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Regional correlations for estimating seismic amplification. Implications for loss assessment in SW Iberia
Abstract Most earthquake-related losses are enhanced by soil amplification phenomena, especially in areas where high vulnerability assets coexist. These mechanisms are frequently inferred from empirical formulas. These procedures are based on the average shear-wave velocity to 30 m depth (V s30) as a proxy for amplification events. However, past analysis of spatial relationships between the V s30 and nonlinear soil behaviour has frequently resulted in poor correlations, affecting all onward analysis. In this research, these relationships are further analysed using an Earthquake Loss Estimation Software. In this framework, the Algarve region and associated ground motion have been depicted based on a certified seismic catalogue. This region has a moderate seismic hazard but possesses a complex geology and dissimilar seismogenic sources. The source data for this research has been V s30 data collected from geologic surveys made for the region in 2010 in the framework of the Study of Seismic Risk and Tsunamis in Algarve (ERSTA) coordinated by the Portuguese Civil Protection. Other data collected has been the V s30 topography compiled by the USGS and geologic information available by the OneGeology collaborative project. The goal of this research is to identify inaccuracies that potentially occur in estimating the site effects by different approaches. In this framework three amplification factors based on different sources - V s30 field-data, V s30 using slope as proxy and V s30 using geology as proxy – have been tested. The results have shown a good correlation between V s30-field-data and geologic based V s30 and a minor correlation between the former and slope based V s30. However, regarding the seismic losses - building damage and human losses - the final results show similar values for all three amplification factors analysed.
Highlights Earthquake related losses have been determined considering the soil amplification phenomenon. Site response studies have been carried out. Three empirically-based amplification factors tested: A k1 (V s30-field-data), A k2 (V s30-slope) and A k3 (V s30-geology). Regarding the seismic losses, good correlations have been observed for all the amplification factors.
Regional correlations for estimating seismic amplification. Implications for loss assessment in SW Iberia
Abstract Most earthquake-related losses are enhanced by soil amplification phenomena, especially in areas where high vulnerability assets coexist. These mechanisms are frequently inferred from empirical formulas. These procedures are based on the average shear-wave velocity to 30 m depth (V s30) as a proxy for amplification events. However, past analysis of spatial relationships between the V s30 and nonlinear soil behaviour has frequently resulted in poor correlations, affecting all onward analysis. In this research, these relationships are further analysed using an Earthquake Loss Estimation Software. In this framework, the Algarve region and associated ground motion have been depicted based on a certified seismic catalogue. This region has a moderate seismic hazard but possesses a complex geology and dissimilar seismogenic sources. The source data for this research has been V s30 data collected from geologic surveys made for the region in 2010 in the framework of the Study of Seismic Risk and Tsunamis in Algarve (ERSTA) coordinated by the Portuguese Civil Protection. Other data collected has been the V s30 topography compiled by the USGS and geologic information available by the OneGeology collaborative project. The goal of this research is to identify inaccuracies that potentially occur in estimating the site effects by different approaches. In this framework three amplification factors based on different sources - V s30 field-data, V s30 using slope as proxy and V s30 using geology as proxy – have been tested. The results have shown a good correlation between V s30-field-data and geologic based V s30 and a minor correlation between the former and slope based V s30. However, regarding the seismic losses - building damage and human losses - the final results show similar values for all three amplification factors analysed.
Highlights Earthquake related losses have been determined considering the soil amplification phenomenon. Site response studies have been carried out. Three empirically-based amplification factors tested: A k1 (V s30-field-data), A k2 (V s30-slope) and A k3 (V s30-geology). Regarding the seismic losses, good correlations have been observed for all the amplification factors.
Regional correlations for estimating seismic amplification. Implications for loss assessment in SW Iberia
Fazendeiro Sá, Luis (author) / Morales-Esteban, Antonio (author) / Durand Neyra, Percy (author)
2019-11-27
Article (Journal)
Electronic Resource
English
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