ANSS-Advanced National Seismic System Advancing National Seismic Safety-Accomplishments FY2002 [open pdf - 2MB]
"The Advanced National Seismic System (ANSS) provides accurate and timely information about seismic events and their effects on buildings and structures using modern monitoring methods and technologies. Continuing the original objective conceived in the 1980's of a National Seismic System, ANSS strives to unify seismic monitoring in the United States. It provides a framework to modernize instrumentation and revolutionize data availability for research, engineering, and public safety."
U.S. Geological Survey: http://www.usgs.gov/