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Great earthquakes of variable magnitude at the Cascadia subduction zone

Published online by Cambridge University Press:  20 January 2017

Alan R. Nelson*
Affiliation:
Geologic Hazards Team, U.S. Geological Survey, MS 966, PO Box 25046, Denver, CO 80225, USA
Harvey M. Kelsey
Affiliation:
Department of Geology, Humboldt State University, Arcata, CA 95521, USA
Robert C. Witter
Affiliation:
Oregon Department of Geology and Mineral Industries, Coastal Field Office, 313 SW 2nd St., Suite D, Newport, OR 97365, USA
*
*Corresponding author. E-mail address:[email protected] (A.R. Nelson).

Abstract

Comparison of histories of great earthquakes and accompanying tsunamis at eight coastal sites suggests plate-boundary ruptures of varying length, implying great earthquakes of variable magnitude at the Cascadia subduction zone. Inference of rupture length relies on degree of overlap on radiocarbon age ranges for earthquakes and tsunamis, and relative amounts of coseismic subsidence and heights of tsunamis. Written records of a tsunami in Japan provide the most conclusive evidence for rupture of much of the plate boundary during the earthquake of 26 January 1700. Cascadia stratigraphic evidence dating from about 1600 cal yr B.P., similar to that for the 1700 earthquake, implies a similarly long rupture with substantial subsidence and a high tsunami. Correlations are consistent with other long ruptures about 1350 cal yr B.P., 2500 cal yr B.P., 3400 cal yr B.P., 3800 cal yr B.P., 4400 cal yr B.P., and 4900 cal yr B.P. A rupture about 700–1100 cal yr B.P. was limited to the northern and central parts of the subduction zone, and a northern rupture about 2900 cal yr B.P. may have been similarly limited. Times of probable short ruptures in southern Cascadia include about 1100 cal yr B.P., 1700 cal yr B.P., 3200 cal yr B.P., 4200 cal yr B.P., 4600 cal yr B.P., and 4700 cal yr B.P. Rupture patterns suggest that the plate boundary in northern Cascadia usually breaks in long ruptures during the greatest earthquakes. Ruptures in southernmost Cascadia vary in length and recurrence intervals more than ruptures in northern Cascadia.

Type
Research Article
Copyright
University of Washington

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