"As detailed in a paper published in the journal Geophysical Research Letter s last month, a team led by Paris City University researcher Charlotte Gaugne Gouranton analyzed data collected by NASA's Gravity Recovery and Climate Experiment (GRACE) satellites between 2006 and 2008. The two satelliteswere designed to monitor changes in the planet's underground water storage and sea levels, per NASA. But the findings by Gouranton's team suggest they were able to probe far deeper than that."
"In their paper, the team proposes that perovskite, a type of mineral found at the bottom of Earth's mantle, may have changed the layer's structural configuration, causing rocks in the vicinity to become denser and increase in mass. These perturbations sent out ripples that could've reached the boundary of the Earth's core. These changes also could've altered the way liquid rock flows inside the Earth's outer core, resulting in strange geomagnetic readings in GRACE data."
NASA GRACE satellite data from 2006–2008 reveal a mass redistribution deep within Earth near the core–mantle boundary. Minute gravitational-field shifts indicate material thousands of miles down moved, producing a localized densification and mass increase. Perovskite at the base of the mantle may have altered its structural configuration, sending perturbations toward the core boundary. Those perturbations could have changed outer-core liquid flow and produced anomalous geomagnetic readings, including a geomagnetic jerk that peaked around 2007 off Africa. Groundwater shifts could not fully account for the signal, implying a solid-Earth origin with implications for Earth's magnetic shielding.
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