Soil amplification in the Santiago city, Chile, due to shallow crustal earthquakes

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dc.coverageDOI: 10.1016/j.soildyn.2024.108633
dc.creatorOrtiz, Fabián
dc.creatorPastén, César
dc.creatorBustos, José
dc.creatorRuiz, Sergio
dc.creatorAstroza, Rodrigo
dc.creatorEaston, Gabriel
dc.date2024
dc.date.accessioned2025-11-18T19:49:50Z
dc.date.available2025-11-18T19:49:50Z
dc.description<p>Three-dimensional physics-based numerical simulations (3D-PBS) of the seismic response of the Santiago Basin, Chile, were performed considering a large-scale velocity model and shallow crustal earthquake scenarios, associated with the west-verging thrust San Ramón Fault. Numerical results show that competent gravelly soils in the center of the basin respond with low seismic amplification and shorter durations of strong ground motions, unlike less competent fine-grained soils in the northern area. A significant increase in the seismic intensities is observed in the vicinity of rock outcrops, attributable to the generation of surface waves. Seismic amplification factors were calculated with respect to a reference site on gravel and their values show high levels of amplification in the vicinity of the seismic source, and on soils with low shear wave velocities (V<sub>s</sub>) and long fundamental vibration periods. On the other hand, empirical ground motion models (GMM) were used to estimate amplification factors for peak ground accelerations and spectral accelerations at various periods. Results from GMMs and 3D-PBS were compared, showing similarities in the attenuation pattern on stiff soils, but differences in soils with low V<sub>s</sub>. Moreover, 3D-PBS captured site effects associated with the local geomorphology, unlike GMMs.</p>eng
dc.identifierhttps://investigadores.uandes.cl/en/publications/bccb539d-91b0-4da7-b42d-3b421c3bdb84
dc.identifier.urihttps://repositorio.uandes.cl/handle/uandes/56306
dc.languageeng
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.sourcevol.181 (2024) p.1-19
dc.subjectGround motion models
dc.subjectPhysics-based numerical simulations
dc.subjectSeismic amplification
dc.subjectShear-wave velocity model
dc.subjectSite effects
dc.titleSoil amplification in the Santiago city, Chile, due to shallow crustal earthquakeseng
dc.typeArticleeng
dc.typeArtículospa
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