The Single Pendulum bearing maintains constant friction, lateral stiffness, and dynamic period for all levels of earthquake motion and displacements. In the Triple PendulumTM bearing, the three pendulum mechanisms are sequentially activated as the earthquake motions become stronger. The small displacement, high frequency ground motions are absorbed by the low friction and short period inner pendulum. For the stronger Design Level Earthquakes, both the bearing friction and period increase, resulting in lower bearing displacements and lower structure base shears. For the strongest Maximum Credible Earthquakes, both the bearing friction and lateral stiffness increase, reducing the bearing displacement. When designed for a severe Maximum Credible Earthquake, the plan dimensions of the Triple PendulumTM bearing are approximately 60% that of the equivalent Single Pendulum bearing