What is a mega-tsunami?
A mega-tsunami is simply a gigantic wave, one big enough to cross oceans and destroy cities. They can be thousands of feet high moving at supersonic speeds. They can be caused by huge meteors crashing into the ocean, or by massive landslides. No boat or building hit by a mega tsunami could survive. But now scientists believe that we could be sitting on a time bomb, that sooner or later one will destroy New York, Boston and Miami, and that nothing could stop it. When was the biggest tsunami? The largest tsunami in recorded history was in Lituya Bay, Canada, 1958. An earthquake measuring 8.3 on the Richter scale caused 40 million cubic metres of rock to fall into the sea. A wave more than half a kilometre high was created that surged through the bay devastating all in its path. This was not even a mega-tsunami, by these standards it was tiny, but it did show scientists what sort of wave a small landslide could cause. But what would be the effect of a big one? Where have mega tsunamis occ
