Brunhes–Matuyama reversal

The Brunhes - Matuyama reversal, which was named after Bernard Brunhes and Matuyama Motonori, is a geological event around 780,000 years ago, when the Earth's magnetic umpolte for the last time. This reversal was probably slow and took several thousand years.

Surveys that have been made since 1830 have shown that the strength of the earth's magnetic field has decreased by almost ten per cent, in the last hundred years alone by about six percent. This exceptionally rapid decline could be attributed to the fact that the Earth's magnetic field begins to reverse the polarity again.