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USGS Volcano-Warning Scheme for the United States
"USGS Alert Notification System for Volcanic Activity" 
The United States and its territories have about 170 volcanoes that have been active during the past 10,000 years, and most could erupt again in the future. In the past 500 years, 80 U.S. volcanoes have erupted one or more times. About 50 of these recently active volcanoes are monitored, although not all to the same degree. Through its five volcano observatories, the U.S. Geological Survey (USGS) issues information and warnings to the public about volcanic activity. For clarity of warnings during volcanic crises, the USGS has now standardized the alert-notification system used at its observatories. For MORE information see our four-page FACT SHEET online by Cynthia Gardner and Marianne Guffanti, explaining the USGS's new Volcano Alert Notification System for volcano activity. [Link to: Report] |
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