Scientists have long debated whether the Earth's outer shell can vibrate. Previous evidence of this
True polar wander is a process wherein which the geographic locations of the North and South Poles change. The authors of a new work from the Tokyo Institute of Technology have found evidence of a pole shift in the Earth's past.
The earth is a ball that consists ofa large number of layers, and inside it is a solid metal core. Since the Earth's outer core is liquid, solid mantle and crust can slide over it.
Over long periods of time fluctuationsthe mantle and crust do not affect the core in any way. On the other hand, convection patterns in this outer core actually move around the Earth's axis of rotation. This means that the pattern of the Earth's magnetic field is predictable.
Imagine looking at Earth from space. A true polar walk will look like the Earth is toppling on its side.
Name Joe Kirschvink, professor at Caltech
The authors of the work decided to check whether there waspole shift in the Late Cretaceous, about 84 Ma ago. They studied the paleomagnetic data of limestones formed in the Cretaceous period about 145.5–65.5 million years ago.
Researchers were able to confirm the receiveddata that 84 million years ago there was a tilt of the planet by about 12 °. The team also found out that after capsizing on its side, the Earth changed course and turned back. As a result, the total deviation was almost 25 ° over about 5 million years.
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