Numerical modelling of the seismic site effects in Lisbon: role of buried and surficial morphology

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Publication Title
Numerical modelling of the seismic site effects in Lisbon: role of buried and surficial morphology

Abstract
It is recognised that site effects have a great impact on seismic ground motion characteristics and this can lead to higher structural damage. Lisbon has a moderate to high seismic risk due to its historical seismicity, socio-economic importance and dense urbanisation. Furthermore, its geological setting is characterised by a complex lithostratigraphic structure, complex buried and surficial morphologies, shear wave velocity inversion and weathered rock layers. To assess the seismic site effects in Lisbon, a site response numerical analysis was performed along a profile characterised by the presence of a topographic relief and slightly inclined layers, considering the available geotechnical and geophysical data and the two types of seismic action defined in the Portuguese Annex of Eurocode 8. The results are shown in terms of amplification factors and acceleration response spectra at selected points. The physical phenomena governing the site response were also investigated by comparing 1D and 2D numerical analyses. At the top of the crest, an amplification factor equal to 3 was estimated within the period range of 0.05-2.50 s, which is related to bidimensional topographic effects.
Authors
L. Oliveira; R. C. Gomes; Sara Amoroso; A. Pagliaroli; P. Teves-Costa

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

B - Geohazards

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