Earth’s inner core may have stopped spinning as part of seven-decade cycle, say scientists | World News

The spinning core at Earth’s center has recently stopped spinning, relative to the surface, as part of a seven-decade cycle, scientists have said.

The inner core, which is the size of Pluto, could have stopped spinning around 2009, a study says.

This may be possible because the inner core is mostly a solid ball of iron floating in the liquid outer core, so its rotation does not necessarily correlate with the rotation of the rest of the planet.

The scientists also said that the inner core may have started rotating in the opposite direction instead.

If so, something is probably going on with the magnetic and gravitational forces that drive the rotation of the core.

The research could help understand how fundamental changes can affect things on Earth’s surface, such as day length and navigation.

Seismic waves from Earthquakes As part of the study, those that passed through the planet’s inner core were analyzed.

Wave tracking found there showed “little change over the past decade” in paths that previously showed “significant temporal changes”.

The process is part of a “nearly seven-decade cycle,” the study reported.

Peking University scientists China Believe “this persistent pattern globally suggests that inner core circulation has recently stopped”.

They wrote: “We compared this recent pattern to the Alaska earthquake record of the South Sandwich Islands going back to 1964 and it appears to be part of a nearly seven-decade oscillation of the gradual subduction of the inner core. associated with turning. Another turning point in the early 1970s.”

Their observations, published in the journal Nature Geoscience, provide further evidence of “dynamic interactions” between Earth’s different layers that can influence changes in the magnetic field and surface.

The Earth’s core is a solid ball with a radius of about 800 miles and a temperature equal to the surface of the Sun.

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Previous research has shown that the core is separated from the rest of the planet by an outer core of liquid metal, allowing it to spin freely and at different speeds than the rest of Earth.

Other scientists have noted the research, but believe it could take years to determine its validity.

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