Postprint version. Published in Earthquake Spectra, Volume 21, Issue 1, February 1, 2005, pages 277-279.
The definitive version is available at https://doi.org/10.1193/1.1851547.
Civil and Environmental Engineering
2005 Earthquake Engineering Research Institute. This article may be downloaded for personal use only. Any other use requires prior permission of the Earthquake Engineering Research Institute.