It is unclear how the holes were formed, although marine trash could partly be responsible.
For their latest survey, the Lundsten and colleagues wanted to investigate this pockmark field because there are proposals to build a wind-energy farm in the area.
Pockmarks have been found in other locations around the world and scientists have linked them to the release of methane gas or other fluids from the seafloor. The release of the these gases could make the seafloor unstable, which has implications for the construction of offshore infrastructure. The micro depressions, on the other hand, formed more recently, although, again, it is unclear how. Nevertheless, the team found several clues that could provide a potential explanation. Many of the MDs contained exotic objects, including rocks, animal bones and bits of kelp. Meanwhile, others contained different kinds of marine trash, such as fishing gear and plastic debris.
Nevertheless, Lundsten said that much more research is needed to fully understand how the micro depressions and pockmarks were formed.
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