It is caused by sudden movement in the ocean floor. Such as an earthquake, a powerful volcanic eruption, or an underwater landslide. The impact of a large meteorite could could cause a Tsunami.
Tsunami occur most often in the Pacific Ocean and Indonesia Ocean. Because the pacific rim bordering the ocean has a large number of active submarine earthquake zones. However, tsunamis have also occurred recently in the Mediterranean Sea region and are expected in the Caribbean Sea as well.
A tsunami is a series of waves called a wave train.
283000 people died in the 2004 tsunami.
Palm trees with there long, bare trunks are well adapted to life on shore and often survive tsunami intact.
A Mega Tsunami is a tsunami with extremely high waves and is usually caused by a landslide. A Mega Tsunami occurred at Lituya Bay, Alaska in 1958, creating the tallest tsunami ever recorded at 1700 feet high. Miraculously only to people died.