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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 (52 items)
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Results 71 - 80 of 96 listed by similarity [list alphabetically]
Volcano Hazards Program, California Volcano Observatory [More info]
Overview of volcano hazards in California with links to monitoring data including earthquakes and deformations, long-term outlook, volcano hazards in the area, USGS response plan, image gallery, monitoring and topical studies, publications and references.
PDF A volcano rekindled; the renewed eruption of Mount St. Helens, 2004-2006 [More info]
Advanced National Seismic System (seismic network) [More info]
A program of studies with instruments to provide accurate and timely data and information on seismic events, including their effects on buildings and structures, employing modern monitoring methods and technologies.
Advanced National Seismic System: Products and services [More info]
Maps, data, and services provided to help people understand earthquakes that have occurred.
Albuquerque Seismological Lab [More info]
The USGS Seismological Laboratory in Albuquerque installs and maintains a world network of seismograph stations, collects the seismic data, and evaluates seismic instruments. Site includes links to ASL publications, earthquake maps and seismic data.
ANSS - Advanced National Seismic System [More info]
Nationa network of seismic monitoring stations coordinated with a variety of regional organizations and academic institutions.
PDF California's restless giant: the Long Valley Caldera [More info]
Geological characteristics of this volcanic area, and volcanic activity, especially swarms of small earthquakes, which may precede eruptions and which are monitored by USGS.
Earth science photographic archive [More info]
Photographic archive collection from the USGS Photo Library. Photos dated 1868-1992 are of geology, earthquake damage, national parks, pioneer photographers, St. Helens eruption and mining and available at 100, 700 and 1400 dots/inch resolution.
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.
FAQs - National Seismic Hazard Maps [More info]
Provides detailed technical information on earthquake hazards in the form of frequently asked questions. Designed for the technical audience, including building and safety planners.
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