A Summary View on the Implications of Available Strong Motion Data on Vrancea Earthquakes

Abstract eng:
The first strong motion data obtained in Romania were due to the occurrence of the Vrancea earthquakes of 1977.03.04, 1986.08.30, 1990.05.30 and 1990.05.31. The need to consider this information as a whole must be strongly emphasized in this view. The paper is devoted to a summary view on the implications of the features of the instrumental data at hand for the features of ground motions originating in the Vrancea seismogenic zone. The features of radiation / attenuation, alternatively in global, directional and spectral terms, are briefly presented. The effect of local conditions on the features of ground motion is then discussed, and locations with a trend to stability of the spectral contents of ground motion, as well as locations with a trend to strong variability of the spectral contents are put to evidence. The importance of the existence of a strong contrast of S wave propagation velocity at a relatively small depth of the local geological columns is referred to. The predictability of the features of ground motion is discussed.

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