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Late Holocene paleoseismology of Shuyak Island, Alaska.

Shennan, Ian and Brader, Martin D. and Barlow, Natasha L.M. and Davies, Frank P. and Longley, Chris and Tunstall, Neil (2018) 'Late Holocene paleoseismology of Shuyak Island, Alaska.', Quaternary science reviews., 201 . pp. 380-395.

Abstract

We report stratigraphic evidence of land-level changes along the eastern portion of the Alaska-Aleutian megathrust. Four marshes on Shuyak Island record variable amounts of coseismic deformation during four pre-20th century earthquakes. We combine these data with paleoseismic evidence from across the Kodiak, Kenai and Prince William Sound segments of the megathrust. These indicate that in the last 2000 years, AD 1964 was the only one to rupture all three segments simultaneously and generate a Mw 9.2 earthquake. The Kodiak segment ruptured independently on four further occasions with magnitudes > Mw 8.0; in AD 1788 and c.400 (440–320) BP, and independently but around the times of great earthquakes in the Prince William Sound segment c.850 and c.1500 BP.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1016/j.quascirev.2018.10.028
Publisher statement:© 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Date accepted:19 October 2018
Date deposited:30 October 2018
Date of first online publication:29 October 2018
Date first made open access:30 October 2018

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