The United States Geological Survey (USGS) is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization has four major science disciplines, concerning biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility.
A bureau of the United States Department of the Interior, it is that department's sole scientific agency. The USGS employs approximately 10,000 people and is headquartered in Reston, Virginia, where the entrance to the parking lot is marked by several stones from the Devils Postpile National Monument. The USGS also has major offices in Denver, Colorado, and Menlo Park, California.
1879–1881 Clarence King
1881–1894 John Wesley Powell
1894–1907 Charles Doolittle Walcott
1907–1930 George Otis Smith
1930–1943 Walter Curran Mendenhall
1943–1956 William Embry Wrather
1956–1965 Thomas Brennan Nolan
1965–1971 William Thomas Pecora
1971–1978 Vincent Ellis McKelvey
1978–1981 Henry William Menard
1981–1993 Dallas Lynn Peck
1994–1997 Gordon P. Eaton
1998–2005 Charles G. Groat
2006-present Mark Myers List of USGS Directors:
The USGS is the primary civilian mapping agency in the United States, and is best known for its 1:24,000 scale, 7.5-minute quadrangle topographic maps. Their recent program, the National Map, is an attempt to be the ultimate online mapping service for the United States. The USGS also has a vigorous Business Partners program through which they encourage the reselling of their maps so that the public can have quicker, easier access to information. Many commercial sites have capitalized on this program to provide web mapping services in conjunction with the USGS.
The USGS Earthquake Hazards Program monitors earthquake activity worldwide. The National Earthquake Information Center (NEIC) in Golden, Colorado on the campus of the Colorado School of Mines detects the location and magnitude of global earthquakes. The USGS also runs or supports several regional monitoring networks in the U.S. under the umbrella of the Advanced National Seismic System (ANSS). The USGS informs authorities, emergency responders, the media, and the public, both domestic and worldwide, about significant earthquakes. It also maintains long-term archives of earthquake data for scientific and engineering research. It also conducts and supports research on long-term seismic hazards.
The USGS National Geomagnetism Program monitors the magnetic field at magnetic observatories and distributes magnetometer data in real time.
Since 1962, it has been involved in global, lunar and planetary exploration and mapping.
The USGS also operates the National Wildlife Health Center, whose mission is "to serve the nation and its natural resources by providing sound science and technical support, and to disseminate information to promote science-based decisions affecting wildlife and ecosystem health. The NWHC provides information, technical assistance, research, education, and leadership on national and international wildlife health issues."  It is the agency primarily responsible for surveillance of wild-animal H5N1 avian flu outbreaks in the United States.
As of 2005, the agency is working to create a National Volcano Early Warning System by improving the instrumentation monitoring the 169 volcanoes in U.S. territory and by establishing methods for measuring the relative threats posed at each site.
The motto of the USGS is "Science for a changing world."
The USGS also runs 17 biological research centers in the United States, including the Patuxent Wildlife Research Center.