Quake shook earth to core
Quake shook earth to core: "The quake that set off the devastating tsunami literally shook the Earth to its core, scientists believe, accelerating its rotation and shortening days by a fraction of a second. It may be necessary to add a 'leap second' in years to come in order to correct the change.
Meanwhile, experts said the quake, which measured 9.0 on the Richter scale, may have shifted some small islands in the region by more than 30 metres.
Richard Gross, a geophysicist with Nasa's jet propulsion laboratory in California, said he believed a shift of mass towards the Earth's centre caused the planet to spin three microseconds - one millionth of a second - faster. It also caused the planet to tilt around 2.5cm on its axis."