Few of us give much thought to Earth's swirling, spinning contents until some sudden movement, an earthquake or a volcanic eruption, jolts us to our senses.
The speed of this rotation, and whether it varies, is still debated today. Yet the inner core carries on its merry way, unaware of the raucous debate above.
Now, in the new study with Yang, Song has revisited that old data, comparing it to more recent patterns of near-identical seismic waves which suggest the inner core has slowed to a stop – and could even be reversing. Based on their calculations, a small imbalance in the electromagnetic and gravitational forces would be sufficient to slow, and then reverse the inner core's rotation as observed.
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