Electro-magnetic variations have been observed after earthquakes, but despite decades of work, there is no convincing evidence of electro-magnetic precursors to earthquakes.
We generally emphasize the following four points:
Why don't the elevations on your maps agree with those provided by my GPS system? Which ones are correct?
The USGS publishes approximately 57,000 different topographic maps covering the United States.
Could magnetic reversals be caused by meteorite impacts, comet impacts, melting ice caps, or planetary alignments?
No. There is no evidence of a correlation between mass extinctions and magnetic pole reversals.
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