Horizon / Plein textes La base de ressources documentaires de l'IRD


Publications des scientifiques de l'IRD

Imtiaz A., Cornou Cécile, Bard P. Y., Zerva A. (2018). Effects of site geometry on short-distance spatial coherency in Argostoli, Greece. Bulletin of Earthquake Engineering, 16 (5), 1801-1827. ISSN 1570-761X

Accès réservé (Intranet IRD) Document en accès réservé (Intranet IRD)

Lien direct chez l'éditeur doi:10.1007/s10518-017-0270-z

Effects of site geometry on short-distance spatial coherency in Argostoli, Greece
Année de publication2018
Type de documentArticle référencé dans le Web of Science WOS:000430837800004
AuteursImtiaz A., Cornou Cécile, Bard P. Y., Zerva A.
SourceBulletin of Earthquake Engineering, 2018, 16 (5), p. 1801-1827. ISSN 1570-761X
RésuméThe spatial variation of the earthquake ground motion over short distances can significantly affect the dynamic response of large and extended engineered structures, especially on sites with inhomogeneity in surface geology and geometry. In current practices, such variation is taken into account in terms of coherency, a function of frequency and distance, established on an essentially empirical basis and difficult to extrapolate at different sites. Hence, a better understanding of its physical significance and its relationship with the underlying ground structure is indispensable. A two-dimensional dense array, deployed at the small and shallow Koutavos-Argostoli valley in Cephalonia, Greece, provided an abundance of data to study the stochastic characteristics of seismic ground motions over very short distances. A set of 46 magnitude 2-5 events at epicentral distances 0-200 km has been selected for the analysis. The lagged coherency of the S-wave dominating seismogram was computed for each station-pair within the array and was averaged over various distance intervals for the whole data set. The results indicate a lack of a clear dependence of the average coherency on the magnitude, back azimuth or site-to-source distance of the event. The most striking result concerns the influence of the site geometry: the coherency is systematically lower for the pairs aligned perpendicular to the axis of the valley (2D) compared to those aligned in the parallel direction. This finding is consistent with the dominance of valley-edge generated surface waves propagating from one edge to the other. The averaged coherency estimates are only weakly represented by the existing parametric models, indicating its strong site dependent nature.
Plan de classementGéologie et formations superficielles [064] ; Géophysique interne [066]
Descr. géo.GRECE
LocalisationFonds IRD [F B010072787]
Identifiant IRDfdi:010072787
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010072787

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL

Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation


Montpellier (centre IRD)

Montpellier (MSE)






La Paz