Research results that 'an unknown structure may exist in the inner core of the earth'


Shea Huening

The earth has a structure in which several layers are stacked, and is called the crust , mantle (upper mantle, lower mantle) , outer core, and inner core from the outside. A new peer-reviewed journal, Journal of Geophysical Research , suggests that the inner core of the Earth may have previously unknown structures.

Evidence for the Innermost Inner Core: Robust Parameter Search for Radially Varying Anisotropy Using the Neighborhood Algorithm --Stephenson --2021 --Journal of Geophysical Research: Solid Earth --Wiley Online Library

Scientists dig deep to reveal Earth's hidden layer --ANU

Scientists Detect Signs of a Hidden Structure Inside Earth's Core

Scientific understanding of the internal structure under the crust includes observation of topography and seafloor, observation of rocks exposed on the surface, investigation of magma that has come out to the surface due to volcanic activity, analysis of seismic waves transmitted through the internal structure, and gravity. It is based on research such as measurement of magnetic field and magnetic field. 'We have been taught that the Earth has four main layers: the crust, the mantle, the outer core, and the inner core,' said Joan Stephenson, a geophysicist at the Australian National University.

Persevering indirect observations suggest that these layers are almost certain to exist, and the inner core, located 5100-6400 km underground, is about the size of the Moon, with temperatures above 5000 degrees Celsius. I also know that it will reach. Studies have shown that the extremely hot inner core remains solid without melting due to a special atomic diffusion pattern.

Why doesn't the Earth's inner core, which is hotter than the Sun, melt? --GIGAZINE

By Mark Rain

Stevenson's research team focused on observational data on the time it takes for seismic waves to pass through the Earth, collected by the International Seismological Center for decades, to investigate the more accurate structure of the inner core. It is said that this data was collated with thousands of patterns of the inner core structural model using a search algorithm.

Analysis of changes in the characteristics of seismic waves passing through the inner core revealed that it is highly possible that the structure of the inner core has changed around 5800 km underground. 'We have found evidence that may indicate changes in the structure of iron in the inner core, which probably suggests that two cooling events have occurred separately in Earth's history.' , Stevenson said.

The study may explain why some experimental evidence contradicts previous Earth's sphere models, although certainty was limited by the number of earthquakes observed and the placement of receivers. That thing. 'The results are very exciting, and we may have to rewrite our textbooks,' said Stephenson.

in Science, Posted by log1h_ik