On August 2, 2007, at 3:21 am UTC (August 1 at 7:21 pm ADT), a strong earthquake, magnitude 6.7, occurred in the Andreanof Islands region of the Aleutian Islands. This earthquake is the largest to occur in the region since the M6.6 event on July 8, 2006

The mainshock occurred in the area separating the rupture zones of the 1965 M8.7 Rat Islands earthquake to the west and the 1957 M8.6 Andreanof Islands earthquake to the east.