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

Details 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 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

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009geoji.179.1627c&link_type=abstract

Geophysical Journal International, Volume 179, Issue 47, pp. 1627-1644.

Astronomy and Astrophysics

Astronomy

1

Earthquake Ground Motions, Site Effects, Europe

Scientific paper

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.

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