Ground shaking caused by the sudden release of accumulated strain by an abrupt shift of rock along a fracture in the earth or by volcanic or magmatic activity, or other sudden stress changes in the earth.
The San Andreas Fault [ More info] Online booklet on the San Andreas fault system on the California coastal region with discussion of faults, relationship of faults and earthquakes, magnitude of earthquakes, and earthquake probability.
The U.S. Geological Survey Ocean Bottom Seismometer Facility [ More info] The Ocean Bottom Seismometer facility provides technical support for a variety of scientific investigations ranging from deep crustal structure to gas hydrate and surface sediments.
United States National Seismic Hazard Maps [ More info] Maps indicating areas where earthquakes may cause damage or disrupt human activities, with information about how those maps are compiled.
USGS and the Southern California Integrated GPS Network (SCIGN) [ More info] Field Office involved in operating GPS stations, data recording, and supplying of earthquake data. Links to GPS data analysis, photos, and technical information.
Volcano monitoring at Yellowstone National Park [ More info] Describes volcano monitoring at Yellowstone National Park including an update of recent volcanic activity, real-time data, and link to volcano monitoring techniques information.
Western Region geologic information [ More info] Links to geologic information on western states: Alaska, Arizona, California, Hawaii, Idaho, Nevada and Oregon including information on coastal and marine geology, mineral resources, earthquakes, landslides, earthquake hazards and geologic maps.
What is an Ocean Bottom Seismometer? [ More info] Description and uses of the Ocean Bottom Seismometer; a self contained data-acquisition system which free falls to the ocean floor and records seismic data generated by airguns and earthquakes.
Alphabetical Index of Topics
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