About two-thirds of the way across the Pacific we will cross the submerged, northern extension of the Hawaiian islands, called the Hawaiian-Emperor seamount chain. The Hawaiian islands are an above sea level expression of a
chain of seamounts, which includes Midway and Wake Islands.
Notice the active volcanic islands that form Hawaii extend to the northwest (upper left corner) and become a chain on underwater seamounts, marking submerged, inactive volcanoes.
Only the big island exhibits active volcanoes on land in
this chain, but a new volcanic seamount, Loihi, is being formed at present and at some
point in the future will likely rise above the sea.