What is the wave height of a tsunami?
Tsunamis have a small wave height offshore, and a very long wavelength (often hundreds of kilometres long, whereas normal ocean waves have a wavelength of only 30 or 40 metres),  which is why they generally pass unnoticed at sea, forming only a slight swell usually about 300 millimetres (12 in) above the normal sea surface.
How high do tsunami waves travel?
Though tsunami waves are only a few feet to several meters high as they travel over the deep ocean, it is their speed and long wavelength that cause the change to dramatic heights when they are forced to slow at the shore. Powerful undersea earthquakes are responsible for most tsunamis.
What was the size of the tsunami that hit Japan?
Forecasted wave heights were up to 33 ft (10 m) and there were many reports of tsunami waves three stories high in parts of Japan. Across the Pacific Ocean, many countries issued evacuations along the coasts because of the predicted tsunami waves.
What is amplitude of tsunami?
Amplitude, Wave Height, or Tsunami Height: Amplitude of Tsunami refers to its height relative to the normal sea level. It is usually measured at sea level, and it is different from the crest-to-trough height which is commonly used to measure other type of wave height.
Can we predict the size of a tsunami?
The first is a model run of predicted tsunami wave heights from the Center for Tsunami Research at the NOAA Pacific Marine Environmental Laboratory. It shows the predicted wave heights of the tsunami as it travels across the Pacific basin. The largest wave heights are near the earthquake epicenter, off Japan.
What is the drawback of a tsunami?
Drawback. All waves have a positive and negative peak; that is, a ridge and a trough. In the case of a propagating wave like a tsunami, either may be the first to arrive. If the first part to arrive at the shore is the ridge, a massive breaking wave or sudden flooding will be the first effect noticed on land.
What happens if the first part of a tsunami reaches land?
If the first part of a tsunami to reach land is a trough-called a drawback-rather than a wave crest, the water along the shoreline recedes dramatically, exposing normally submerged areas.
What are the effects of tsunamis on humans?
The trees and nesting sites, which are confined to the coastal area, are the most affected ones. Also, the flood caused by tsunami destroy farmland and plants grown for the consumption of human population. A large amount of water gives effect to the water-borne diseases.
What is a tsunami?
Tsunami is a series of giant waves which generate due to the displacement of land beneath the water surface. This displacement disturbs the still water and generates tens of meters long waves. When the wave breaks at the shore, its height increases which become a cause of coastal destruction. The maximum height recorded, so far, is 278 feet.
How many people are killed by tsunamis?
Hundreds and thousands of people are killed by Tsunamis. The force of the tsunami wave may kill people instantly or they may drown as water rushes on the land. People may also be killed if a building is knocked down by the tsunami and it hits them.