New research has resolved a long-standing debate, confirming that the Silverpit Crater beneath the North Sea resulted from an asteroid strike about 43 to 46 million years ago. The impact generated a tsunami over 100 meters high. Led by Dr. Uisdean Nicholson of Heriot-Watt University, the study used seismic imaging and shocked minerals to provide definitive evidence.
The Silverpit Crater, located about 700 meters beneath the seabed in the southern North Sea and roughly 80 miles off the coast of Yorkshire, measures three kilometers wide with a surrounding ring of circular faults spanning about 20 kilometers. First identified by geologists in 2002, the structure sparked intense debate over its origins. Early proposals suggested a high-speed asteroid impact due to its round shape, central peak, and concentric faults, features common in known impact craters. Alternative explanations included underground salt movement or volcanic activity causing seabed collapse. In 2009, a gathering of geologists largely rejected the impact hypothesis, as reported in Geoscientist magazine.
Recent findings, published in Nature Communications, overturn that conclusion. Dr. Uisdean Nicholson, a sedimentologist at Heriot-Watt University's School of Energy, Geoscience, Infrastructure and Society, led the investigation with support from the Natural Environment Research Council. The team analyzed new seismic imaging and rock samples from a nearby oil well, revealing rare shocked quartz and feldspar crystals at the crater's depth. These minerals, formed only under extreme shock pressures from asteroid impacts, provided crucial proof.
Dr. Nicholson stated: "New seismic imaging has given us an unprecedented look at the crater. Samples from an oil well in the area also revealed rare 'shocked' quartz and feldspar crystals at the same depth as the crater floor. We were exceptionally lucky to find these -- a real 'needle-in-a-haystack' effort. These prove the impact crater hypothesis beyond doubt."
The evidence points to a 160-meter-wide asteroid striking the seabed at a shallow angle from the west. Dr. Nicholson added: "Our evidence shows that a 160-meter-wide asteroid hit the seabed at a low angle from the west. Within minutes, it created a 1.5-kilometer high curtain of rock and water that then collapsed into the sea, creating a tsunami over 100 meters high."
Professor Gareth Collins of Imperial College London, who contributed numerical simulations and attended the 2009 debate, remarked: "I always thought that the impact hypothesis was the simplest explanation and most consistent with the observations. It is very rewarding to have finally found the silver bullet."
Dr. Nicholson described Silverpit as "a rare and exceptionally preserved hypervelocity impact crater." He noted that Earth's dynamic processes, like plate tectonics and erosion, destroy most such traces, leaving around 200 confirmed craters on land and about 33 beneath the ocean. The discovery aligns Silverpit with sites like the Chicxulub Crater in Mexico, linked to the dinosaur extinction, and the Nadir Crater off West Africa.
