Moving masses of rock by several meters affects rotation
(NEWSER) - The magnitude 8.8 earthquake that hit Chile may have actually shifted the Earth's axis, shortening the length of a day, a NASA scientist says. Moving hundreds of kilometers of rock changes the earth's distribution of mass, and, in turn, changes the planet's rate of rotation. In this case, the axis likely shifted by about 3 inches, shortening the day by about 1.26 microseconds. More»