A holistic approach of numerical analysis of the geology effects on ground motion prediction: Argostoli site test
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ORIGINAL ARTICLE
A holistic approach of numerical analysis of the geology effects on ground motion prediction: Argostoli site test Sara Touhami · Fernando Lopez-Caballero Didier Clouteau
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Received: 16 August 2019 / Accepted: 13 October 2020 © Springer Nature B.V. 2020
Abstract When assessing seismic risk at a city scale, local site conditions can significantly modify the destructive potential of an earthquake. This was the case in Mexico City in 1985 and 2017, which is located on a sedimentary valley. For that reason, characterization and consideration of these site effects, in addition to assessing the probability of occurrence of a destructive earthquake in a given region, are crucial. For this purpose, a tri-dimensional model was developed using a numerical code that permits to carry out such kind of studies. The code is based on the spectral element method allowing solving the waves propagation problem in tri-dimensional solid media. The seismic phenomenon is simulated in its entirety: from the seismic source to the site using a representative model of the complexity of the wave path. However, this introduces uncertainties that must be quantified, controlled and reduced by validating the results of the numerical tool with measurements on a real study site. This work aims to study numerically the effect of the geometric structure of soil and subsoil on the prediction of ground motion at the regional scale. The first obtained results show the importance of the in situ measures on the regional-scale simulations.
S. Touhami () · F. Lopez-Caballero () · D. Clouteau Laboratoire MSS-Mat CNRS UMR 8579, CentraleSupelec Paris-Saclay University, Gif-sur-Yvette, France e-mail: [email protected] e-mail: [email protected]
Keywords 3D numerical modelling · Ground motion prediction · Regional model · Spectral element method
1 Introduction An accurate prediction of the seismic response of civil engineering structures, especially those of the utmost importance in terms of civil safety, such as hospitals, dams, bridges or nuclear power plants, faces several major difficulties. It is well known that to better characterize the seismic phenomenon several parameters such as site effects (basins, topographie, etc.) have to be considered. Indeed, during the wave propagation process, the soil near the surface can have an effect of amplification or de-amplification on the ground motion. This may be related to soil type (soft), geology or soil heterogeneity among others. Traditional methods for soil motion evaluation use prediction equations developed empirically by regression of seismic recording data. However, in areas of low seismicity like France, there is not enough data to create this type of equation and thus predict the local seismic hazard. These equations are therefore specific to each region of the world. It is then possible to use numerical simulation tools to complete the lack of measured data. As far as prediction of the seismic motion is concerned, source propagation and sit
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