The Impact
If one assumes the meteor impact theory is right, the size of the crater can be combined with assumptions about the speed of an impacting object to estimate the size of the impactor itself. Impacting objects are generally moving at speeds of the order of 20–50 km/s, and at these speeds an object about 120 m (393 feet) across and with a mass of 2.0×109 kg would be required to form a Silverpit-sized crater, if the object was rocky. If it had been a comet, the crater would have been larger.
For comparison, the object which struck the Earth at Chicxulub is estimated to have measured approximately 9.6 km (6 miles) across, while the object responsible for the Tunguska event in 1908 is thought to have been a comet or asteroid about 60 m (196 feet) across, with a mass of about 4×108 kg.
An object 120 m (393 feet) across smashing into the sea at many kilometers per second would generate enormous tsunamis. Scientists are currently searching for any evidence of large tsunamis in the surrounding areas dating from around that time, but no such evidence has been uncovered yet.
Read more about this topic: Silverpit Crater
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