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15 December 2010
Seismic waves move through the Earth’s deep core at different speeds, depending on where they are and in which direction they’re going.
Six hundred kilometers beneath the Americas, vibrations generated by earthquakes travel faster when they’re traveling north or south, compared to east or west. It’s as though the seismic waves are following highways running from pole to pole, but meandering along windy country lanes when they’re moving along the equator.