GLOBAL VOLCANISM: Increased Seismic Activity Reported At Aleutian Island’s Semisopochnoi Volcano – USGS Upgrades Alert Level To "Advisory"!

Semisopochnoi Island, in November 2012. | Roger Clifford


March 26, 2015 – ALEUTIAN ISLANDS, ALASKA
– Citing increased seismic intensity, the U.S. Geological Survey is upgrading the volcano alert level status for Semisopochnoi, an Aleutian Island volcano, to “advisory,” the agency said in a notice issued Wednesday morning.

Seismic activity at the Semisopochnoi volcano began in January, but “has increased in intensity over the past few days,” USGS wrote in the notice.

“In addition, we have detected brief periods of seismic tremor, which can indicate movement of magma or magmatic gases.”

Semisopochnoi is remote even by Alaska standards. It lies on an island of the same name some 127 miles from Adak and 1,283 miles from Anchorage.

The volcano last erupted in 1987.  – Alaska Dispatch News.


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