Predicting short-period spectral ordinates of hybrid ground shaking prediction tools: a comparative benchmark

F Gatti (1) , Fernando Lopez‐caballero (2, 1)

1 MSSMat - Laboratoire de mécanique des sols, structures et matériaux
2 CentraleSupélec

This study represents an attempt to unravel the complex relationship between the propagated wave-field and the statistical properties of the regional medium (e.g. the correlation model and length of the heterogeneities and the intrinsic attenuation). This objective is pursued by inspecting the broad-band (0-30 Hz) synthetic wave-forms obtained by source-to-site 3-D numerical simulations in regional-size scenarios. A narrow heterogeneous domains (of a few tens of meters width) is embedded inside a homogeneous half-space, between the source depth and the free-surface (where the wave-field is monitored by a dense array of stations). The presented numerical benchmark compares the major differences obtained when including or not the heterogeneous domain in the model. The high-frequency attenuation is assessed by computing the κ coefficient for different source-station configurations.

Domaines: Génie civil nucléaire; Risques

F Gatti, Fernando Lopez‐caballero. Predicting short-period spectral ordinates of hybrid ground shaking prediction tools: a comparative benchmark. 13th International Conference on Applications of Statistics and Probability in Civil Engineering(ICASP13), May 2019, Seoul, South Korea. ⟨hal-02142978⟩