Plain language summary
This study explores how changes in the Earth’s gravity field, measured by the Gravity Recovery and Climate Experiment (GRACE) satellites between 2003 and 2015, can help us better understand the deep interior of our planet. These data may bring innovative information on mass redistributions near the boundary between the core and mantle. We detect an unusual gravity signal over the eastern Atlantic in early 2007 that evolved over several months and years. Around the same time, a distinct geomagnetic jerk was observed in the same region using satellite magnetic data. Our results suggest that this gravity signal originates deep within the Earth, near the base of the mantle. We propose that it may reflect rapid mass redistributions linked to a lower mantle mineral phase transition occurring in a thermally varied area at the base of deep mantle plumes, potentially causing dynamic changes in the core-mantle boundary’s shape over a few years.
Possible sign of geomagnetic excursion? I have no idea what this might mean but the information is relevant to the geomagnetic excursion worst-case scenario, and may be of interest to some readers. ABN
American Buddhist Net 