Contrary to the fact that the inner core of the earth is solid, researchers from the Australian National University (ANU)…
Contrary to the fact that the inner core of the earth is solid, researchers from the Australian National University (ANU) have found that it is relatively softer.
In a groundbreaking discovery, Professor Hrvoje Tkalcic and PhD Scholar Thanh-Son Pham are sure that the inner core of the earth is solid.
However, Tkalcic said, “We found that the inner core is solid, but we also found it to be softer than previously thought.”
Radius: 1,220 kilometers (760 miles) ie. 70 percent of the moon radius
Consists of: Nickel iron alloy
Temperature: ] 5,700 K (5,430 ° C) or 9806 ° F, which is almost the temperature of Sun [1
9659008] What is the inner core of?
The inner core consists of two layers of outer and inner.
The outer core is 1.355 miles (2.180 km) thick.
There is no estimated radius of the inner nucleus;
The inner core is measured by shear waves, a seismology term that is so small and weak that it can not be observed directly.
The fact is to discover them have been regarded as & # 39; Holy Grail & # 39; of global seismology since researchers predicted the inner core was solid in the 1930’s and 40’s.
According to space .com, when charged particles from the solar wind collide with air molecules over the earth’s magnetic poles, it causes the air molecules to light and cause the aurors – northern and southern lights.
They came up with a way to detect shear waves, or “J waves” in the inner nucleus – a type of wave that can only travel through solid objects.
“It turns out – if our results are correct – The inner core shares some similar elastic properties with gold and platinum. The inner core is like a time capsule, if we understand we understand how the planet was formed and how it develops,” he added.
According to the research published by the university, the wavefield methodology looks at the similarities between the signals of two recipients after a major earthquake, rather than the direct wave uses.
A similar technique has been used by the same layer to measure the thickness of the ice in Antarctica.
“We throw away the first three hours of the seismogram and what we are looking at is between three and 10 hours after a major earthquake happens.” We want to get rid of the big signals, “said Dr. Tkalcic.
“Using a global network of station s, we take each individual pair of recipients and every major earthquake – there are many combinations – and we measure the similarity between seismograms. It is called cross-correlation, or the measure of equality. From these similarities we design a global correlogram – a kind of fingerprint of the earth. “
The study shows that these results can be used to show the existence of J waves and divert the shear wave velocity into the inner nucleus. 19659008] What is the meaning of this method?
Dr Tkalcic says that the inner core of the earth is even more exciting.
“For example, we do not know what exactly the internal core temperature is, what the age of the inner core is or how fast it solidifies, but with these new advances in global seismology we slowly get there,” he added.
He also informed that “the understanding of the inner core of the earth has direct consequences for the generation and maintenance of the geomagnetic field, and without the geomagnetic field, there would be no life on earth’s surface.”
Also read : Thousands of asteroids like whiz across the earth are from ancient, now dead planets
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