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About 780 000 years ago was when the earth's magnetic field last flipped.

In summer 1960-61, a USARP party led by Franz van der Hoeven, left Scott Base, Antarctica to traverse Victoria Land, the territory lying to the west of the Ross Sea.

In the course of this traverse they found a series of gravity anomalies which inferred a strike of a group of bolides. This has more recently been confirmed by satellite measurement.

The date of this impact is coincident with the last geomagnetic reversal, but no cause-and-effect is yet shown. This area is close to the location of the South Magnetic Pole.

The magnetic field is believed to be caused by electrical currents in the magma, running approximately parallel to the equator. [Or the net sum of a parallel of such currents.]

Slight disturbances in these conductivity paths could easily move the route of the current, thus changing the position of the poles.

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