Contrary to previous assumptions, Earth's inner core is not a uniform mass but rather resembles a diverse tapestry composed of different 'fabrics.'
In 1936, seismic waves provided the initial evidence that the Earth's inner core was solid. This discovery, made by Danish seismologist Inge Lehmann, challenged the prevailing belief that the entire core was liquid due to its extremely high temperature, reaching around 10,000 degrees Fahrenheit, comparable to the sun's surface temperature.
"The inner core is not the uniform mass that scientists once believed it to be. Instead, it resembles a tapestry composed of different fabrics," said Guanning Pang, the lead author and a former Ph.D. student in the University's Department of Geology and Geophysics, in aThe team tapped into special seismic arrays, including the International Monitoring System , set up worldwide to detect explosions like nuclear blasts.
The new research used seismic data from 20 arrays, including two in Antarctica and one near Utah. These consisted of instruments placed in boreholes drilled up to 10 meters deep in granite formations, arranged in patterns to enhance the signals they capture, similar to parabolic antennae.exceeding magnitude 5.7. By studying how these waves interacted with the Earth's inner core, they were able to map its internal structure.
"Our biggest discovery is that inhomogeneity tends to be stronger when you get deeper. Toward the center of the Earth, it tends to be stronger," highlighted Pang. "We think that this fabric is related to how fast the inner core was growing. A long time ago, the inner core grew really fast. It reached an equilibrium, and then it started to grow much more slowly," said U seismologist Keith Koper, who oversaw the study.The complete study was published in Nature on July 5 and can be found
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