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BIRPS - DRUM -Flack & Warner 1990 interpretation Interpretation

VSA Author: Estelle Mortimer
Date Created: 2008-02-05

In this interpretation (after Flack and Warner, 1990) the presence of Mesozoic basins in and normal faults in the upper the presence of Mesozoic basins in and normal faults in the upper 5 seconds of the DRUM profile are clearly identified. Permian and older sediments (possibly to Torridonian) could account for reflections down to 4 seconds in the basins – particularly in the North Lewis Basin. The Flannan reflection is one of the most continuous, high-amplitude intra-mantle reflections imaged world-wide. It is believed to be a shear zone within the mantle (Smythe et al., 1982). The W-reflection is a P-wave reflector from within the mantle (Flack and Warner, 1990). Flack and Warner (1990) suggest that the W reflector could represent the Moho as it existed at the end of the Caledonian orogen.


  • Interpretation Administrator:
    • Rob Butler
  • VSA Author:
    • Estelle Mortimer

Geological Interpretation

Deformation Structures
Normal Faults, Thrusts

Age of Strata

Age of Deformation
Permian, Mesozoic

Geological Context

Plate Settings and Margins


Basin Setting
Passive Margin

Geographic Context

Physical Geography

Political Geography
United Kingdom of Great Britain & Northern Ireland