AVO Puts Volcano Near Adak Back on Watch

A composite view of Semisopochnoi in January. (Courtesy: Dave Schneider/AVO)
A composite view of Semisopochnoi in January. (Courtesy: Dave Schneider/AVO)

A volcanic island in the Western Aleutians is stirring again, after several months of quiet.

Semisopochnoi was put on an advisory alert level on Wednesday morning. It’s the first alert at the volcano since a seismic flare-up last June, which was its first activity in almost 30 years.

The Alaska Volcano Observatory says earthquake activity began at Semisopochnoi in January, and increased over the past few days. They also report new seismic tremors they say could indicate magma moving inside the volcano.

Semisopochnoi is about 130 miles west of Adak. It comprises several craters and cones within one large caldera, where the last major eruption was in 1987.