the direction of rotation of the earth’s center is reversed
On the basis of a research, it has been told that the Earth’s solid inner core, which is a ball of hot iron, has stopped its rotation and started rotating in the opposite direction. Earth’s inner core is said to be roughly 5,000 kilometers below its surface. It is like an ‘Earth inside an Earth’ and can rotate freely in an outer core made of liquid metal, according to an AFP report. However, how the Earth’s inner core rotates and how its direction changes is a matter of debate among scientists and the latest research proving controversial cannot be denied.
Around 2009, there was a break in the inner core of the earth – research
Much of what is known about the Earth’s inner core has come from measuring the difference in seismic waves produced by earthquakes and, sometimes, nuclear explosions. It (waves) passes through the center of the earth. Seismic waves generated by earthquakes spanning six decades have been analyzed to track the dynamics of the inner core, published in the journal Nature Geoscience. According to the paper’s authors, Xiao Dong and Yi Yang, from Peking University in China, they found that the rotation of the inner core ‘almost stopped around 2009 and then started rotating in the opposite direction’.
No information about the effect on the surface of the earth – researchers
‘We believe that the inner core rotates, relative to the Earth’s surface, back and forth, like a seesaw,’ he told the agency. ‘One cycle of rotation is about 7 decades..’ Meaning, according to them, roughly every 35 years its direction of rotation changes. They say that earlier its direction of rotation had changed in the 1970s and now it is estimated that it will change in the mid-2040s. However, not much is yet known about how much of the Earth’s surface is affected by changes in the inner core. Well researchers believe that there is a real connection with all the layers of the earth, from the inner core to its surface.
What questions are arising on the conclusion of this research?
The researchers have said that ‘we are sure that our research can inspire some researchers to create and test such models, which consider the whole Earth as an integrated dynamic system.’ However, experts not associated with the research are cautious about its conclusions. He says that there are many more theories and is also warning that there are still many mysteries about the center of the Earth. For example, John Vidale, a seismologist in Southern California, has said, “It’s very careful research by the best scientists based on a lot of data…” Does not explain in detail.
Different results in different research
Vidale published his research last year, in which according to him the Earth’s inner core oscillates more rapidly and changes its direction approximately every 6 years. His research was based on seismic waves generated by two nuclear explosions in the late 1960s and early 1970s. The time of the last change of direction in both research is almost the same, which Vidale is calling ‘a mere coincidence’. There is another theory, which Vidale says is based on good facts. According to this, the interior of the Earth had moved very fast between 2001 and 2013 and has been quiet since then.
Also read- When and how does an earthquake occur? know the whole thing behind it
Why are all the results considered controversial?
At the same time, a research has been published by geophysicist Hervoje Tkalsik of the National University of Australia, which states that each cycle of the Earth’s inner center is 20 to 30 years, whereas, in new research, it has been described as 70 years. He has said that ‘all these mathematical models are more likely to be wrong, because they are based on the analysis of the observed data, and not on the data collected as needed.’ ‘Therefore the geophysical community will be divided on these findings and the subject will remain controversial.'(Photos – Indicative)