Tavakoli and Pezeshk (2005) conclude that the use of a point-source single-corner source spectrum by Campbell (2003, 2004) causes his eastern North America (ENA) hybrid empirical ground-motion model to underestimate ground-motion amplitudes from near-source large-magnitude earthquakes. This conclusion was based on published studies that found that the use of a double-corner source spectrum, together with a focal depth that increases with magnitude, was required to match a dataset of strong-motion recordings from moderate-to-large earthquakes in California (Atkinson and Silva, 1997, 2000). Tavakoli and Pezeshk also note that Atkinson and Boore (1995, 1997) propose the use...

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