Asteroid Hit North Sea Triggered A Tsunami as Tall as a 30-Storey Building — Could It Happen Again?

Scientists have confirmed that a vast underwater structure in the North Sea was created by an asteroid that struck the seabed millions of years ago. The finding resolves a decades-long scientific debate about the origin of the formation located off the coast of Yorkshire in northern England. The impact formed what is now known as the Silverpit Crater and triggered a tsunami with waves estimated to have exceeded 100 metres in height.

The research was led by Dr Uisdean Nicholson of Heriot-Watt University in Edinburgh and supported by Professor Gareth Collins of Imperial College London. Using advanced 3D seismic imaging and geological sampling, the team identified microscopic 'shocked' minerals that can only form under the extreme pressures produced by an asteroid impact. The findings were published in the journal Nature Communications.

Researchers now estimate the collision occurred during the middle Eocene epoch around 43 to 46 million years ago. At the time, the region was covered by a shallow sea. A roughly 160-metre-wide asteroid is believed to have struck the seabed at a shallow angle from the west, displacing vast volumes of water and ejecting debris high into the atmosphere.

Mechanics of a Mega-Tsunami

When a large asteroid strikes the ocean at hypervelocity speeds, the impact releases enormous energy within seconds. In the case of the Silverpit event, simulations suggest the asteroid punched through the water column and struck the seabed almost instantly.

Computer simulations conducted at Imperial College London indicate that the impact created a towering 'curtain' of water and rock that rose up to 1.5 kilometres into the air before collapsing back into the sea. That collapse generated tsunami waves exceeding 100 metres in height that spread across the North Sea basin.

Silverpit Crater Discovery

The Silverpit structure lies about 700 metres beneath the seabed in the southern North Sea, roughly 80 miles from the Yorkshire coast. It was first identified in seismic surveys conducted in 2002, when geologists discovered a circular crater measuring around 3 kilometres in diameter.

The formation is surrounded by a ring of concentric faults spanning roughly 20 kilometres. For years scientists debated whether the structure was created by an asteroid impact or by geological processes such as underground salt movement. New seismic data and the discovery of shocked quartz and feldspar crystals have now confirmed that the crater was produced by a high-energy cosmic collision.

Monitoring Future Risks

Scientists emphasise that events on this scale are extremely rare. Asteroids large enough to generate tsunamis of this magnitude are estimated to strike Earth only once every few hundred thousand years.

Space agencies including the European Space Agency and NASA currently monitor thousands of near-Earth objects to assess potential collision risks. These detection systems are designed to identify hazardous asteroids long before they approach Earth, allowing time to develop possible planetary defence strategies.

The confirmation of Silverpit as an impact crater also expands the global record of known impact sites. Around 200 confirmed impact craters have been identified on land, while only about 33 have been discovered beneath the oceans, making Silverpit one of the relatively rare examples preserved below the seabed.