Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; April 2006; v. 96; no. 2; p. 748-749; DOI: 10.1785/0120050203
© 2006 Seismological Society of America
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Reply to "Comment on ‘Nonlinear Soil-Site Effects in Probabilistic Seismic-Hazard Analysis’ by Paolo Bazzurro and C. Allin Cornell," by Jonathan P. Stewart and Christine A. Goulet

Paolo Bazzurro1 and C. Allin Cornell

1 AIR Worldwide Co.
388 Market Street, Suite 750
San Francisco, California 94111
pbazzurro@air-worldwide.com
 (P.B.)
2 Civil and Environmental Engineering Department
Stanford University
Stanford, California 94305
 (C.A.C.)

The first 20% of the full text of this article appears below.

We thank Stewart and Goulet for taking an interest in our work and for bringing to our attention the article by Baturay and Stewart (2003), which should have been included in our reference list. Unlike the approach presented in our article, the article by Baturay and Stewart tackles the problem of quantifying the effects of local soil to the incipient seismic waves using an empirical rather than an analytical procedure.

We certainly agree with the conclusions reached by Stewart and Goulet stating the applicability of both methodologies for seismic-hazard estimation of critical facilities. Our approach, which is predominantly analytical, undoubtedly benefits from a comparison with a procedure that is based on observations. In Figure 1 of their discussion, Stewart and Goulet provide a useful comparison of the record- to-record variability, Formula , of the elastic spectral acceleration at the soil surface, Formula , for f = 3.33 Hz, conditional on the level of peak ground acceleration (PGA) at the bedrock that derives from the application of both procedures to different National Earthquake Hazards Reduction Program (NEHRP) soil categories and to soft-soil sites. We were pleased to see that this comparison is very favorable and that the values from both approaches appear to be statistically indistinguishable. This enhanced the credibility of both procedures. Note, however, that the values of Formula in Figure 1 computed using the analytical method by Bazzurro and Cornell could potentially be reduced. Of course, reducing the variability in the surface spectral acceleration is . . . [Full Text of this Article]


Related articles in Bulletin of the Seismological Society of America:

Nonlinear Soil-Site Effects in Probabilistic Seismic-Hazard Analysis
Paolo Bazzurro* and C. Allin Cornell
Bulletin of the Seismological Society of America 2004 94: 2110-2123. [Abstract] [Full Text]  

Ground-Motion Amplification in Nonlinear Soil Sites with Uncertain Properties
Paolo Bazzurro and C. Allin Cornell
Bulletin of the Seismological Society of America 2005 95: 2027. [Extract] [Full Text]  





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