito; Junji Kiyono; Wahyu Wilopo; Agung Setianto
Journal:
IJISM
Volume:
2
Number:
5
Pages:
420-426
Month:
September
Abstract:
In the present study, we have performed microtremor measurements at Palu City, Indonesia for HVSR correlation, which will be used in seismic hazard mapping. We found the correlation between subsurface geology and microtremors HVSR, even in complex geological settings. Considering the damage produced by the 2005 Palu earthquake (Mw 6.3), we also estimated seismic vulnerability index and ground shear strain distribution at Palu City. We believe that the surface geological conditions also reflected in the variations of the resonance frequencies of the soils. Microtremor survey results showed that in hilly areas had low seismic vulnerability index, whereas in coastal alluvium was composed of material having a high seismic vulnerability indication. Understanding the parameters of sedimentary layers, seismic vulnerability index and ground shear strain are very important for seismic hazard mitigation and environmental planning in Palu City.

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