Search our library’s catalog with this term
Geographic areas of varying seismic risk within which seismic design requirements for structures are constant
An official website of the United States government Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.