USGS: Science Topics: volcanic activity

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Volcanic activity

Episodes during which gases, ash, and lava (molten rock) escape from vents in the earth's crust, accompanied by minor tremors.

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Volcano monitoring (15 items)

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Volcano Hazards Program [More info]: Homepage for USGS Volcano Hazards Program with feature stories, and links to worldwide volcano updates, volcanic hazards, reducing volcanic risk, USGS international programs, and resources such as educator's page, videos, and online reports.
Most recent updates for U.S. volcanoes [More info]: Short descriptions of recent volcanic activity in the US.
Natural Hazards - Volcanoes [More info]: News and related information focusing on the hazards associated with volcanoes in the United States.
A volcano rekindled; the renewed eruption of Mount St. Helens, 2004-2006 [More info]
Danger to aircraft from volcanic eruption clouds [More info]: Explanation of problems encountered by aircraft due to volcanic emissions.
Earth tides and volcano monitoring [More info]: Article in the May 28, 1998 issue of Volcano Watch describing of correlation of earth tides to volcanic eruptions and value in monitoring underground magma movement with deformation measurement instruments including tiltmeters and strainmeters.
Eruption warning and real-time notifications [More info]: Describes strategy of volcano warnings and the real-time detection of a sudden eruption or lahar and immediate notification of the activity to the public and local, state, and federal emergency-management officials.
Eruptions from the Inyo chain about 600 years ago: sequence of events and effects in the Long Valley Area [More info]: Describes the volcanic activity that occurred along the southern part of the Mono-Inyo Craters volcanic chain in California about 600 years ago.
Eruptions in the Cascade Range during the past 4,000 years [More info]: Chart showing 13 volcanoes on a map of Washington, Oregon, and northern California, along with time lines for each volcano showing the ages of their eruptions.
Eruptions of Hawaiian volcanoes - past, present, and future [More info]: Originally published in 1987, this general-interest booklet has been revised in anticipation of the Centennial of the Hawaiian Volcano Observatory (HVO) in January 2012.

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