Seismic Waves is a newsletter published by the National Earthquake Hazards Reduction Program [NEHRP]. "Throughout most municipalities of the United States, structural engineers design new buildings using the U.S.-focused 'International Building Code' (IBC). Updated editions of the IBC are published every 3 years. The latest edition (2012) contains new 'risk-targeted maximum considered earthquake' (MCER) ground motion maps, which are enabling engineers to incorporate a more consistent and better-defined level of seismic safety into their building designs. The new maps were developed by the Building Seismic Safety Council and its Seismic Design Procedures Reassessment Group, in collaboration with the U.S. Geological Survey (USGS) and with funding from the Federal Emergency Management Agency (FEMA), two of the agencies that participate in the National Earthquake Hazards Reduction Program (NEHRP). Following their initial publication in the 2009 'NEHRP Recommended Seismic Provisions for New Buildings and Other Structures' (FEMA P--750), the maps were adopted into the 2010 edition of the American Society of Civil Engineers (ASCE) Standard ASCE/SEI 7--10, 'Minimum Design Loads for Buildings and Other Structures', and subsequently into the 2012 IBC. The 2012 'International Residential Code' (IRC), which governs the design and construction of one- and two-family dwellings, contains similar new maps (see figure 1)."
National Earthquake Hazards Reduction Program: http://www.nehrp.gov/
Seismic Waves (June 2012)