Kamchatka. The bend in the Emperor seamount chain reflects a change in plate motion about 40 million years ago.
This is a map of the "geoid" in the vicinity of Hawai'i. If the Earth were all water, or at least if you cut a bunch of canals through the continents so that water could flow freely between the oceans, the geoid would be the surface of that water. This imaginary body of water (the geoid) reacts to the force of gravity, which is not constant everywhere on Earth. Where the force of gravity is stronger more water will be attracted and flow into the area making the geoid height higher. Areas with lower gravity will be the places that give up this water and there the geoid height will be lower. In Hawai'i, however, there is no need to have an imaginary surface of water because we're surrounded by the Pacific Ocean.