Increase in seismic activity seen at Mount Redoubt in southern Alaska . Alert ##s raised ; ` ` eruption within days to weeks '' is possible , some say . Volcano last erupted in December 1989 and last for months . Bill Burton , a geologist with the U.S. Geological Survey , said since January there have been increases in seismic activity at Mount Redoubt followed by periods of quiet . Mount Hood is about 100 miles of Anchorage , Alaska .
Increase in seismic activity seen at Mount Redoubt in southern Alaska . Alert ##s raised ; ` ` eruption within days to weeks '' is possible , some say . Volcano last erupted in December 1989 and last for months . Mount Hood is about 100 miles of Anchorage , Alaska .