Imagine the effects of these two icebergs which are now broken free of the Antarctic ice cap, as they are redistributed, and, alternatively, if they were deposited over high elevation dry land, at height, then melted by global climate changing conditions. As this happens constantly in varying amounts and to excess in periods of cold and heating, we are seeing earthquake adjustments as the masses are traveling across both liquid and 'dry' land.
Elevation changes and mass re-distributions are causing some of the earthquake patterns, as the tectonics blocks are in motion across and over and under the other sections, with the masses and elevations applied and removed by changing climate and land(solids) redistribution in the interactions.
The effects are both climate and movement related, giving compensation a series of timings to match the liquid phase water(solvent) application from the atmosphere, climate alterations, and tectonics motions.
Adding volcanism to the mixture of adjustments, as in the Central and South American regions, and it becomes easier to imagine the spinning Earth's mass controls climate, and additionally, the climate and surface effects control the Earths rotation and axis orientation.
The real power in the engine, is the sea floor spreading mechanism, which provides new replaced, changing, sea floors in the tens to hundreds of millions of years timing, giving a mass movement and powering much of the other aspects of the Earths surface effects.
The redistribution of fresh water and human use can be be seen in the estimate that the two icebergs are approximately one-fifth of the total yearly human use of fresh water by volume(or mass) and the portion of the polar cap total for these two is a tiny fraction of the total solid ice remaining at the caps currently.