http://oemg.er.usgs.gov/fact-sheets/earth-science-information/earthquake.html
The National Earthquake Information Center (NEIC), a part of the Department of the Interior, U.S. Geological Survey, is located in Golden, Colorado, 10 miles west of Denver. The NEIC rapidly collects and disseminates information on earthquakes within the United States and worldwide. It is the national data center and archive for earthquake information. The NEIC routinely publishes earthquake data volumes and bulletins, and reports on earthquake occurrences and earthquake effects.