what happened? One idea is that two great powers are fighting for control of the heart of the world. The Earth’s magnetic field, generated by swirling iron currents in the liquid outer core, pulls and rotates the inner core. That impulse is counteracted by the mantle, the slimy layer that lies above the outer core and below the Earth’s crust, and its enormous gravitational field grips the inner core, slowing its rotation.
By studying core-diving seismic waves recorded from the 1960s to the present, Dr. Song and Yi Yang, another Peking University seismologist and co-author of the study, found that this tremendous tug of war caused the inner core to spin back. I’m assuming you let It repeats in a cycle of about 70 years.
In the early 1970s, the inner core was not spinning compared to a person standing on the Earth’s surface. Since then, the inner core has gradually spun eastward, eventually overtaking the surface. The rotation of the inner core then slowed and appeared to stop at some point between 2009 and 2011.
The inner core is now slowly beginning to rotate westward relative to the Earth’s surface. It may accelerate, then decelerate again, reaching another apparent standstill in the 2040s, completing its latest east-west rotation cycle.
If this 70-year rhythm exists, it can have tangible effects on parts of the planet. deeper gutsHowever, it may only be able to stir relatively little turbulence near the surface. Perhaps by causing subtle changes in the planet’s magnetic field or tweaking the length of the day, Increments by 1 millisecond every 6 years.
This is just one of several competing models that explain the erratic voyage of waves reaching the core.the innermost layer of the earth staggerConversely, the Earth’s iron core may have a metamorphic surface that twists seismic waves that penetrate it. “No matter which model you like, there are some data that don’t match it,” Dr. Vidale said.
Due to its inaccessibility, this abyssal realm may remain unexplained forever. “There are certainly possibilities that we will never figure out,” Dr. Vidale said. However, he added: The parts will fall into place at some point. ”
