Hawaii can give birth to a giant tsunami. It is almost unimaginable: a tsunami of more than 1,000 feet (300 meters) high coming to Hawaii. But scientists have new evidence — these waves of monsters-called mega-tsunamis, do just that. The findings were presented at the annual meeting of the American Geophysical Union.
Unlike the tsunami from the earthquake, tsunami hit the Hawaiian when there is widespread decay chain of volcanoes on the islands and begin the huge landslides. This happens about once every 100,000 years, and is associated with climate change, said Gary McMurtry (McMurtry), Professor, University of Hawaii in Honolulu.
About 250,000 years ago, the tsunami washed up huge rocks 820 feet (250 m), on the slopes of the island, said Fernando Marquez, a professor at the University of Lisbon in Portugal. (The main island of Hawaii is one of the largest volcanoes in the world). McMurtry team found traces of the two younger and slightly smaller tsunami in South Point (South Point), the main island of Hawaii, one occurred 50,000 years ago, and more — 13,000 years.
Deadly landslides cause tsunamis occur on the volcanic islands around the world, and are a potential threat to the eastern United States. "We find them everywhere, but we do not know all the historical events, so we have to go back in time," — said Anthony Hildenbrand (Hildenbrand), a volcanologist at the University of Paris-Sud (Paris-Sud) in France, which has helped to reveal the ancient place of origin of the tsunami. Giant landslides seem to occur during periods of rising sea level, the climate is also a warm and humid, said Hildenbrand edition OurAmazingPlanet.
The researchers suggest that sea level rise could destabilize the flanks of volcanic islands, and prolonged and heavy rain can be soaked their steep slopes, firing trigger landslides. There are at least 15 giant landslides that slid from Hawaii in the last 4 million years, since it's only been the last 100,000 years, according to the U.S. Geological Survey. Then slid a block of rock the size of Manhattan.