Which of the following properties of Tsunamis are correct?(A) Tsunamis are gravity waves similar to ocean waves , but non-dispersive;(B) On the ocean the maximum amplitude is 0.5 - 1.5 m and the speed between 700 and 900km/h;(C) Tsunamis are short-period waves (2-20 s) with wavelength from tens to hundreds of meters; (D) The maximum height of a tsunami is between 2 and 6m;(E) The run-up of a tsunami is its maximum speed;(F) Tsunamis can be caused by strong earthquakes and by volcanic eruptions;(G) A vertical displacement of the water column is needed to induce a tsunami during earthquakes;

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