Cascade Volcanoes

Volcanoes monitored by the Cascade Volcano Observatory and the latest updates made to the volcanic threat assessment in 2018.

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Volcanic Threat

Volcanic Hazards

Volcanoes may threaten the United States with earthquakes, landslides, floods, tsunamies, volcanic gas, ash falls, and wildfires, etc. To manage the large number of volcanoes within the country, the responsibility has been divided between five regional observatiories. This page provides an introduction to the volcanoes monitored by the Cascades Volcano Observatory. Volcanic threat is scored using a detailed rubric of hazard and exposure factors based on volcano type, modern observations, and historical activity.


Mount St. Helens, 1980


These images of the destruction from Mount St. Helens were presented in the 2018 Volcanic Threat Assesment Update, courtesy of various USGS members.

A Closer Look

Elevation, compostion, and volcano type are variable. Colors summarize compositional differences, but try hovering for further detail.

Ewert, J.W., Diefenbach, A.K., and Ramsey, D.W., 2018, 2018 update to the U.S. Geological Survey national volcanic threat assessment: U.S. Geological Survey Scientific Investigations Report 2018–5140, 40 p., https://doi.org/10.3133/ sir20185140.

volcanoes.usgs.gov