Abstract
On the continental shelf off Mid Norway at water depths ranging from 150 to 350 m, large areas of the seabed consist of plastic clays with a rugged surface topography and an amorphous (opaque) subsurface acoustic appearance. Five topographic (side-scan sonar) and shallow seismic examples are presented and discussed. Many of the mounds and ridges are suspected to be of a clay diapiric nature. Numerous gas seepages originating from opaque clays have also been found off Mid Norway. A tentative formation model for the ridges and dome-shaped features is proposed. The model is based on suspected differential gas charging of subsurface sediments and clay diapirism caused by differential clay buoyancy.
Published Version
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