The recent paper “Sigma: Issues, Insights, and Challenges” by Strasser et al. (2009) provided an excellent review of the complexity and dependency of the standard deviation σ of ground motion, as well as the difficulty in reducing it. Strasser et al. (2009) concluded that “the value of σ has remained fairly stable over the past 40 years,” although there have been systematic efforts to reduce it (Atkinson and Boore 2003; Abrahamson and Silva 2008; Strasser et al. 2008). In other words, Strasser et al. (2009) showed that the prospects of...

First Page Preview

First page PDF preview
You do not currently have access to this article.