The ash fell on 41,699 square miles of territory, according to the regional branch of the Geophysical Survey of the Russian Academy of Sciences. Scientists described the fallout as the largest in nearly 60 years.

The town of Klyuchi, which is about 30 miles from the volcano, was covered in a 3-inch layer of dust. Residents posted videos showing the ash cloud plunging the area into darkness.

Kamchatka Governor Vladimir Solodov said there was no need for a mass evacuation, but added that some residents who have health problems could be temporarily evacuated.

Shiveluch has two parts, the 10,771-foot Old Shiveluch and the smaller and very active Young Shiveluch.

The Kamchatka Peninsula, which stretches out into the Pacific Ocean about 4,000 miles east of Moscow, is one of the world’s hottest areas of geothermal activity, with some 30 active volcanoes.