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Trio of Volcanoes on Alert Status in Alaska June 21, 2013
Veniaminof Images
Top: Bob Murphy photographed a plume from Kveiaminof on June 13, 2013, as seen from Port Moller. Bottom: The volcano's cone can be seen close-up in 2006.
A third Alaskan volcano has shown signs of unrest, causing scientists to raise the alert level southwest of Anchorage.

The Alaska Earthquake Observatory said it had detected an increase in surface temperatures and tremors around Veniaminof volcano, on the Alaska Peninsula.

The volcano has erupted about a dozen times over the past 200 years, the the most significant eruptions occurring between 1993 and 1995. In 2008, it spit out several minor bursts of ash.

The latest activity comes just over a month after nearby Pavlof volcano awakened, joining Mount Cleveland volcano in spewing ash.

Photos: Alaska Volcano Observatory