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Mauna Loa Volcano, HI - Mauna Loa is the Earth’s largest active volcano. Before 2022's event, Mauna Loa last erupted in 1984.

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Kilauea Volcano, HI -

Kilauea has been active since 1983. It has erupted several times in the last few years. In 2018, Kilauea experienced a particularly violent and destructive eruption that destroyed 700 homes and forced a mass evacuation.

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Mount Rainier Volcano, WA - The highest peak in the Cascade Range last erupted about 1,000 years ago.

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Mount Rainier Volcano, WA - However, there is an active thermal system under the volcano and it is considered to be a very high threat.

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Mount St. Helens, WA - This volcano most recently erupted from 2004-2008.

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Mount St. Helens, WA - It has experienced a series of earthquakes starting in January 2018, and is considered to be a very high threat.

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Mount Hood Volcano, OR - Oregon’s highest peak last erupted in 1865.

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Mount Hood Volcano, OR - The volcano has been quiet since then, but it is under watch by the USGS.

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South Sister Volcano, OR - The entire Three Sisters area is considered to have a high threat potential for eruptions.

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South Sister Volcano, OR - If the eruption doesn’t come from South Sister Volcano or the other sisters, it might come from the formation of a new volcano.

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Lassen Volcanic Cluster, CA - This volcanic area last experienced an eruption in 1917.

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Lassen Volcanic Cluster, CA - It has experienced some earthquakes since then, and could experience another volcanic eruption sometime soon.

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Mount Shasta Volcano, CA - This volcano last erupted 200-300 years ago.

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Mount Shasta Volcano, CA - Records indicate that the volcano erupts every 600-800 years, and it’s considered a very high threat.

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Redoubt Volcano, AK - This volcano last erupted in 2009, and is close to the city of Anchorage.

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Redoubt Volcano, AK - It is being carefully monitored and is not currently erupting.

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Crater Lake Volcano, OR - The Mount Mazama volcano last erupted 6,600 years ago, and the crater (now filled with water) known as Crater Lake was formed due to a collapse during an earlier eruption.

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Crater Lake Volcano, OR - Things have been quieter since the last eruption, but the USGS still thinks it’s worth keeping a very close eye on the area.

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Yellowstone Caldera, WY - The volcanic eruptions that formed Yellowstone’s calderas haven’t occurred for 70,000 years.

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Yellowstone Caldera, WY - If this massive volcano were to erupt, it could be catastrophic. The Yellowstone Volcano is sometimes called a supervolcano.

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Long Valley Caldera, CA - The volcano hasn’t erupted for at least 16,000 years, but has shown signs of unrest over the past few decades.

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Long Valley Caldera, CA - The USGS considers its threat potential very high and monitors the area very carefully.

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Newberry Volcano, OR - The largest volcano in the Cascades volcanic arc has not erupted for 1,300 years.

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Newberry Volcano, OR - However, the presence of hot springs and geologically recent lava flows make it quite clear this is still an active volcano that should be watched.

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Mount Akutan, AK - This Alaskan volcano was last active in 2014, and is being monitored.

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Makushin Volcano, AK - This Aleutian Volcano has erupted a number of times. It last erupted in 1995.

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Mount Cleveland, AK -

The volcano is one of the more active volcanoes in the Aleutian Arc.

See also: Big cities on the brink of natural disaster

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