Quote: Originally Posted by Stretch
3 good (by present standards) hits to the earths balance, remember, we already in a wobble, will take a toll...for a spinning top to regain its balance after a "distrubance" requires a firm suface, something to anchor on.......sumpin we lack........... just my thorts
Well, it's a conservation of angular momentum issue.
Keep in mind the earth has a metal core surrounded by liquid rock with a solid crust.
When an earthquake disrupts the crust's axis for a bit, there's an equal and opposite offsetting somewhere else in the sphere, i.e. the core would wobble the opposite way.
After awhile, through forces passed back and forth through the liquid rock mantle, the two cancel each other out and the planet will tend to settle back to where it was.
Where a wobble can turn into a permanent change is if a source of new angular momentum comes from outside, like a big asteroid hitting the planet.
In that case it's a question of what angle and speed the asteroid hits, and at what latitude.
Even then, it tends to be a small shift. Geological evidence indicates that the earths been at about a 23 degree tilt for most of it's history. Small changes have happened for assorted asteroid impacts, but as huge as those impacts might appear to be from the ecosphere's point of view, like when that asteroid smacked out the dinosaurs, in terms of the total mass of the planet, it was a pin-prick.
To get a serious shift of axis you'd have to get hit by something the size of a Galilean moon.
You might be confusing wobble with presses, because yes, the axis does presses, but that's a different effect with a different cause, and yes, sometimes media or some teachers will try to explain the concept of presses by saying it's "like" a wobble.