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The paper presents results of a comprehensive study of ground motionsrecorded during the strong earthquakes (moment magnitude Mw > 6) generatedduring last 34 years by the seismic source of Vrancea, Romania. By analyzingover 300 accelerograms, the capacity of different expressions in the literatureto estimate the predominant period of a ground motion is compared. Thecorrelation between the values obtained from different evaluations is assessedas well. The dependence of the predominant period of different factors ofinfluence is analysed. Comparisons are made between the parameters determinedfor the same seismic event at different stations, as well as for ground motionsrecorded on the same site at successive earthquakes. The results areinterpreted in correlation with the information provided by frequency bandwidthparameters. Considerations are made on the measure in which the influence onthe frequency content of the source and of local geological conditions can beseparated, for seismic motions recorded on different locations.

Evaluation des differents parametres utilises pour l'estimation du  contenu en frequences des mouvements du sol, avec application aux forts  tremblements de terre de Vrancea, Roumanie