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Great tsunamigenic earthquakes during the past 1000 yr on the Alaska megathrust

2014; Geological Society of America; Volume: 42; Issue: 8 Linguagem: Inglês

10.1130/g35797.1

1943-2682

Ian Shennan, Natasha Barlow, George Washington Carver, F. G. Davies, Ed Garrett, Emma P. Hocking,

Geological and Geochemical Analysis

Research Article| August 01, 2014 Great tsunamigenic earthquakes during the past 1000 yr on the Alaska megathrust Ian Shennan; Ian Shennan * 1Sea Level Research Unit, Department of Geography, Durham University, Durham DH1 3LE, UK *E-mail: ian.shennan@durham.ac.uk. Search for other works by this author on: GSW Google Scholar Natasha Barlow; Natasha Barlow 1Sea Level Research Unit, Department of Geography, Durham University, Durham DH1 3LE, UK Search for other works by this author on: GSW Google Scholar Gary Carver; Gary Carver 2Carver Geologic Inc., Kodiak, Alaska 99615, USA Search for other works by this author on: GSW Google Scholar Frank Davies; Frank Davies 1Sea Level Research Unit, Department of Geography, Durham University, Durham DH1 3LE, UK Search for other works by this author on: GSW Google Scholar Ed Garrett; Ed Garrett 1Sea Level Research Unit, Department of Geography, Durham University, Durham DH1 3LE, UK Search for other works by this author on: GSW Google Scholar Emma Hocking Emma Hocking 3Northumbria University, School of the Built and Natural Environment, Ellison Building, Newcastle upon Tyne NE1 8ST, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Ian Shennan * 1Sea Level Research Unit, Department of Geography, Durham University, Durham DH1 3LE, UK Natasha Barlow 1Sea Level Research Unit, Department of Geography, Durham University, Durham DH1 3LE, UK Gary Carver 2Carver Geologic Inc., Kodiak, Alaska 99615, USA Frank Davies 1Sea Level Research Unit, Department of Geography, Durham University, Durham DH1 3LE, UK Ed Garrett 1Sea Level Research Unit, Department of Geography, Durham University, Durham DH1 3LE, UK Emma Hocking 3Northumbria University, School of the Built and Natural Environment, Ellison Building, Newcastle upon Tyne NE1 8ST, UK *E-mail: ian.shennan@durham.ac.uk. Publisher: Geological Society of America Received: 23 Apr 2014 Revision Received: 21 May 2014 Accepted: 26 May 2014 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2014 Geological Society of America Geology (2014) 42 (8): 687–690. https://doi.org/10.1130/G35797.1 Article history Received: 23 Apr 2014 Revision Received: 21 May 2014 Accepted: 26 May 2014 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Ian Shennan, Natasha Barlow, Gary Carver, Frank Davies, Ed Garrett, Emma Hocking; Great tsunamigenic earthquakes during the past 1000 yr on the Alaska megathrust. Geology 2014;; 42 (8): 687–690. doi: https://doi.org/10.1130/G35797.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.