The first contained everything within a range of 10 kilometers from the summit, the second 10-20 kilometers, and the last one 20-40 kilometers. Evacuation of the first zone started on April 7th, the second on June 7th, and the last one on June 13th. The effort put into evacuating people from the blast area saved hundreds of thousands of lives and is considered one of the most successful hazard mitigation efforts.
