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Science 6 November 1998:
Vol. 282. no. 5391, p. 1005
DOI: 10.1126/science.282.5391.1005m
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This Week in Science

Assessing earthquake hazards often requires knowledge of the time and magnitude of several previous quakes. Large earthquakes typically recur hundreds of years apart or longer, but most historic records extend for at most a few centuries, so methods of dating early earthquake events are needed. Zreda and Noller 1097 show that bedrock fault scarps can be dated directly by examination of the accumulation of cosmogenic nuclides in the exposed rocks. Their study of the Hebgen Lake fault, Wyoming, shows that it ruptured in five large earthquakes since 24,000 years ago. The repeat time between events is irregular, that is, strain seems to be released in discrete intervals.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)