WASHINGTON — Dr. Alexander Garza, associate dean at St. Louis University’s College of Public Health and Social Justice, will be ...
(U.S. Geological Survey)
April 6, 2010
The eruption of May 18, 1980 sent volcanic ash, steam, water and debris to a height of 60,000 feet. The mountain lost 1,300 feet of altitude and about 2/3 of a cubic mile of material stream downward from the center of the plume and the formation and movement of pyroclastic flows down the left flank of the volcano.