Prehistoric rock avalanches in the Olympic Mountains, Washington
Science
By: R. L. Schuster, R.L. Logan, and P. T. Pringle
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Abstract
Rock avalanches blocked streams in the Olympic Mountains southwest of Puget Sound during the past few thousand years. Limiting radiocarbon ages indicated that three or four of six avalanches occurred from 1000 to 1300 years ago or shortly thereafter. Most of the dates were from the outer preserved rings of trees drowned behind avalanche dams. These three or four avalanches may be coeval not only with one another but also with abrupt tectonic deformation in western Washington. No rock avalanches in the Olympic Mountains are known to have resulted from storms or earthquakes during the past century. The avalanches strengthen the case that a large prehistoric earthquake occurred in the Puget Sound region.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Prehistoric rock avalanches in the Olympic Mountains, Washington |
| Series title | Science |
| Volume | 258 |
| Issue | 5088 |
| Year Published | 1992 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Science |
| First page | 1620 |
| Last page | 1621 |
| Google Analytic Metrics | Metrics page |