Great tsunamigenic earthquakes during the past 1000 years in the Alaska megathrust

Shennan, Ian, Barlow, Natasha, Carver, Gary, Davies, Frank, Garrett, Ed and Hocking, Emma (2014) Great tsunamigenic earthquakes during the past 1000 years in the Alaska megathrust. Geology, 42 (8). pp. 687-690. ISSN 1943-2682

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Official URL: http://dx.doi.org/10.1130/G35797.1

Abstract

Large to great earthquakes and related tsunamis generated on the Alaska megathrust produce major hazards for both the area of rupture and heavily populated coastlines around much of the Pacific Ocean. Recent modeling studies suggest that single-segment ruptures,as well as multi-segment, 1964-type ruptures, can produce great earthquakes, >M8, and significant hazards both in the near field and to distant locations through the generation of tsunamis. We present new paleoseismological data from Kodiak Island and a new analysis of radiocarbon data based on Bayesian age modeling to combine our observations with previous geological, historical, and archaeological investigations. We suggest that, in addition to multi-segment ruptures in A.D. 1964 and 1020–1150 (95% age estimate), a single-segment
rupture occurred in 1788, with coseismic land-surface deformation across Kodiak Island and a tsunami that is recorded in historical documents and in sediment sequences, and another, similar rupture of the same Kodiak segment at A.D. 1440–1620. These indicate shorter intervals between ruptures of the Kodiak segment than previously assumed, and more frequent ruptures than for the Prince William Sound segment.

Item Type: Article
Additional Information: Article first published online: 9 June 2014
Subjects: F600 Geology
F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography
Related URLs:
Depositing User: Emma Hocking
Date Deposited: 26 Jun 2014 15:16
Last Modified: 10 Aug 2015 11:04
URI: http://nrl.northumbria.ac.uk/id/eprint/16718

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