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Satellite data revealed a sudden gravity shift near Earth’s core-mantle boundary off Africa’s coast, likely due to deep mantle mineral changes.
Scientists detected unexplained changes near Earth’s core-mantle boundary using satellite data from 2006 to 2008, showing a sudden shift in gravity off Africa’s Atlantic coast not linked to surface processes.
Researchers suggest the shift may stem from a structural change in perovskite, a deep mantle mineral, becoming denser under pressure, deforming the boundary by about 10 centimeters and possibly influencing magnetic anomalies observed around 2007.
The findings, based on GRACE mission data and published in Geophysical Research Letters, reveal new insights into Earth’s deep interior dynamics and their potential impact on seismic activity and the planet’s magnetic field, underscoring the importance of long-term satellite observations.
Los datos satelitales revelaron un repentino cambio de gravedad cerca del límite entre el núcleo y el manto de la Tierra frente a la costa de África, probablemente debido a cambios minerales profundos en el manto.