Realistic determination of earthquake ground-motion site amplification is an important aspect of seismic hazard analysis. The state of the practice is to characterize sites based on the average shear-wave velocity of the top 30 meters of underlying materials (V30) and use empirical relationships developed by Borcherdt (1994) to quantify the site amplification. The choice of 30-meter depth comes from the fact that most engineering bore logs do not exceed this depth. Borcherdt (1992, 1994), Seed et al. (1992), Dobry et al. (1992), Martin and Dobry (1994), and Boore...

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