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Maps have different purposes

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Readers should be careful about which maps from which design values are
obtained. The USGS probabilistic maps are actually not destined for IBC 2000.
They were amended by the BSSC and now contain a hybrid of probabilistic and
deterministic values. The BSSC's 97 NEHRP Provisions are due out soon from the
printer and should be the source for design value maps. I understand that the
BSSC soon plans to upload their maps. Has anyone looked into this?

Fred Turner
Staff Structural Engineer
Ca. Seismic Safety Commission
1900 K St. #100 Sacramento, CA 95814
916-327-1606 916-322-9476 Fax