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The paper presents results from a recent study in progress, involving anextensive analysis, based on several deterministic and stochastic indices, ofthe frequency content of ground motions recorded during strong Vrancea seismicevents. The study, continuing those initiated by Lungu et al. in the earlynineties, aims to better reveal the characteristics of the analyzed groundmotions. Over 300 accelerograms, recorded during the strong Vrancea seismicevents mentioned above and recently re-digitized, are used in the study.Various analytical estimators of the frequency content, such as those based onFourier spectra, power spectral density, response spectra and peak groundmotion values are evaluated and compared. The results are correlated andvalidated by using the information provided by various spectral bandwidthmeasures, as the Vanmarcke and the Cartwright and Longuet-Higgins indices. Thecapacity of the analyzed estimators to describe the frequency content of theanalyzed ground motions is assessed comparatively and the most relevantparameters are being identified.

Investigation of the frequency content of ground motions recorded during strong Vrancea earthquakes, based on deterministic and stochastic indices