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Especially missing brighter than sun fireball rising from impact point might be little hard.
Originally posted by cmdrkeenkid
My point is that no, someone would have seen this happen. Yes, an asteroid hitting the ocean or any other large body of water would displace A LOT of it and cause a tsunami, but again, someone would have seen it.
The Bravo crater in the atoll reef had a diameter of 6510 ft, with a depth of 250 ft. Within one minute the mushroom cloud had reached 50,000 feet (15 km), breaking 100,000 feet (30 km) two minutes later. The cloud top rose and peaked at 130,000 feet (almost 40 km) after only six minutes. Eight minutes after the test the cloud had reached its full dimensions with a diameter of 100 km, a stem 7 km thick, and a cloud bottom rising above 55,000 feet (16.5 km).
Past impacts with water or ice are very difficult to detect, because they leave very little evidence. One such impact is known to have occurred in the South Pacific Ocean, near Chile, about 2 million years ago. This event -- known as "Eltanin" after the ship that discovered the deposits -- involved an asteroid between 1 and 3 miles in diameter that would have created a water crater at least 40 miles across. Tsunami would have swamped coasts around the Pacific and would even have reached some Atlantic coastlines. Assuming a typical run-up factor of three, the coast of Chile would have been inundated by 250-yard-high tsunami. Likely results for other locations: Hawaii 90-yard tsunami (probably higher due to the greater run-up factor); California, 60 yards; Japan and Australia, 25 yards; New Zealand; 120 yards.
Despite this presumed destruction to coastal areas, there is no evidence of global climate change or regional extinctions around this time, when our early ancestors, Australopithecus, were roaming Africa.
Originally posted by orionthehunter
such as the one that struck Siberia in 1908 "the Tunguska comet"
Originally posted by defcon5
My first thought when I heard about the Tsunami was that it was an asteroid impact. The thing that made me suspect this was not the case was the aftershock quakes. Would you get aftershocks from an asteroid strike?
Originally posted by MERC
What is the basis behind this claim? I thought the 1908 Tunguska incident was still very much unexplained.
Originally posted by orionthehunter
I believe there are clues that even the dark and very cold middle ages or dark ages may have been caused by an impact. I just don't have the evidence to back up any of that. I'm not the first to state that theory though.
For example, the model shows that waves radiating from the impact of a 300-metre-wide asteroid would carry 300 times more energy than the 2004 Asian tsunami
Source: newscientist.com