 It is believed that due to the slowing spreading rates at the southwest rift and the northern end of the east rift, the southwest and west rift will cease spreading activity and completely transfer the microplate from the Nazca to the Pacific Plate.This has been the case for other areas where extensive rift propagation studies have been conducted.Divergence of the Nazca and Pacific plates generate a pulling force acting on the Easter microplate, causing its rotation.