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That tsunami didn't travel far inshore, but others did. Ted argues that a tsunami that hit the Shoalhaven delta near Nowra, between 5000 and 4000 years ago, ran 10 km inland, while deposits near the Blue Mountains hint that another tsunami ran over cliffs more than 60 m high, and then rushed inland. A similar event today would have the potential for widespread destruction.
When energy pushes the plates horizontally, the land does not raise or lower the water above it enough to cause a tsunami, Bellini said. The height of a tsunami wave is influenced by the ground's vertical movement, so changes in the seafloor's topography can either amplify or dampen a wave as it travels along.When moving in the ocean, a tsunami wave typically travels at up to 500 or 600 miles an hour â roughly the speed of a jet, Blakeman said.hen energy pushes the plates horizontally, the land does not raise or lower the water above it enough to cause a tsunami, Bellini said. The height of a tsunami wave is influenced by the ground's vertical movement, so changes in the seafloor's topography can either amplify or dampen a wave as it travels along.