June 4, 2014 12:12 pm

Alaskan volcano eruption prompts alerts

An aerial view of the Pavlof Volcano in Alaska, taken on May 31.

Paul Horn, Alaska Fish and Game

TORONTO – One of Alaska’s most active volcanoes continues to erupt, prompting an aviation orange alert to be issued.

The alert, issued by the Alaska Volcano Observatory, was downgraded Tuesday evening from a red alert which indicates that an eruption is either imminent or underway “with significant emission of volcanic ash into the atmosphere,” according to the U.S. Geological Survey.

Gallery of Pavlof volcanic eruption

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The alert was downgraded by the observatory following decreased activity over the past 12 hours.

The ash plume from the volcano reached about seven kilometres above sea level and extends over 80 km southeast of the volcano.

Seismometers have detected tremors, water and sediment flows called lahars which are produced by the mixing of volcanic ash and snow and ice.

The volcano’s most recent eruption was in May and July of 2013. It has erupted more than 40 times since the early 1800s.

Location of the Pavlof Volcano

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