(AP) -- Alaska's Mount Redoubt has erupted again, spewing an ash cloud 50,000 feet up into the air.
The Alaska Volcano Observatory in Anchorage says the volcano had a significant eruption at 1:20 a.m. Saturday. The ash is expected to move north toward the Alaska Range, missing Anchorage which is about 100 miles from the volcano.
The observatory says after the eruption, it detected strong seismic activity lasting 20 minutes or more followed by an hours-long low-level tremor.
Since the series of eruptions began Sunday night, the volcano has had about a dozen bursts. The last time the volcano erupted was during a four-month period in 1989-90.
©2009 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
Explore further: Study shows air temperature influenced African glacial movements