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Tsunamis are some of the most powerful and deadliest forces of nature. Within in recent memory you can recall both the 2004 Indian ocean Tsunami and 2011 Japan Tsunami. Both of which resulted in catastrophic damage and loss of life. The Indian ocean Tsunami happened after a massive earthquake struck in the Indian ocean. The earthquake itself released more energy than every single explosive used in world war 2 even the nuclear bombs. This enormous energy created the tsunami of height 30 meters(100 feet). The wave smashed into Indonesia south Asia and the east coast of Africa.

Japan Tsunami was also created by an earthquake that was 40.5 meters(133 feet) just about 5 meters shorter that the statue of liberty. An estimated of $300 billion damage was done. Which is more than the entire GDP of south Africa($280 Billion).

But there are just called regular Tsunamis. There is a entire other class of gigantic waves that are called Mega tsunamis. Unlike regular Tsunami , mega tsunami is created when massive object hit the water and displaces it.

So How High can It get really?

  in some cases, they can generate a mega-tsunami that can reach the height of hundreds of meters. That is the case when a massive landslide occurs in a limited body of water and the resulting wave is unable to disperse, just as it happened in Alaska where a major rock fall generated the Lituya Bay tsunami. It was the largest tsunami wave ever observed anywhere in the world and it was caused by a rock fall in Lituya Bay, Alaska on July 9, 1958. 

 The Lituya Bay mega-tsunami was triggered by an earthquake with a magnitude of 8.0 occurred along the Alaskan Fairweather Fault, which runs beneath the north-western spur of Lituya Bay. A massive volume (approximately 40 million cubic meters) of rock alongside the Gilbert Inlet sloughed off into the water, generating a wave which reached the incredible height of 525 meter (1,720 feet) on the opposite side of the inlet. Down the inlet itself, the initial wave reached a height of 600 feet (120 meter) moving toward the ocean at 100 mph (160 km/h).Five square miles of land surrounding the bay were inundated and stripped of all vegetation and wildlife. The tsunami sunk three solitary fishing boats anchored in the harbour and moved inland as far as 3600 feet. However, the tsunami's energy and height diminished rapidly away from the source area and, once in the open ocean, it dissipated and was hardly recorded by tide gauge stations. 

 On October 9, 1963, approximately five years after the Lituya Bay disaster, an enormous landslide of about 260 million cubic metres of forest, earth, and rock, fell into the reservoir of one of the highest dams in the world, the Vajont Dam on Monte Toc, Italy, at up to 110 km per hour (68 mph). The resulting displacement of water caused 50 million cubic metres of water to overtop the dam in a 250-metre high megatsunami wave. The flooding destroyed the villages of Longarone, Pirago, Rivalta, Villanova and Faè, killing 1,450 people. More than 2,000 people (some sources report 1,909) perished in total. 

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