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-Hudiks
vall area is represented by intensive postglacial fracturing of the bedrock
recorded over an area of at least, 50 x 50 km. The most remarkable localit
y 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. Liquefac
tion 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 (C) 2000 Elsevier Science Ltd. All rights reserved.