Question

define tsunami for class 8​

Answer 1

Explanation:

A tsunami is a natural disaster which is a series of fast-moving waves in the ocean caused by powerful earthquakes, volcanic eruptions, landslides, or simply an asteroid or a meteor crash inside the ocean. A tsunami has a very long wavelength. It can be hundreds of kilometers long. Usually, a tsunami starts suddenly.

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Answer 2

Answer:

Tsunami is a natural disaster .It is a high waved series of water.It can be caused due to displacement of large water body, earthquake, volcanic eruption , underwater landslide, impact of large metorite etc . You can also see cause from the given image. The term tsunami is a borrowing from the Japanese word tsunami 津波, meaning "harbour wave".The wave further slows and amplifies as it hits land. Only the largest waves crest.

The first scales used routinely to measure the intensity of tsunamis were the Sieberg-Ambraseys scale (1962), used in the Mediterranean Sea and the Imamura-Iida intensity scale (1963), used in the Pacific Ocean. The latter scale was modified by Soloviev (1972), who calculated the tsunami intensity "I" according to the formula:

$\,{\mathit {I}}={\frac {1}{2}}+\log _{{2}}{\mathit {H}}_{{av}}$

Seismicity

Tsunamis can be generated when the sea floor abruptly deforms and vertically displaces the overlying water. Tectonic earthquakes are a particular kind of earthquake that are associated with the Earth's crustal deformation; when these earthquakes occur beneath the sea, the water above the deformed area is displaced from its equilibrium position.More specifically, a tsunami can be generated when thrust faults associated with convergent or destructive plate boundaries move abruptly, resulting in water displacement, owing to the vertical component of movement involved. Movement on normal (extensional) faults can also cause displacement of the seabed, but only the largest of such events (typically related to flexure in the outer trench swell) cause enough displacement to give rise to a significant tsunami, such as the 1977 Sumba and 1933 Sanriku events

Lituya Bay

It is the world record run up height of 1720 feet in alaska on 9 July 1958.6

Explanation:

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