Earth's Inner Van Allen Belt

[putnam6]

The Van Allen belts are a result of the Earth's core being magnetic.  So they follow the wandering of the poles.

https://spacecenter.org/what-are-the-van...ic%20field.

 
So we could theorize if the poles moved the South American anomaly in the original question would move as well. Or is that anomaly related to some other geologic process?