Massive Underwater avalanche lasted two days

SysEngineer writes: Scientists are reporting what they say is the longest sediment avalanche yet measured in action.
It occurred underwater off West Africa, in a deep canyon leading away from the mouth of the Congo River.
Something in excess of a cubic kilometer of sand and mud descended into the deep.
This colossal flow kept moving for two whole days and ran out for more than 1,100km across the floor of the Atlantic Ocean.

No asociated tsunami - fortunately

[RockDoctor]

Sometimes these mass movements can relocate seabed sediment fast enough to cause the sea above to produce a tsunami. The Storegga Slide [wikipedia.org] (of about 8200 years ago certainly made life very difficult for the inhabitants of so-called Doggerland, and may have literally wiped the coastal plain off the map. A comparable event today would probably wipe out London, Rotterdam, Amsterdam and much of the Netherlands, maybe Antwerp ... But that;s less likely now - until a new sediment pile is built up by the next glaciat