This site is in an archived state. The content remains accessible as a public resource.

This site was developed with support from the Federal Emergency Management Agency

NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Buildings (FEMA 450, Long Period Maps)


FEMAThese guidelines were prepared for FEMA by the Building Seismic Safety Council (2003 edition). Long period maps show long period transition for the United States and territories.