German surfer Sebastian Steudtner rides a wave during a free surfing session at Praia do Norte, in Nazaré, Portugal, on Nov. 5. (Jean-Christophe Bott/EPA-EFE/Shutterstock)
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When an ocean wave falls, the ground shakes. Now, those wobbles are getting bigger.

Stormier seas and larger ocean swell in recent decades are pounding Earth’s seafloor with more force, sending larger ripples through Earth’s crust — almost like a tiny, tiny, tiny earthquake. The biggest wave energy increases, as measured with a seismometer, appear in the North Atlantic Ocean, according to recent research.