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Earthquakes
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.
Subtopics:
Earthquake occurrences (42 items)

Earthquake hazards (51 items)
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Results 31 - 40 of 94 listed alphabetically [list by similarity]
Earthquakes in the central United States, 1699-2010 [More info]
Poster includes GIS data for earthquake locations in this seismically active area.
PDF Earthquakes pose a serious hazard in Afghanistan [More info]
Structural features in eastern Afghanistan accompany seismicity data showing this area is subject to considerable risk of earthquakes.
Earthquakes: Frequently Asked Questions [More info]
Answers to a wide variety of questions (FAQs) about earthquakes, such as dictionary of terms, earthquake activity and probabilities, common myths, faults, plate tectonics, and earthquake measurement techniques.
Executive summary, workshop: seismic and tsunami hazard in Puerto Rico and the Virgin Islands [More info]
Summary of workshop with links to reports that are recommendations for future projects.
PDF Facing the great disaster: How the men and women of the U.S. Geological Survey responded to the 1906 "San Francisco Earthquake" [More info]
After the powerful earthquake of April 18, 1906, staff of the U.S. Geological Survey stationed in Sacramento and Berkeley brought help to the residents of devastated San Francisco, documented the effects of the quake, and investigated its causes.
Fault and fold database of the United States [More info]
Online database of faults and associated folds in the United States that are believed to be sources of significant earthquakes during the last 1.6 million years.
PDF Field reconnaissance report of landslides triggered by the January 12, 2010, Haiti earthquake [More info]
Preliminary aerial helicopter reconnaissance of areas affected by landslides and ground inspections at some accessible landslide sites.
PDF Forecasting California's earthquakes - What can we expect in the next 30 years? [More info]
Shows how we know severe earthquakes will occur and where.
General Earthquake Observation System (GEOS) [More info]
Earthquake and aftershock data collected by the USGS General Earthquake Observation System project in Menlo Park, California.
Geologic hazards team [More info]
An organizational unit within USGS that studies earthquakes, landslides, and geomagnetism. Contact information and descriptions of current research projects.
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