Note on the inclusion of site classification information in equations to estimate strong ground motions

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Two main regression methods have been proposed for using site category information within ground motion prediction equations, these are: (a) joint estimation of the site category coefficients and the magnitude and distance coefficients; or (b) estimation of site category coefficients by using the residuals from the equation derived without considering soil conditions. Method (a) requires each record be assigned a site category whereas for method (b), because it relies on residuals, site information can be missing for some records. This short note finds that if the mean of the transformed distances within each site category is the same then the two methods give the same site coefficients. If, however, these means are significantly different then method (b) can yield incorrect site coefficients.

Original languageEnglish
Pages (from-to)373-380
Number of pages8
JournalJournal of Earthquake Engineering
Issue number3
Publication statusPublished - Jul 2003


  • attenuation relationships
  • ground motion estimation equations
  • regression techniques
  • strong ground motion

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