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Earthquake Hazards on the Cascadia Subduction Zone

Heaton, Thomas H. and Hartzell, Stephen H. (1987) Earthquake Hazards on the Cascadia Subduction Zone. Science, 236 (4798). pp. 162-168. ISSN 0036-8075. doi:10.1126/science.236.4798.162.

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Large subduction earthquakes on the Cascadia subduction zone pose a potential seismic hazard. Very young oceanic lithosphere (10 million years old) is being subducted beneath North America at a rate of approximately 4 centimeters per year. The Cascadia subduction zone shares many characteristics with subduction zones in southern Chile, southwestern Japan, and Colombia, where comparably young oceanic lithosphere is also subducting. Very large subduction earthquakes, ranging in energy magnitude (M_w) between 8 and 9.5, have occurred along these other subduction zones. If the Cascadia subduction zone is also storing elastic energy, a sequence of several great earthquakes (M_w 8) or a giant earthquake (M_w 9) would be necessary to fill this 1200-kilometer gap. The nature of strong ground motions recorded during subduction earthquakes of Mw less than 8.2 is discussed. Strong ground motions from even larger earthquakes (M_w up to 9.5) are estimated by simple simulations. If large subduction earthquakes occur in the Pacific Northwest, relatively strong shaking can be expected over a large region. Such earthquakes may also be accompanied by large local tsunamis.

Item Type:Article
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Heaton, Thomas H.0000-0003-3363-2197
Additional Information:© 1987 American Association for the Advancement of Science. Published April 10, 1987. We particularly thank H. Kanamori for his patience and insight. We also thank W. Thatcher, J. Savage, B. Atwater, and anonymous reviewers for their comments on the manuscript.
Issue or Number:4798
Record Number:CaltechAUTHORS:20121212-095209080
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Official Citation:Earthquake Hazards on the Cascadia Subduction Zone Thomas H. Heaton and Stephen H. Hartzell Science , New Series, Vol. 236, No. 4798 (Apr. 10, 1987), pp. 162-168
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35937
Deposited By: Tony Diaz
Deposited On:02 Feb 2013 00:28
Last Modified:09 Nov 2021 23:18

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