Examines the occurrence of time-space clusters in U.S. national mortality data on adolescent suicide from 1978-84. Analysis indicated that overall significant time-space clustering occurred among 15-19 year olds. The authors believe they have documented for the first time that outbreaks of suicide occur more frequently than expected by chance alone. The occurrence of clusters varied by state & year of investigation & it appears that there has been an increase in teenage clusters in recent years.