A Tsunami is a large wave. The name actually means 'Harbour wave' in Japanese.
The wave can travel large distances, at high speed and only build up into a tall wave, when it hits shallow water.
Can be caused by underwater earthquakes or land slippage.
Tsunamis cause damage by two mechanisms: the smashing force of a wall of water travelling at high speed, and the destructive power of a large volume of water draining off the land and carrying a large amount of debris with it, even with waves that do not look large.
While everyday wind waves have a wavelength (from crest to crest) of about 100 metres (330 ft) and a height of roughly 2 metres (6.6 ft), a tsunami in the deep ocean has a much larger wavelength of up to 200 kilometres (120 mi). Such a wave travels at well over 800 kilometres per hour (500 mph), but owing to the enormous wavelength the wave oscillation at any given point takes 20 or 30 minutes to complete a cycle and has an amplitude of only about 1 metre (3.3 ft).[25] This makes tsunamis difficult to detect over deep water, where ships are unable to feel their passage.
The reason for the Japanese name "harbour wave" is that sometimes a village's fishermen would sail out, and encounter no unusual waves while out at sea fishing, and come back to land to find their village devastated by a huge wave.
As the tsunami approaches the coast and the waters become shallow, wave shoaling compresses the wave and its speed decreases below 80 kilometres per hour (50 mph). Its wavelength diminishes to less than 20 kilometres (12 mi) and its amplitude grows enormously. Since the wave still has the same very long period, the tsunami may take minutes to reach full height. Except for the very largest tsunamis, the approaching wave does not break, but rather appears like a fast-moving tidal bore.[26] Open bays and Coastlines adjacent to very deep water may shape the tsunami further into a step-like wave with a steep-breaking front.
When the tsunami's wave peak reaches the shore, the resulting temporary rise in sea level is termed run up. Run up is measured in metres above a reference sea level.[26] A large tsunami may feature multiple waves arriving over a period of hours, with significant time between the wave crests. The first wave to reach the shore may not have the highest run up.[27]
About 80% of tsunamis occur in the Pacific Ocean, but they are possible wherever there are large bodies of water, including lakes. They are caused by earthquakes, landslides, volcanic explosions, glacier calvings, and bolides.
sound waves
The events that cause tsunamis involve huge releases of energy. The main events causing tsunamis are-underwater volcanic eruption, earthquake or a landslide.
earth quakes tsunamis
The balls
Tsunamis that are triggered by volcanic eruptions
Tsunamis cannot be prevented.
The events that cause tsunamis involve huge releases of energy. The main events causing tsunamis are-underwater volcanic eruption, earthquake or a landslide.
the main feature of a rodent is the teeth
They are fully surrounded by water.
earth quakes tsunamis
Tsunamis occur after an earthquake. Earthquakes that occur in the middle of the ocean can force a tsunami to make landfall.
in the center of a roman toownhouse was the atrium (living room) witch connected all the other rooms (kitchen, bed rooms, ect.) though roman were very proud of there gardens.
the main feature that controls the bridge type is the size of the obstacle
The main feature of the F-22 would be it's stealth capability.
One main feature of the Articles of Confederation was that each state had one vote in Congress. Another feature was the obvious lack of a federal system.
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