Earthquakes during the pole shift occur when plates are on the move, the jolts felt when the plate moves, and shortly thereafter when the surrounding plates adjust to the new tension. Aftershocks are such adjustments, and are always minuscule compared to the major plate movement. During the pole shift all plates on earth on the move, and the jolt occurs at the sudden stop when the crust stops moving. This is when the Richter 9 equivalent earthquakes, which we have termed Richter 15 as the scope is far larger than Richter 9, will be felt worldwide.
The earthquakes following the pole shift will be no more wrenching than earthquakes due to plates adjustments under normal circumstances. The moving plates, suddenly slamming into each other as they start to slow down, will create a domino effect not unlike a multiple car crash. One plate slams into another as the first plates slows down, creating a domino effect that rapidly ricochets around the world, within minutes. There is no delay in this motion, as each plate is solid and what affect one edge affects the far edge, when the entire plate is in motion. Thus, the earthquakes come all at once, and rapidly settle down to an adjustment phase, within minutes.
Due to the immensity of the adjustment, with many plates in barely tenable positions, there will be many aftershocks, most occurring within the first few weeks. These will range from Richter 8 on down, but in no case will be as great as the initial shock during the pole shift. They will rapidly diminish, reduced to annoying tremors after a few weeks.