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The Sun's magnetic north pole, which was in the northern hemisphere just a few months ago, now points south. It's a topsy-turvy situation, but not an unexpected one.
Causes and effects
Glacial cycles: redistribution of ice and water masses, and resultant deformation of the crust, changes the mass distribution around the Earth.
Perturbations of the topography of the core-mantle boundary, perhaps induced by differential core rotation and shift of its axial rotation vector, leading to CMB mass redistributions.
Mass redistributions in the mantle.
The orientation of the rotational axis itself could be changed by high-velocity impact of a massive asteroid or comet.
On the other hand, people believe pole shift is gradual because it is. Along with dramatic pole shift there is also plenty of evidence supporting the fact that our poles are always moving, Polar Wander.
Well they have definitely found frozen animals with undigested tropical plants in their stomachs - so that implies a very fast and dramatic freezing. Quite possibly the result of a physical polar shift.
Originally posted by fasteronfire
Thanks for your post.
First I think we need to look at the fact that yes pole shifts can occur very dramatically and rapidly but they can also occur gradually with less threatening results. As a race we have never seen a dramatic pole reversal, dubbed the "Cataclysmic Pole Shift"
Causes and effects
Glacial cycles: redistribution of ice and water masses, and resultant deformation of the crust, changes the mass distribution around the Earth.
Perturbations of the topography of the core-mantle boundary, perhaps induced by differential core rotation and shift of its axial rotation vector, leading to CMB mass redistributions.
Mass redistributions in the mantle.
The orientation of the rotational axis itself could be changed by high-velocity impact of a massive asteroid or comet.
Therefore we can only speculate and hypothesize about what could really happen. I do agree that there is evidence of this happening in the past, I also agree that current events on our planet could be pointing to a coming pole reversal.
On the other hand, people believe pole shift is gradual because it is. Along with dramatic pole shift there is also plenty of evidence supporting the fact that our poles are always moving, Polar Wander. It's easier for us to comprehend a gradual pole shift because we've been seeing it happen since our existence began and it's never posed much of an immediate threat.
It is my personal belief that a gradual pole shift and a cataclysmic pole shift occur hand in hand and we just haven't had the time as a species to see the bigger picture about our planet and the influence of other celestial bodies on it.
Originally posted by SunnyDee
reply to post by pajoly
...
Guess we should keep an eye on the elite for the next few weeks, but what would we do anyway, nowhere to hide in this situation.