HR: 1340h
AN: OS23B-1305    [Abstracts]
TI: Reconstruction of the pre-slide stratigraphy in the Storegga Slide scar, mid-Norwegian shelf
AU: * Forsberg, C
EM: cff@ngi.no
AF: Norwegian Geoechnical Institute, P.O.Box 3930 Ullevaal Stadion, Oslo, N-0806 Norway
AU: Berg, K
EM: kjell.berg@hydro.com
AF: Norsk Hydro ASA, Oslo, Oslo, N-0246 Norway
AB: As a contribution to understanding the giant Storegga Slide a reconstruction of the pre-slide stratigraphy has been performed. The isopachs between six interpreted seismic horizons from an extensive set of commercial 2D-seismic sections were interpolated to "rebuild" the pre-slide stratigraphy. The reconstructed surfaces indicate that a total of about 3500 km3 of sediment was removed from the main slide area. An additional 440 km3 of slide masses rests on top of slide slip surface in the NE part of the slide scar. There are also other regions where slide masses remain or where they have only been slightly displaced including an approx. 30 km x 80 km region of compression. The level of the reconstructed sea floor compares well with the thickness of eroded sediments calculated from geotechnical measurements.
DE: 9325 Atlantic Ocean
DE: 9604 Cenozoic
DE: 3022 Marine sediments--processes and transport
DE: 3025 Marine seismics (0935)
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting