Clear evidence of seismic damage due to local geology was first observed in Japan, during the 1923 Kanto earthquake. Several recent earthquakes (e.g., Michoacan, Mexico, 1985; Dahshore, Egypt, 1992; Northridge, U.S.A., 1994; Kobe, Japan, 1995, and Athens, Greece, 1999) clearly indicate that understanding local site effects is one of the major challenges of seismic risk mitigation. Several techniques are employed to compute the site response for soft deposits (i.e., resonance frequencies and amplification factor). Measuring microtremors based on the analysis of ambient noise has been regarded as one of the preferred approaches in estimating site responses,...

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