Journal articles
New approach for coupling k−2 and empirical Green's functions: application to the blind prediction of broad-band ground motion in the Grenoble basin
Abstract : We present a new approach for performing broad-band ground motion time histories (0.1–30 Hz) of a future earthquake in a sedimentary basin. Synthetics are computed with an hybrid scheme combining reciprocity-based 3-D-spectral element method simulations at low frequencies and empirical Green's functions (EGF) at high frequencies. The combination between both deterministic and empirical parts results in a set of hybrid Green's functions, summed according to a new k−2 kinematic model algorithm. The summation technique enables to remove the high-frequency artefacts that appear above the EGF corner frequency. The ground motion variability is assessed by generating a variety of source parameter sets selected from a priori probability density functions. This leads to a population of response spectra, from which the median spectral acceleration and standard deviation values are derived. The method is applied to simulate a MW 5.5 event in the deep Grenoble basin (French Alps). The comparison with EC8 regulations suggests the need of specific design spectra in the Grenoble valley.
https://hal-insu.archives-ouvertes.fr/insu-00498638
Contributor : Pascale Talour Connect in order to contact the contributor
Submitted on : Friday, March 5, 2021 - 4:38:54 PM
Last modification on : Tuesday, October 19, 2021 - 6:58:21 PM
Long-term archiving on: : Sunday, June 6, 2021 - 7:18:42 PM
Contributor : Pascale Talour Connect in order to contact the contributor
Submitted on : Friday, March 5, 2021 - 4:38:54 PM
Last modification on : Tuesday, October 19, 2021 - 6:58:21 PM
Long-term archiving on: : Sunday, June 6, 2021 - 7:18:42 PM
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