During the past thirty years various accelerogram data sets recorded by “free field” strong-motion stations in Greece have been compiled by two institutes that are in charge of running national strong-motion networks. These data sets have been of limited potential use for research because of nonstandard processing, nonhomogeneous earthquake parameters adopted, and a minimum standard of site characterization based only on surface geology. In addition, given an ever-increasing cumulative number of accelerograms, a database was required to facilitate data selection by users. To satisfy all these issues we have developed HEAD version 1.0—a unified HEllenic Accelerogram Database—which is briefly presented...

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