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 .
Increase in seismic activity noted at Mount Redoubt in southern Alaska . Alert level raised ; `` eruption within days to weeks '' is possible , officials say . Volcano last erupted in December 1989 and last for months . Mount Redoubt is about 100 southwest of Anchorage , Alaska .