ASTER View of Mt. Usu, Japan
ASTER Instrument Team, ASTER Project,
One of our major goals is monitoring dynamic events. On March 31, Mt, Usu, Japan erupted, forcing the evacuation of 15,000 people. On April 3, ASTER captured this visible-to-infrared image. Lake Toya, the large lake, occupies an old volcanic caldera. The currently active Mt. Usu lies on the south shore. The 3 dark streaks starting on the northwest flank of the volcano are the ash deposits from the plume 3 days earlier. We are currently imaging Usu every 3 to 4 days, looking for further signs of unrest, and map damage to the towns and countryside.