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.
Earthquake information by topic [ More info] Information on earthquakes by topic including faults, tsunami, seismic waves, and plate tectonics.
Earthquake notification services [ More info] Sign up for USGS real-time earthquake notification services.
Earthquake preparedness information [ More info] Links to web sites, publications, and fact sheets on earthquake preparedness.
Earthquake science explained--a series of ten short articles for students, teachers, and families [ More info] Collects a series of short articles on earthquake science and related topics for students, teachers, and parents originally published as weekly features in The San Francisco Chronicle.
Earthquake search [ More info] Search interface allowing searches of earthquake databases by various parameters including date, depth, intensity, area, and magnitude and download data in a variety of formats.
Earthquake: Did you feel it? Report it here. [ More info] Place to provide information about ground shaking associated with significant earthquakes. A questionnaire to let us know what you felt following an earthquake in the United States or in other countries.
Earthquakes [ More info] Online booklet on earthquake history, earthquake occurrences, measuring earthquakes, causes, relationship of volcanoes and earthquakes and earthquake prediction.
Earthquakes and tsunamis in Puerto Rico and the U.S. Virgin Islands [ More info] Fact sheet on hazards from earthquakes and tsunamis in Puerto Rico and the U.S. Virgin Islands to be downloaded as a PDF file or viewed as an Adobe Acrobat Reader file.
Earthquakes for kids [ More info] Links to various earthquake projects, facts, science fair ideas, earthquake science, becoming an earthquake scientist, image glossary, earthquake facts, and puzzles and games for children.
Earthquakes in Hawaii -- an underappreciated but serious hazard [ More info] Shows where earthquakes occur here, the type of damage that has occurred, and the information that USGS provides to help people anticipate and understand this hazard.
Alphabetical Index of Topics
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