A major U.S. city is under threat from a potential volcanic eruption after more than 20 earthquakes were recorded in Alaska.

An explosion on Mount Spurr could generate massive cloud of ash, which could mess with airplanes and cause issues for humans.

Researchers found that a potential powerful earthquake combined with rising sea levels could lead to a mega tsunami.

The 11,000-foot-tall volcano lies roughly 80 miles from Alaska's most densely populated city, and its eruption could cause international chaos.

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Scientists at Mount Spurr in Alaska have been ... but authorities claim an eruption is less likely than previously projected. The 11,000-foot-tall active volcano Mount Spurr, about 80 miles ...

They concluded after analyzing 1,700 small quakes that while there's some activity beneath Uturuncu, the volcano is at low risk for eruption anytime ... hazardous': Alaska volcano could erupt ...

If an eruption happens, it would likely occur at Crater Peak, shown in the background of this summit photograph. Photograph by Matt Loewen, Alaska Volcano Observatory, U.S. Geological Survey ...