“More” to the “core” of inner part of the Earth – Study reveals the mysteryMd Noman Siddique (Author) Published Date : Feb 11, 2015 09:21 IST
Scientists from the United China States and are saying they have found new insight on what really exists at the core of our planet suggesting that there could be another distinctive region in there.
According to the journal Nature Geoscience, the reason behind this is that the pattern of the iron crystals in is not similar to the ones discovered in the exterior of the inner core.
Scientists are using echoes caused by earthquakes to examine the core by assessing the way they alter while passing through the various layers.
Prof Xiaodong Song of the University of Illinois at Urbana-Champaign said: The waves are bouncing back and forth from one side of the Earth to the other side of the Earth.
Prof Song and his team in China states that this data is suggesting that the Earth s inner core consists of two parts.
When looking at Earth from the North Pole, the seismic wave data proposes that the alignment of the crystals in this new found inner core is directed in an east-to-west pattern whereas the ones on the outer part of this core are aligned in a vertical (north-south) pattern.
Prof Song said: The fact we are discovering different structures at different regions of the inner core can tell us something about the very long history of the Earth.
The Earth s core lies 5,000km deep from and began solidifying about a billion years ago while continuing to grow around 0.5mm annually.
This fresh new insight of the diverse patter proposes that they structured in varied circumstances and that Earth might have gone through a vivid change in that era.
Prof Simon Redfern from the University of Cambridge said: Probing deeper into the solid inner core is like tracing it back in time, to the beginnings of its formation.
People have noticed differences in the way seismic waves travel through the outer parts of the inner core and its innermost reaches before, but never before have they suggested that the alignment of crystalline iron that makes up this region is completely askew compared to the outermost parts.
If this is true, it would imply that something very substantial happened to flip the orientation of the core to turn the alignment of crystals in the inner core north-south as is seen today in its outer parts.
He also said that other research proposed that Earth s magnetic field might have gone through changes approximately 500 million years ago swapping between the equatorial axes and the polar axis.
It could be that the strange alignment Prof Song sees in the innermost core explains the strange palaeomagnetic signatures from ancient rocks that may have been present near the equator half a billion years ago, he added.
For the moment, however, the model proposed in this paper needs testing against other ways of analysing the seismic properties of Earth's innermost core, since no other researchers have previously considered evidence for the same conclusions in their studies.
“More” to the “core” of inner part of the Earth – Study reveals the mystery