[JRandomFreeper]

The magnetic pole is moving much faster these days, and the overall field has weakened 10% since the 19th century. It will be interesting to watch this develop during my lifetime.

/johnny

[Errant]

Yes it is. Last I heard, up to 85 miles per year now. Very interesting times we live in!

[Errant]

Seems to me that something else to consider is the possibility the core periodically becomes out of sync with the mantle, either through precession or some kind of field effect between the sun and the earth or possibly even the galactic plane.

Resulting pressure waves could contribute to increased thermal variations and increased earthquake and volcanic activity on much shorter time frames. It would also explain earthquake cycles and the fact that these cycles encompass earthquakes at all depths.

Just thinkin' out loud here... ;)