Late Holocene paleoseismology of Shuyak Island, Alaska.

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 th...

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Bibliographic Details
Published in:Quaternary Science Reviews
Main Authors: Shennan, Ian, Brader, Martin D., Barlow, Natasha L.M., Davies, Frank P., Longley, Chris, Tunstall, Neil
Format: Article in Journal/Newspaper
Language:unknown
Published: Elsevier 2018
Subjects:
Kodiak
Alaska
Online Access:http://dro.dur.ac.uk/26643/
http://dro.dur.ac.uk/26643/1/26643.pdf
https://doi.org/10.1016/j.quascirev.2018.10.028
Description
Summary: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.

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