Information was needed on the fragmentation of trees and automobiles in the 10- to 50-psi peak overpressure range of a high-explosive test, as part of a program to evaluate the hazards of these debris sources near certain blast- hardened facilities. Toward this objective, full-size trees and automobiles were exposed at Event Dial Pack, a test operation where a 500-ton TNT surface charge was detonated. Three spruce and three aspen trees were subjected to this blast at both the 15- and 50-psi overpressure locations, and four automobiles were placed at each of the 15-, 30-, and 50-psi positions, with another stationed at 10 psi.
