Deglacial paleoseismicity in Sweden:the 9663 BP Iggesund event

• Published in: Quaternary Science Reviews
• Main Authors: Mörner, Nils-Axel, Tröften, Per Einar, Sjöberg, Rabbe, Grant, Douglas, Dawson, Sue, Bronge, Christian, Kvamsdal, Ole, Sideén, Alf
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2000
• Subjects: /dk/atira/pure/subjectarea/asjc/2300/2306; name=Global and Planetary Change; /dk/atira/pure/subjectarea/asjc/1100/1105; name=Ecology; Evolution; Behavior and Systematics; /dk/atira/pure/subjectarea/asjc/1200/1204; name=Archaeology; /dk/atira/pure/subjectarea/asjc/3300/3302; /dk/atira/pure/subjectarea/asjc/1900/1907; name=Geology; Boda; Fennoscandia
• Online Access: https://discovery.dundee.ac.uk/en/publications/0babd54c-eee3-46d1-a919-b9b2919c3e4f; https://doi.org/10.1016/S0277-3791(00)00095-0; http://www.scopus.com/inward/record.url?scp=0033810054&partnerID=8YFLogxK

The Iggeesund event is an example of the high seismicity which occurred in Fennoscandia during deglaciation as a function of the high rate of glacial isostatic uplift. This event is dated to varve 9663 BP. The Iggesund-Hudiksvall area is represented by intensive postglacial fracturing of the bedrock recorded over an area of at least, 50 x 50 km. The most remarkable locality is the Boda cave system; a hill fractured into a field of large detached blocks with a cave system of more than 2 km length. In the varve-year 9663 BP, an extensive turbidite was spread over an area of 210 x 80 km. Liquefaction structures are recorded over an area of 80 x 30 km and can be assigned to the same varve year. Structures and deposits of a tsunami are recorded over 80 x 50 km.