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The latest development is ambiguous and variable

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What is happening here? One idea is that two giant powers are fighting for control of the core of the world. Earth’s magnetic field, generated by the swirling iron currents in the liquid outer core, pulls on the inner core, causing it to spin. The mantle, the mucous layer above the outer core and under the Earth’s crust, resists this thrust by the huge gravitational field that keeps the inner core down and slows its rotation.

Studying seismic fundamental subduction waves recorded from the 1960s to the present day, Dr. Song Wei Yang, another seismologist at Peking University and co-author of the study, posits that this massive conflict causes the inner core to rotate backwards. And back and forth in a cycle of about 70 years.

In the early 1970s, to a person standing on Earth’s surface, the inner core was not spinning. Since then, the inner core has gradually rotated faster eastward, eventually outpacing the rotational speed of Earth’s surface. After that, the inner core’s rotation slowed until it seemed to stop sometime between 2009 and 2011.

The inner core now rotates gradually westward relative to the Earth’s surface. It will likely accelerate and then slow again, coming to another apparent stopping point in the 40s and completing its final east-west turn.

This 70-year rhythm, if it exists, could have a measurable impact on parts of the Earth. deeper gut. But they can only cause a relatively minor perturbation near the surface—perhaps by triggering small changes in the planet’s magnetic field, or even a slight change to the length of the day, which is known to rise and fall by a fraction of a millisecond every six years.

It is just one of many competing models to explain the irregular wave paths of the heart. It is also possible that the deepest layer of the Earth wobbled. Conversely, Earth’s iron core could have a shifting surface, twisting any seismic waves that penetrate it. “No matter which model you like, there is data that you don’t agree with,” said Dr. Vidal.

Since this immemorial realm was inaccessible, he could forever escape explanation. “It is certainly possible that we may never know,” said Dr. Vidal. But he added: “I am hopeful. One day the pieces will fall into place.”

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