This periodic change in rotation might be due to a tug-of-war effect between the Earth’s liquid outer core and solid mantle, writes the Times. As molten metals move in the outer core, they generate electromagnetic forces that influence the inner core to spin. But the gravity...
“After decades of research and debates, we are coming to an ever-clearer picture of thechanginginner core,” saysXiaodong Song, a seismologist at Peking University in China who was not involved in the work, toNature News’ Alexandra Witze. These...
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.
SeismologyEarthquakes ringing through the planet illuminate how its heart is transforming.#Earthquakes ringing through the planet illuminate how its heart is transforming.doi:10.1038/d41586-025-00395-7Alexandra WitzeNature Publishing Group UKNature
It is currently unknown whether the Earth's inner core is changing speed, as it is difficult to directly observe the inner core due to its depth and inaccessible location. However, some recent studies using seismic data have suggested that the inner core may be rotating slightly faster or slow...
Vidale said the inner core’s slowing speed was caused by the churning of the liquid iron outer core that surrounds it, which generates Earth’s magnetic field, as well as gravitational tugs from the dense regions of the overlying rocky mantle. ...
“Interestingly, Edmund Halley, namesake of Halley’s Comet, speculated that the inner shells of the Earth rotate with a different speed back in 1692.” Scientists have so far assumed the rotation rate of the inner core to be constant because they lacked adequate mathematical methods for interpre...
to remove (a cylindrical sample) from the interior, as of the earth or a tree trunk: to core the ocean bottom. to form a cavity in (a molded object) by placing a core, as of sand, in the mold before pouring. adjective of central importance; basic; fundamental: ...
“We can compare the signals that we see when the inner core is returned to the same position as it was in some other time and see if there’s differences that can’t be explained by the rotation,” Vidale, Dean’s Professor of Earth Sciences at the University of Southern California’s...
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