Mud and sand from Kaikōura and Cook Strait canyons are carried by fast, muddy flows called turbidity currents. Most turbidity currents spill out of a gap 1,400 kilometres along the channel, where the current known as the Ocean Conveyor spreads the sediment into a fan. Some currents continue up to 600 kilometres further across the deep ocean floor.
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Source: NIWA – National Institute of Water and Atmospheric Research
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