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Tucson Seismic Zone

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Actually, neither.

Tucson and Pima County have <shudder> adopted the IBC and IRC, with very few 
local ammendments.  Previously, when the UBC showed southern Arizona in 
Seismic Zone 1, local ammendments kept us in Seismic Zone 2, albeit, 2A, 
until we got the UBC to show us in 2A.  2A was comparable to the .075W for 
low rise structures that previous editions of the UBC required us to design 
for.  2B would have had us design for .09W and there was too much reluctance 
for that.

I would suggest that you use your good judgement for seismic design.  I keep 
in mind the May 3, 1887, earthquake centered in Mexico which shook up 
southern Arizona and the southwest, being felt from El Paso on the east to 
Yuma on the west and from Mexico City to the south and Albuquerque to the 


A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Michael Bryson wrote:

. > Can someone tell me what seismic zone Tucson, AZ, is on? 2A or 2B?

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