Publication Date:
2023-07-31
Description:
In the framework of the Risk Model Switzerland, Risk Model Basel and Urbasis projects, selected areas in Switzerland were used to derive local amplification models combining geological, seismological and geophysical data. The chosen sites are Visp and Sion located in the Canton of Valais in southwest Switzerland, Lucerne a densely populated city located in central Switzerland and Basel located in the northwest of Switzerland. In the area of Visp, different amplification models are derived by means of 3D simulations and statistical correlation of horizontal-to-vertical spectral ratio and empirical amplification functions. Additionally, a further strategy for the prediction of amplification is presently being calibrated using the quarter wavelength method as a direct empirical modelling approach to estimate amplification from synthetic S-wave velocity profiles extracted from the 3D model. Instead, in the Sion, Basel and Lucerne areas beyond the statistical correlation of horizontal-to-vertical spectral ratio with empirical amplification functions as in Visp, also a method combining noise and earthquake standard spectral ratio is used. Thanks to the available database of geophysical data and empirical amplification functions Switzerland is a good laboratory in which different techniques to map amplification can be tested and compared highlighting the advantages and limitations.
Language:
English
Type:
info:eu-repo/semantics/conferenceObject
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