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Are earthquakes associated with variations in the geomagnetic field?

Electro-magnetic variations have been observed after earthquakes, but despite decades of work, there is no convincing evidence of electro-magnetic precursors to earthquakes. It is worth acknowledging that geophysicists would actually love to demonstrate the reality of such precursors, especially if they could be used for reliably predicting earthquakes!

Tags: Geomagnetism, Magnetic Field, Monitoring, Sun, Core, Declination, Polarity