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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 (16 items)
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Results 51 - 60 of 71 listed by similarity [list alphabetically]
Volcanoes of Hawaii feature stories archive [More info]
Archive of feature stories on volcanic features on the Big Island, guided tours of Hawaii Volcanoes National Park, eruptions and eventful earthquakes, and other topics about the work of scientists at the Hawaiian Volcano Observatory.
Volcanoes of Hawaii photo gallery [More info]
Images of Hawaiian volcanoes and the islands they've built in the past few million years, and images of recent eruptions.
Volcanoes of the United States [More info]
Booklet detailing plate tectonics, eruptions, hazards, and monitoring of U.S. volcanoes with black and white photos.
Volunteer Program of the Hawaiian Volcano Observatory (HVO) [More info]
Site for the Volunteer Program at the Hawaiian Volcano Observatory (HVO) with information on how to become a volunteer, volunteer housing, examples of volunteer experiences, available volunteer projects, and about HVO.
Yellowstone Volcano Observatory (YVO) [More info]
Homepage of the Yellowstone Volcano Observatory with links to information about the observatory at Yellowstone National Park, volcanic history, photo gallery, monitoring data, publications and products, and Frequently Asked Questions (FAQs).
30 cool facts about Mount St. Helens [More info]
Poster commemorating the 30th anniversary of the 1980 eruptions of Mount St. Helens, a volcano in southwestern Washington state. Facts provided in plain text as well.
PDF Boiling water at Hot Creek - The dangerous and dynamic thermal springs in California's Long Valley Caldera [More info]
Explains how these hot surface waters form, why their temperature changes often, and provides safety guidance for visiting this area.
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.
Carbon dioxide and helium discharge from Mammoth Mountain, Long Valley caldera, California [More info]
An explanation of toxic carbon dioxide emissions at Mammoth Mountain in Long Valley caldera, and a description of magmatic helium discharge at the Mammoth Mountain fumarole with photos, maps, and links to other studies.
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.
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