Science, Space and Technology News 2024
The inner core began to decrease its speed around 2010, moving slower than the Earth’s surface. Credit: USCscientists have discovered that the Earth’s inner core is slowing down relative to the planet’s surface, a phenomenon that started around 2010 after decades of the opposite trend. This significant shift was detected through detailed seismic data analysis from earthquakes and nuclear tests.
The inner core is a solid iron-nickel sphere surrounded by the liquid iron-nickel outer core. Roughly the size of the moon, the inner core sits more than 3,000 miles under our feet and presents a challenge to researchers: It can’t be visited or viewed. Scientists must use the seismic waves of earthquakes to create renderings of the inner core’s movement.utilized waveforms and repeating earthquakes in contrast to other research.
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.The implications of this change in the inner core’s movement for Earth’s surface can only be speculated.
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