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The Most Dangerous Volcanoes in the United States


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There are 169 volcanoes in the United States. Eighteen of them have been designated as "Very High Threat Volcanoes" by the United States Geological Survey. These volcanoes have devasted large areas with volcanic blasts, invaded their surroundings with lava flows, produced large mudflows that have swept over hundreds of square miles, emitted noxious gases that have caused lung ailments and produced ash clouds that have brought down passenger jets and blanketed thousands of square miles. Each of these volcanoes is marked on the map below. Click on the markers to learn more about them or zoom in for a closer look. A list of these dangerous volcanoes and a link to the USGS report can be found below the map.


Volcanoes shown on the map above


Akutan Volcano:

  A stratovolcano in Alaska - Last eruption in 1992.

Augustine Volcano:

  A lava dome in Alaska - Current activity/unrest.

Makushin Volcano:

  A stratovolcano in Alaska - Last eruption in 1995.

Redoubt Volcano:

  A stratovolcano in Alaska - Last eruption in 1990.

Spurr Volcano:

  A stratovolcano in Alaska - Last eruption in 1992.

Lassen Peak:

  A stratovolcano in California - Last eruption in 1917.

Long Valley:

  A caldera in California - Last eruption during the Pleistocene.

Mount Shasta:

  A stratovolcano in California - Last eruption in 1786.

Kilauea Volcano:

  A shield volcano in Hawaii - Current activity/unrest.

Mauna Loa Volcano:

  A shield volcano in Hawaii - Last eruption in 1984.

Crater Lake:

  A caldera in Oregon - Last eruption about 2290 BC +/- 300 years.

Mount Hood:

  A stratovolcano in Oregon - Last eruption in 1866.

Newberry Volcano:

  A shield volcano in Oregon - Last eruption about 620 AD.

South Sister:

  A stratovolcano in Oregon - Last eruption about 50 BC (?).

Mount Baker Volcano:

  A stratovolcano in Washington - Last eruption in 1880.

Glacier Peak:

  A stratovolcano in Washington - Last eruption about 1700.

Mount Rainier:

  A stratovolcano in Washington - Last eruption in 1825.

Mount St. Helens:

  A stratovolcano in Washington - Current activity/unrest.

Learn more about the USGS Volcanic Threat Assessment

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Mount Vesuvius pictures and information Mount Vesuvius
Igneous rocks Igneous Rocks
Volcanic ash Volcanic Ash

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