Volcanic Shoaling


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Volcanic Shoaling animation

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© Geoscience Australia

As the tsunami leaves the deep  water of the open ocean and approaches the shallower waters near the coast, it slows down and may grow in height depending on the shape of the seafloor.

A tsunami that is unnoticeable by ships at sea may grow to be several metres or more in height near the coast.

Our example tsunami is now 1.5 metres high with a wavelength of 100 kilometres and is moving at about 400 kilometres an hour.

Topic contact: hazards@ga.gov.au Last updated: October 27, 2011