Amplified sound waves shook Earth’s upper atmosphere, study says.

The giant earthquake and tsunami that devastated Japan in March were so strong that their vibrations almost reached space, a new study says.

The vertical motion of the ground shaking and swelling tsunami waves produced the vibrations, which pressed upward against the overlying air, said Emile Okal, a geophysicist at Northwestern University who was not part of the study team.

This process has been known from previous earthquakes, but the vibrations from Japan caused the biggest such effect yet measured.

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