Skip to main content

Research Repository

Advanced Search

Late Holocene paleoseismology of Shuyak Island, Alaska

Shennan, Ian; Brader, Martin D.; Barlow, Natasha L.M.; Davies, Frank P.; Longley, Chris; Tunstall, Neil

Late Holocene paleoseismology of Shuyak Island, Alaska Thumbnail


Ian Shennan

Natasha L.M. Barlow

Frank P. Davies

Chris Longley

Mr Neil Tunstall
Senior Geotechnical Experimental Officer


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.


Shennan, I., Brader, M. D., Barlow, N. L., Davies, F. P., Longley, C., & Tunstall, N. (2018). Late Holocene paleoseismology of Shuyak Island, Alaska. Quaternary Science Reviews, 201, 380-395.

Journal Article Type Article
Acceptance Date Oct 19, 2018
Online Publication Date Oct 29, 2018
Publication Date Dec 1, 2018
Deposit Date Oct 12, 2018
Publicly Available Date Oct 30, 2018
Journal Quaternary Science Reviews
Print ISSN 0277-3791
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 201
Pages 380-395


You might also like

Downloadable Citations