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Most reversals take between 1,000 and 10,000 years to happen.

The latest one, the Brunhes–Matuyama reversal, occurred 780,000 years ago; and may have happened very quickly, within a human lifetime.

A brief complete reversal, known as the Laschamp event, occurred only 41,000 years ago during the last glacial period.

Their simulation reproduced key features of the magnetic field over more than 40,000 years of simulated time and the computer-generated field reversed itself. Studies have been done to see if reversals relate in any way to extinction events.

This convection (movement) generates electric currents which in turn give rise to magnetic fields.

In simulations of planetary dynamos, reversals occur from the underlying dynamics.

In general, positive anomalies represent periods when Earth's magnetic field was pointing north as it is today, while negative anomalies represent periods in Earth's history when Earth's magnetic field pointed to the south pole.

The first marine magnetic anomaly based timescale was constructed by Jim Heirtzler and colleagues in 1968.