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Now researchers have evidence suggesting that an asteroid roughly 200 yards (183 meters) wide crashed off the coast of New Jersey and sent tsunamis surging toward what is now New York City some 2,300 years ago.
New York City lies at the mouth of the Hudson. When the scientists drilled out tubes of sediment from the New York and New Jersey area, they discovered layers of unusual debris that, they suggest, were laid down by tsunamis.
Within these potential tsunami layers is evidence of a cosmic impact, including shocked minerals and microscopic carbon beads loaded with "nano-diamonds," which are "all things only impacts can do," Abbott said. One candidate for the crater that was produced by this impact, she said, lies in the undersea Carteret Canyon, located roughly 90 miles (150 km) off the coast of New Jersey.
1908 is pretty close to modern times in my book and we had an impact in Tunguska of an object about 30-50 meters:
Originally posted by Aggie Man
Wow, this is interesting. Imagine what kind of havoc this would have caused if it had hit in modern times.
Earth's upper atmosphere is hit about once a year by asteroids that release energy equivalent to five kilotons of TNT. The object that exploded above Tunguska, Siberia in 1908 was considered 'small' (30 to 50 metres across), yet its energy was big enough to flatten 2,000 square kilometres of forest. It would have completely destroyed a city the size of New York. Brown and his colleagues calculate that Tunguska- like events may occur as frequently as once every 400 years.