Exactly how the inner core rotates has been a matter of debate between scientists - and the latest research is expected to prove controversial.
What little we know about the inner core comes from measuring the tiny differences in seismic waves — created by earthquakes or sometimes nuclear explosions — as they pass through the middle of the Earth.published in the journal Nature GeoscienceThe study's authors, Xiaodong Song and Yi Yang of China's Peking University, said they found that the inner core's rotation"came to near halt around 2009 and then turned in an opposite direction.
They said it previously changed direction in the early 1970s and predicted the next about-face would be in the mid-2040s. But the researchers said they believed there are physical links between all Earth's layers, from the inner core to the surface. That time frame is around the point when Monday's research says the inner core last changed direction — which Vidale called"kind of a coincidence."
"These mathematical models are most likely all incorrect because they explain the observed data but are not required by the data," Tkalcic said.
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