Scientists confirm 160-meter asteroid triggered 330-foot tsunami in North Sea 46 million years ago

Beneath the North Sea, seven hundred meters down on the seafloor, lies a scar that geologists have been arguing about for more than twenty years. The Silverpit Crater, discovered in 2002 roughly eighty miles off the Yorkshire coast, is a three-kilometer-wide depression surrounded by a much larger ring of circular faults that extend about twenty kilometers outward. For two decades, scientists could not agree on what made it. Some believed an asteroid had struck at tremendous speed. Others insisted underground salt had shifted, or that volcanic collapse had formed the structure. The disagreement grew so heated that in 2009, geologists formally voted on the crater's origin. Most of them rejected the impact explanation.

Now, new evidence has overturned that vote. A research team led by Dr. Uisdean Nicholson at Heriot-Watt University in Edinburgh has confirmed what many suspected: an asteroid roughly 160 meters wide struck the seabed between 43 and 46 million years ago. The finding, published in Nature Communications and funded by the Natural Environment Research Council, resolves one of geology's stubborn mysteries by combining three lines of evidence—advanced seismic imaging that revealed the crater's internal structure in unprecedented detail, microscopic analysis of rock samples from an oil exploration well nearby, and computer simulations that matched the observed crater to the predicted effects of an impact.

The smoking gun came from the rocks themselves. Scientists discovered shocked quartz and feldspar crystals in samples taken from the crater floor—minerals whose microscopic structure can only form under the extreme pressures of an asteroid collision, pressures far beyond anything normal geological activity produces. Finding these crystals was, as Dr. Nicholson described it, a needle-in-a-haystack effort. Their presence proved the impact hypothesis beyond reasonable doubt.

The asteroid approached from the west at a shallow angle and struck with devastating force. Within minutes of impact, the collision excavated the crater while hurling enormous volumes of rock, sediment, and seawater into the atmosphere. The impact created what Dr. Nicholson called a 1.5-kilometer-high curtain of rock and water that then collapsed back into the sea, generating a tsunami more than 100 meters tall—taller than most modern skyscrapers, towering more than 330 feet above sea level. The energy released was extraordinary, yet the asteroid itself was relatively modest in size compared to the space rock that killed the dinosaurs 66 million years ago.

Professor Gareth Collins of Imperial College London, who had attended the 2009 debate and developed the numerical models used in this new study, expressed relief at the resolution. He had always believed the impact hypothesis was the simplest and most consistent explanation. "It is very rewarding to have finally found the silver bullet," he said, noting that the new data now opens the door to deeper study of how impacts shape planetary surfaces—knowledge that is difficult to gather from other worlds.

Silverpit now joins a small and exclusive club. Across Earth's entire history, countless asteroids and comets have struck the planet, yet surprisingly few impact craters remain visible today. Erosion, weathering, volcanic activity, and the slow grinding of tectonic plates erase most traces of ancient impacts over millions of years. Roughly 200 confirmed impact craters exist on land. Beneath the oceans, only about 33 have been identified. Silverpit is one of them, and one of the best preserved. It sits alongside famous impact sites like Mexico's Chicxulub Crater, linked to the extinction of the nonavian dinosaurs, and the Nadir Crater off West Africa, another underwater impact site confirmed only recently. With the debate finally settled, scientists can now use Silverpit as a natural laboratory to understand how asteroid impacts have shaped Earth throughout its history—and what might happen should another asteroid find its way to our planet.