Confirmed: the Earth's inner core is solid
A new study by researchers from the Australian National University (ANU) can help us understand how our planet formed. Associate Professor Hrvoje Tkalchich and PhD Than- Son Pham sure that proved that the Earth's inner core is solid. They found a way to detect shear waves (J-waves) in the inner core - this kind is only through solid objects can move waves.
"We found that the inner core is really hard, but it is softer than previously thought," says Tkalchich.
"If it turns out that our results are correct - the inner core will have some elastic properties similar to those of gold and platinum. The inner core - it's a time capsule If we understand it, we will understand how the planet formed and evolved. "
What it is in the center of the Earth?
Internal shear waves are so small and weak that they can not be observed directly. Their detection is considered the "Holy Grail" of the world of seismology, for the first time, scientists predicted the existence of a solid inner core is still in the 30-40 years of the last century. So you have to be resourceful to find them.
Their method of correlating the wave field is looking for similarities between the signals from the two receivers after a major earthquake, and not with the direct waves revenues. A similar technique was used to measure the thickness of ice in Antarctica.
"We reject the first three hours gather and look at what is happening between three and ten hours after the earthquake. We want to get rid of large signals. Using a global network of stations, we take every single pair of receivers and every single big earthquake - the combinations are many - and measure the similarity between the seismograms. This cross-correlation, or the measurement of similarity. These similarities, we are creating a global correlogram - cast of the earth. "
Results of scientists have shown that the Earth's inner core - the very center of the planet - is really hard, but many are still unknown variables - such as temperature.
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