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Earthquakes are pretty common; there are dozens of small to medium quakes every day, and a fairly large one every month or so. If an earthquake happens at sea, along a coastline, it's possible that the earthquake will cause an underwater avalanche, and if there is, the falling rock and mud will displace a lot of water - and cause a tsunami. You won't always have a tsunami, even with fairly big quakes, but it's always something to be aware of.

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11y ago

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