Skip to main content
U.S. flag

An official website of the United States government

Updates to building-code maps for the 2015 NEHRP recommended seismic provisions

December 1, 2015

With the 2014 update of the U.S. Geological Survey (USGS) National Seismic Hazard Model (NSHM) as a basis, the Building Seismic Safety Council (BSSC) has updated the earthquake ground motion maps in the National Earthquake Hazards Reduction Program (NEHRP) Recommended Seismic Provisions for New Buildings and Other Structures, with partial funding from the Federal Emergency Management Agency. Anticipated adoption of the updated maps into the American Society of Civil Engineers Minimum Design Loads for Building and Other Structures and the International Building and Residential Codes is underway. Relative to the ground motions in the prior edition of each of these documents, most of the updated values are within a ±20% change. The larger changes are, in most cases, due to the USGS NSHM updates, reasons for which are given in companion publications. In some cases, the larger changes are partly due to a BSSC update of the slope of the fragility curve that is used to calculate the risk-targeted ground motions, and/or the introduction by BSSC of a quantitative definition of “active faults” used to calculate deterministic ground motions.

Publication Year 2015
Title Updates to building-code maps for the 2015 NEHRP recommended seismic provisions
DOI 10.1193/042015EQS058M
Authors Nicolas Luco, Robert Bachman, C.B Crouse, James R. Harris, John D. Hooper, Charles A. Kircher, Phillp Caldwell, Kenneth S. Rukstales
Publication Type Article
Publication Subtype Journal Article
Series Title Earthquake Spectra
Index ID 70184219
Record Source USGS Publications Warehouse
USGS Organization Geologic Hazards Science Center