Zoe Sobel/KUCB

After more than two dozen explosions, Bogoslof Volcano has finally dropped ash on Unalaska.

In its longest eruption since activity began six weeks ago, the volcano dusted the island with less than a millimeter of ash Monday night and produced a strong sulfurous smell.

The eruption lasted eight hours, starting at 8:20 p.m. with a series of explosions that eventually morphed into a continuous ash plume.

AVO / U.S. Geological Survey

One Aleutian volcano has erupted again, and another is showing signs of life.

Bogoslof Volcano erupted early Tuesday morning, continuing a series of explosions that date back to mid-December.

The Alaska Volcano Observatory (AVO) warned a trace amount of ash could fall on Unalaska, 60 miles to the east, but there have been no reports of it reaching the island.

Meanwhile, the AVO has increased the alert level for Takawangha Volcano, 60 miles west of Adak.

Vic Fisher

Bogoslof Volcano erupted again Wednesday, spewing a cloud of ash that was visible from Unalaska.

The volcano blew around 1:20 p.m., sending ash at least 31,000 feet into the air and prompting the Alaska Volcano Observatory to raise its alert level to red.

That’s the highest status, indicating a hazardous eruption is underway or imminent.

Bogoslof Volcano Erupts

Dec 20, 2016
T. Keith, U.S. Geological Survey

A volcano in the eastern Aleutians erupted suddenly Tuesday afternoon. The Alaska Volcano Observatory (AVO) says several pilots reported seeing an ash cloud about 34,000 feet above Bogoslof volcano.

Bogoslof volcano is on an uninhabited island 60 miles northwest of Unalaska.

U.S. Geological Survey vis Wikimedia Commons

An explosion at one of Alaska's most active volcanoes has led scientists to raise its alert level from "advisory" to "watch."

Cleveland Volcano is located on an uninhabited island in the central Aleutians. On Monday afternoon, the Alaska Volcano Observatory detected a short-lived explosion that was also heard by residents of Nikolski, 45 miles away.

Chris Waythomas is a geologist with the observatory, and he said this is common behavior for the often-restless volcano.