(source : ANI) ( Photo Credit : ani)
Scientists have spotted a rare geological shift deep inside Earth, right at the boundary between the planet’s core and mantle. This discovery comes from satellite data that picked up an odd tweak in Earth’s gravitational field between 2006 and 2008.
The shift only showed up recently when researchers dug into old data from the GRACE satellites—a pair of U.S.-German spacecraft that tracked gravity changes from 2002 to 2017. These twins flew side by side, measuring tiny shifts in the distance between them to map out Earth’s gravity variations.
What caught everyone’s attention? A strong signal around 2007 off Africa’s Atlantic coast. It didn’t match any surface changes like water or ice movements, which GRACE often monitors. Instead, experts think something deeper happened: rocks near the core-mantle boundary got denser.
Picture this: Under insane pressure down there, a common mineral called perovskite in those rocks might have reshaped itself. That could have sparked a ripple effect, deforming the core-mantle boundary by about 10 centimeters. And get this—it lines up with weird magnetic anomalies recorded in the same spot back in 2007.
The study, out now in Geophysical Research Letters, suggests this kind of shift could link Earth’s layers in ways that affect big stuff like earthquakes and the planet’s magnetic field. It’s a fresh clue to how our world ticks from the inside out.
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