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Why some underwater earthquakes cause tsunamis – and others, just little ripples

By Matthew Blackett, Reader in Physical Geography and Natural Hazards, Coventry University

After a massive earthquake off the coast of Kamchatka, a peninsula in the far east of Russia, on July 30 2025, the world watched as the resultant tsunami spread from the epicentre and across the Pacific Ocean at the speed of a jet plane.

In some local areas, such as in Russia’s northern Kuril Islands, tsunami waves reached heights of over three metres.…

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