The Vance Seamounts are a group of seven submarine volcanoes located west of the Juan de Fuca Ridge.
They are the southernmost of several near-ridge chains located on the Pacific Plate, stemming from the Juan de Fuca Ridge.
[1] Most of the volcanoes have gently sloping plateaus, in conformity with their low shield volcano–like profiles, which have been heavily modified by multiple calderas.
The southeastern volcanoes also have low-level parallel faults arranged linearly against the Juan de Fuca Ridge.
[1] The construction of the cones left a lot of debris scattered across the ocean surface, much of which is aligned parallel to the ridge axis.