Brunel University Research Archive (BURA) >
University >
Publications >

Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/5510

Title: Sedimentary record of coseismic subsidence in Hersek coastal lagoon (Izmit Bay, Turkey) and the late Holocene activity of the North Anatolian Fault
Authors: Bertrand, S
Doner, L
On, SA
Sancar, U
Schudack, U
Mischke, S
Cagatay, MN
Leroy, SAG
Keywords: North Anatolian Fault
Coastal lagoon
Coseismic subsidence
Tsunami
Marmara sea region
Cascadia subduction zone
Large earthquakes
Great earthquakes
Slip distribution
Tsunami deposits
Vancouver-island
New-Zealand
West-Coast
August 17
Publication Date: 2011
Citation: Geochemistry Geophysics Geosystems 12: Q06002, Jun 2011
Abstract: The late Holocene activity of a restraining bend of the northern strand of the North Anatolian Fault in Izmit Bay was investigated by a sedimentological, geochemical, and paleoecological analysis of sediment cores from Hersek coastal lagoon, NW Turkey. The sediment cores show a succession of sedimentary sequences composed of three units separated by gradual transitions. The first unit is composed of a thin layer of shell debris-rich sediment in abrupt contact with the underlying organic-rich deposits. This unit is over-lain by a thick foraminifera-rich mud deposit, and the sequences are capped by an organic-rich mud unit. These sequences are interpreted as silting up, shallowing upward deposits, typical of a lagoon becoming isolated from the sea. We suggest that they represent the sedimentary signature of coseismic subsidence, which was caused by reverse slip at the Hersek bend, and tsunamis in Izmit Bay. Our radiocarbon-dated paleoseismological record indicates (1) the atypical collapse of the hanging wall during the 740 earthquake and (2) subsidence of the footwall during the 987, 1509, and 1719 earthquakes. This study contributes to the understanding of the dynamics of restraining bends, and it highlights the potential of coastal sediments for reconstructing past earthquakes and tsunamis in regions dominated by strike-slip deformations.
Description: This research was funded by the European Union in the framework of the REL.I.E.F. (Reliable Information on Earthquake Faulting) project (EVG1‐CT‐2002‐00069). Copyright @ 2011 American Geophysical Union.
Sponsorship: This article is available through the Brunel Open Access Publishing Fund
URI: http://bura.brunel.ac.uk/handle/2438/5510
DOI: http://dx.doi.org/10.1029/2011GC003511
ISSN: 1525-2027
Appears in Collections:Institute for the Environment Research Papers
Environment
Publications
Brunel OA Publishing Fund

Files in This Item:

File Description SizeFormat
Fulltext.pdf1.36 MBAdobe PDFView/Open

Items in BURA are protected by copyright, with all rights reserved, unless otherwise indicated.

 


Library (c) Brunel University.    Powered By: DSpace
Send us your
Feedback. Last Updated: September 14, 2010.
Managed by:
Hassan Bhuiyan