"This guide lists acronyms and abbreviations commonly used by the United States federal government. Each acronym is defined and links to the home page (or best alternative) of the identified department, agency, office, program or publication." --from web site
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"Earthquakes pose significant risk to 75 million Americans in 39 States. The USGS is the only Federal agency with responsibility for recording and reporting earthquake activity nationwide. Citizens, emergency responders, and engineers rely on the USGS for accurate and timely information on where an earthquake occurred, how much the ground shook in different locations, and what the likelihood is of future significant ground shaking." from web site