A volcano on Alaska’s Aleutian Islands has erupted, sending ash 20,000 feet into the air.
The U.S. Geological Survey says the Pavlof Volcano, which is about 600 miles southwest of Anchorage, erupted Sunday at 4:18 p.m. local time.
The agency said that the eruption also led to tremors on the ground.
A volcano alert warning remained in effect early Monday morning, and the aviation warning color code remains red, its highest level.
The volcano, which is about 4.4 miles in diameter, has had 40 known eruptions and “is one of the most consistently active volcanoes in the Aleutian arc.”
The volcano is “a largely snow-covered, cone-shaped mountain” that contains a caldera, which is a large volcanic crater.
The Alaska Volcano Observatory has issued a “red” aviation alert and a warning for the Pavlof Volcano due to the new activitity.