Reports

Rupture Zones of Great Earthquakes in the Alaska-Aleutian Arc, 1784 to 1980

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Science  19 Dec 1980:
Vol. 210, Issue 4476, pp. 1343-1345
DOI: 10.1126/science.210.4476.1343

Abstract

Historical documents indicate that great earthquakes ruptured at least a 500-kilometer-long segment of the plate boundary near the Alaska Peninsula in 1788 and 1847. At least half of a major seismic gap in the Shumagin Islands ruptured during those shocks but has not experienced a great earthquake for at least 77 years. Large shocks along this and other plate boundaries occur in bursts followed by several decades during which there is very little energy release.