The change was caused by a shift of mass towards the planet's centre, as the Indian Ocean's heavy tectonic plate lurched underneath Indonesia's one, say researchers at NASA's Jet Propulsion Laboratory in Pasadena, California. This caused the globe to rotate faster, in the same way that a spinning figure-skater accelerates by tucking in her arms.The blast literally rocked the world on its axis, add Richard Gross and his NASA colleagues. They estimate that Earth now tilts by an extra 2.5 centimetres in the wake of the jolt.
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