Scientists discover proof that an asteroid hit the North Sea over 43 million years in the past

New knowledge ends longstanding controversy

The Silverpit Crater sits 700 metres under the seabed within the North Sea, round 80 miles off the coast of Yorkshire.

Since its discovery in 2002, the three-kilometre-wide crater, which is surrounded by a 20 km-wide zone of round faults, has been on the centre of a heated debate amongst geologists.

Initial research recommended it was an impression crater. The scientists who discovered it pointed to its central peak, round form and concentric faults, traits typically related to hypervelocity impacts.

However, various theories argued that the crater construction was brought on by salt shifting deep under the crater flooring or the collapse of the seabed due to volcanic exercise.

A 160-m large asteroid hit the North Sea

The new analysis workforce used newly accessible seismic imaging knowledge and proof from under the seabed to show the impression principle.

Dr Uisdean Nicholson, a sedimentologist in Heriot-Watt University’s School of Energy, Geoscience, Infrastructure and Society, mentioned: “New seismic imaging has given us an unprecedented have a look at the crater.

“Samples from an oil properly within the space additionally revealed uncommon ‘shocked’ quartz and feldspar crystals on the identical depth because the crater flooring.

“We were exceptionally lucky to find these – a real ‘needle-in-a-haystack’ effort. These prove the impact crater hypothesis beyond doubt, because they have a fabric that can only be created by extreme shock pressures.”

Dr Nicholson mentioned: “Our proof exhibits {that a} 160-metre-wide asteroid hit the seabed at a low angle from the west.

“Within minutes, it created a 1.5-kilometre high curtain of rock and water that then collapsed into the sea, creating a tsunami over 100 metres high.”

Professor Gareth Collins from Imperial College London was on the Silverpit Crater debate in 2009 and in addition supplied the numerical fashions for the brand new examine.

Professor Collins mentioned: “I all the time thought that the impression speculation was the best clarification and most in line with the observations.

“It is very rewarding to have finally found the silver bullet. We can now get on with the exciting job of using the amazing new data to learn more about how impacts shape planets below the surface, which is really hard to do on other planets. ”

The analysis was funded by the Natural Environment Research Council (NERC), full undertaking particulars are available online.