Dating early Holocene palaeoseismic event(s) in the Gulf of Bothnia, Baltic Sea

Deformation structures in submarine Holocene sediments caused by palaeoseismicity have recently been found in the Olkiluoto area, Gulf of Bothnia, Baltic Sea, within old fracture zones of bedrock. In this study, the palaeoseismic event(s) was dated and the palaeoenvironment was characterized using p...

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Bibliographic Details
Published in:Boreas 2007, Vol.36 (1), p.56-64
Main Authors: Hutri, Kaisa-Leena, Heinsalu, Atko, Kotilainen, Aarno, Ojala, Antti
Format: Article
Language:English
Subjects:
Brackish
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Summary:Deformation structures in submarine Holocene sediments caused by palaeoseismicity have recently been found in the Olkiluoto area, Gulf of Bothnia, Baltic Sea, within old fracture zones of bedrock. In this study, the palaeoseismic event(s) was dated and the palaeoenvironment was characterized using palaeomagnetic, biostratigraphical and lithostratigraphical methods, thereby enhancing the reliability of the chronology. The variations in the inclination and declination of the Olkiluoto sediment core showed very good correlation with the palaeosecular variations recorded in the annually laminated long lake sediment record from Lake Nautajaervi in central Finland. Combined litho-, bio- and palaeomagnetic stratigraphy revealed an age estimation of 10 650 to 10 200 cal. yr BP for the palaeoseismic event(s), which coincides with postglacial bedrock faulting in northern Fennoscandia.
ISSN:0300-9483
DOI:10.1080/03009480600827314