A national ground motion amplification model for Switzerland based on site proxies and incorporating local response observations at instrumented sites
Abstract
Mapping the site response of strong ground motion is one of the key steps for earthquake risk assessment studies. In the wider framework of the national ‘Earthquake Risk Model for Switzerland’ project, we have prepared a ground motion site amplification model covering entire Switzerland. The model includes amplification maps for peak ground velocity (PGV), pseudo-spectral acceleration (PSA) at T = 1.0, 0.6, 0.3 s and corresponding uncertainties. The amplification maps for PGV, PSA(1.0s) and PSA(0.3s) have been also translated into macroseismic intensity aggravation layers for their use in ShakeMaps representations. The site response model we have developed is based on the local earthquake amplifications measured by 280 seismic stations deployed across Switzerland and retrieved by means of the empirical spectral modelling technique. The local estimates of site response are then spread over the national territory resorting to a geological classification, multi-scale topographical slope and the inferred depth-to-bedrock as predictor layers for the extrapolation. The local measures of site amplification are embodied in the national model using a regression-kriging algorithm. Considering that a significant portion of the seismic stations is located in urban environment, this inclusion contributes to the accuracy of the estimation of site response in areas with high exposure and it locally reduces its associated uncertainty. Show more
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https://doi.org/10.3929/ethz-b-000594281Publication status
publishedBook title
Proceedings of the Third European Conference on Earthquake Engineering and Seismology – 3ECEESPages / Article No.
Publisher
Editura ConspressEvent
Subject
risk assessment; site amplification; national model; site-condition indicators; regressionOrganisational unit
02818 - Schweiz. Erdbebendienst (SED) / Swiss Seismological Service (SED)
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