As the Ice Melts

As the North and South poles melt there is a slow but in the long run very great change in weight distribution as that water melts and becomes either a part of the ocean or eventually evaporates and comes down other places as rain.

If you fill a bucket with water and then lift that bucket and then multiply how many potential buckets of water are (or were) ice and of how that has changed the weight distribution on earth, then you know that the earths rotation is affected by these changes. And you know something has to give.

If, for example you took a toy top and glued something on top and on the bottom of the top you might get some idea of this. One might even put water on top of or on the bottom of a top and then freeze it in the refrigerator and then observe what happens to the top as the ice melted. You either could see the difference or not as it melts. Either way the earth is like a top and just getting used to seeing the earth this way might be a good thing for everyone.

However, if you are a scientist with the right instruments you would be able to calculate the difference in spin and rotation and what changes might result from the loss of this much weight at the poles in regard to rotation. This also might affect the ring of fire and earthquakes and volcanoes.

I guess my questions are: "What is the trigger point or tipping point for aberrant spins or wobbles of earth and what is the tipping point for earthquakes and volcanoes, and what is the tipping point for flooding, droughts, winds and increased weather variations?