This paper studies the horizontal components of 11 significant ground motion recordings from Romania and from the world. The dimensionless indicators ε (Cartwright & Longuet-Higgins) and q (Vanmarcke) are used as stochastic measures of frequency content to characterize these ground motions. For sigle degree of freedom (SDOF) systems having different natural periods and 5% damping ratio, displacement responses have been determined to the following ground motions: 1977, 1986 and 1990 - Vrancea region, 1940 - El Centro, 1978 - Tangshan, 1979 - Montenegro, 1985 - Mexico City, 1995 - Kobe, 1999 - Kocaeli, 1999 - Duzce and 2010 - Chile. Structural responses are presented in terms of mean of maximum response and maximum response with P non-exceedance probability, where P takes the values of 10%, 50% and 90%. The results are presented in tables and graphics showing the variation of the seismic response with the natural period of the SDOF system. The conclusions drawn after these earthquakes regarding the behavior of different types of structures have been once again confirmed by this study. Correlations between the frequency content of the ground motions studied and the damages observed were also made. The paper emphasizes the importance of choosing for a future building the structural type that fits best the site's soil characteristics. Keywords: ground motion, stochastic response, transfer function, power spectral density, natural period.

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