Earthquake Zone of Tucson
Tucson's earthquake zone classification is 2-A.
The website of the U.S. Geological Survey, http://www.usgs.gov, is a good source of earthquake information.
Per Richard A. Trapp, Arizona Geological Survey. Mr. Trapp says this information is from the 1994 Uniform Building Code. http://www.azgs.state.az.us.
(Telephone call made by PCPL staff 09/27/2003.)