The branch of geology that deals with volcanism and the processes involved in magma flow and eruption through a vent in the earth's surface.
Preparing for volcanic emergencies [ More info] Describes activities of USGS scientists to increase public awareness of volcano hazards with links to publication and videos for public information on understanding and preparing for volcanic hazards.
Satellite technologies detect uplift in the Yellowstone Caldera [ More info] Explanation of uplift in the land surface of the northern part of the Yellowstone caldera (12cm, about ~5 inches) that occurred between 1997 and 2003, including the scientific methods by which it was detected and analyzed.
Scientific drilling in Long Valley, California: What will we learn? [ More info] Description of 1998 drilling project at Long Valley Exploratory Well located on Long Valley Caldera's resurgent dome to monitor changing conditions beneath the dome. (Document in PDF format.)
Selected volcano information [ More info] Selected books, maps, videos, and other materials produced by the USGS Volcano Hazards Program. Many products highlighted here are intended for general audiences.
Sutter Buttes-the lone volcano in California's Great Valley [ More info] Explains history and structure of this unusual geologic feature.
The story of the Hawaiian Volcano Observatory -- A remarkable first 100 years of tracking eruptions and earthquakes [ More info] History of the Hawaiian Volcano Observatory (HVO), established in 1912, including an overview of Hawaiian volcanic processes and USGS monitoring techniques.
Types and effects of volcano hazards [ More info] Describes the 6 main types of hazardous activities and processes associated with volcanoes, including tephra, lava flows, pyroclastic flows, lahars (volcanic mudflows), landslides, and volcanic gas.
U.S. Geological Survey (USGS) Western Region Kasatochi Volcano Coastal and Ocean Science [ More info] Long-term studies to better understand the effects of the eruption and the role of volcanism in structuring ecosystems in the Aleutian Islands, a volcano-dominated region with high natural resource values.
Using tiltmeters to measure volcano deformation [ More info] Describes and illustrates how scientists use electronic tiltmeters measuring deformation on volcanoes.
Volcano and hydrologic hazards, features, and terminology [ More info] Links to explanations of volcanic hazards and features and to a glossary of volcano terminology.
Alphabetical Index of Topics
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