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Re: Re: Questions on UBC-97 Seismic code

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The site class factors were developed at a joint NCEER/SEAOC/BSSC workshop
held in 1992 and were based on strong-motion recordings comparing rock and
nearby soil recordings and then using empirical regression curve fitting,
averaging, and judgement Fa and Fv values were developed. These comprise the
site class part of Ca, Cv values in the 97 UBC. Check out page 498 et seq of
the 96 SEAOC Blue Book. For more info, try the BSSC Commentary on the NEHRP
Provisions 94 or 97 editions.  

Fred