Génération d'accélérogrammes synthétiques large bande par méthode hybride : application au seisme de Niigata

Mickael Delatre (1) , Hideo Aochi (1)

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)

Hisada proposes as an hybrid method to add low-frequency deterministic results with high-frequency stochastic results produced by the sum of virtual sources with random phase pondered by radiation coefficients (Onishi and al, 2004). We show that the random phase hypothesis leads to unrealistic accelerograms : high-frequency accelerations are not localised in time. We propose therefore to relocate in time high frequency accelerations by using an exponential weighting function over the high-frequency source function. This method is applied to the 2007 Niigata Chuetsu Oki earthquake : high-frequency parts of the spectra reproduce the observations,

Keywords: stochastique; hybride; relocalisation haute fréquence; Niigata

Domains: Geophysics [physics.geo-ph]; Geophysics [physics.geo-ph]; Global Changes

Mickael Delatre, Hideo Aochi. Génération d'accélérogrammes synthétiques large bande par méthode hybride : application au seisme de Niigata. 8ème Colloque National AFPS, Vers une maitrise durable du risque sismique, Sep 2011, Champs-Sur-Marne, France. ⟨hal-00612060⟩