The great Tohoku earthquake in Japan two years ago was so big its effects were even felt at the edge of space.
Scientists say the Magnitude 9.0 tremor on 11 March 2011 sent
a ripple of sound through the atmosphere that was picked up by the Goce
satellite.
Its super-sensitive instrumentation was able to detect the
disturbance as it passed through the thin wisps of air still present
255km above the Earth.
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