Science, Space and Technology News 2024
3D image of a giant underwater avalanche that took place nearly 60,000 years ago in the Agadir Canyon. Credit: Dr. Christoph Bottner, Aarhus University
Researchers at the University of Liverpool have traced the path of a massive underwater avalanche that expanded over 100 times its initial size while wreaking havoc along the Atlantic seabed. This landmark study provides detailed insights into the dynamics and scale of such avalanches, emphasizing their potential threat to crucial underwater infrastructure like internet cables.
The research team analyzed more than 300 core samples from the area taken during research cruises over the last 40 years. This, alongside seismic and bathymetry data, enabled them to map out the giant avalanche.Dr. Stevenson said: “This is the first time anyone has managed to map out an entire individual underwater avalanche of this size and calculate its growth factor.”
“To put it in perspective: that’s an avalanche the size of a skyscraper, moving at more than 40 mph from Liverpool to London, which digs out a trench 30 m deep and 15 km wide destroying everything in its path. Then it spreads across an area larger than the UK burying it under about a metre of sand and mud.”in Denmark, who co-led the team, said “We calculate the growth factor to be at least 100, which is much larger compared to snow avalanches or debris flows which only grow by about 4-8 times.
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