The Earth has an Even More Inner Core, and it's a Ball of Solid Metal universetoday storybywill
Artist’s impression of Earth’s interior structure. Credit: Argonne National Labs
Anisotropy measurements of Earth’s inner core based on these waves’ travel times revealed previously-unrecorded data about Earth’s interior structure. This included the possible presence of a layered structure in the innermost part of the inner core. “The existence of an internal metallic ball within the inner core, the innermost inner core, was hypothesized about 20 years ago,” said Dr.
According to the team, these findings might explain how waves speed up or slow down depending on their angle of entry as they penetrate the innermost inner core. Said Dr. Pham: “By developing a technique to boost the signals recorded by densely populated seismograph networks, we observed, for the first time, seismic waves that bounce back -and forth up to five times along the Earth’s diameter. Previous studies have documented only a single antipodal bounce. The findings are exciting because they provide a new way to probe the Earth’s inner core and its centremost region.
“This inner core is like a time capsule of Earth’s evolutionary history – it’s a fossilized record that serves as a gateway into the events of our planet’s past. Events that happened on Earth hundreds of millions to billions of years ago. There are still many unanswered questions about the Earth’s innermost inner core, which could hold the secrets to piecing together the mystery of our planet’s formation.
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