Image: Redoubt volcano
AVO/USGS via AFP - Getty Images
Acloud of steam and ash from the Redoubt volcano on April 5, 2009 in Alaska. The last significant blast from Mount Redoubt began in December 1989.
updated 5/4/2009 11:41:26 AM ET 2009-05-04T15:41:26

Mount Redoubt is acting up with greater intensity.

It's rumbling and grumbling and producing a substantial ash and steam plume.

On Sunday, scientists said there was a marked increase of seismicity at the volcano about 100 miles southwest of Anchorage.

One plume went to 18,000 feet.

The volcano has been in what is called a dome-building phase as it grows a lava dome in its crater.

The dome has grown considerably in recent weeks. A tongue of lava now has advanced about 550 yards down the Drift Glacier Gorge.

The volcano had its last major explosion on April 4.

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