The Geological Society of America

Over one thousand years ago, a volcano erupted on the Yukon-Alaska border leaving behind White River Ash on a massive area of the region.  However, a recent study shows that the affected area may have been even larger. 

The eruption in question took place in 850 AD at Mount Churchill in southeastern Alaska.  The original theory was the ash produced by that eruption covered 1,000 kilometers, however, researchers have now found that the area is far more expansive.

NASA Goddard Space Flight Center

The ongoing eruption of the Pavlof Volcano on the Alaska Peninsula has gazers and scientists paying close attention, and now there are reports of activity at another Alaskan volcano. KDLG’s Luke Brummer has the details.

Volcano Screams Just Before Eruption

Jul 18, 2013
Cyrus Read / Alaska Volcano Observatory/USGS

Volcanic eruptions are visually spectacular.  Lava explodes into the air and giant plumes drop ash particles on nearby towns.  Scientists can also listen to volcanoes as they rumble and ultimately explode. Mount Redoubt’s 2009 eruption even allowed scientists to record a scream just before it erupted.  KDLG's Ben Matheson has the story.

Kristi Wallace / Alaska Volcano Observatory/USGS

All of Alaska’s currently active volcanoes are hundreds of miles from the scientists responsible for warningus of potentially hazardous activity or the likelihood of ash clouds that disrupt air traffic.  Satellite imagery and seismic sensors give researchers a look into what’s going on, but they depend heavily on citizen scientists for eyes and ears on the ground.  The Alaska Volcano Observatory aims to improve the quality of ash forecasts through a new online tool.

Alaska Volcano Observatory

Pavlof Volcano’s eruption has grounded flights into Cold Bay for the second day in a row.  Pen Air confirms that its planes did not make it into the Aleutian community as the ash cloud rose to 25 thousand feet.  The Alaska Volcano Observatory reports that the eruption has declined since yesterday and now consists of intermittent seismic tremor and explosions.

No ash fall was reported today [Wednesday] in King Cove, where trace amounts of ash fell Tuesday.  King Cove is located about 30 miles southwest of the volcano. 

Pavlof Volcano isn't showing signs of slowing down. It erupted all through the weekend, though not at levels that disturb international air traffic. But as KUCB's Lauren Rosenthal reports, the volcano's done enough to stop regional air service to western Alaska.


  The Alaska Volcano Observatory has raised the alert level for the active Cleveland Volcano in the east central Aleutian Islands.