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Cobb Seamount is ~ 100 km west of the Cobb hot spot, currently feeding Axial Seamount on the Juan de Fuca Ridge. It is ~ 3.3 Ma in age. The flat-topped summit is at a depth of 200-300 m. It was formed when the summit was above sea level. The inset of Cobb is after Chaytor et al., Seamount morphology in the Bowie and Cobb hot spot trails, Gulf of Alaska. Geochem. Geophys. Geosyst., doi:10.1029/2007GC001712. Credit. D.S. Kelley, University of Washington.

Axial Seamount rises to a depth of ~ 1500 m beneath the oceans surface and is cut by the Juan de Fuca Ridge. Transform faults and fracture zones bounding tectonic plates off Vancouver Island south to California. Credit: Center for Environmental Visualization and D. Kelley, University of Washington.

The intermediate spreading Juan de Fuca Ridge hosts multiple segments. A hot spot underlies the ridge beneath Axial Seamount. The Cobb-Eickeberg Seamount chain marks the migration of the Pacific Plate over time. Transform faults and fracture zones bounding tectonic plates off Vancouver Island south to California. Credit: Center for Environmental Visualization and D. Kelley, University of Washington.

Transform faults and fracture zones bounding tectonic plates off Vancouver Island south to California. Credit: Center for Environmental Visualization and D. Kelley, University of Washington.

Tectonic plates off Vancouver Island south to California. Credit: Center for Environmental Visualization and D. Kelley, University of Washington.

Bathymetric map showing the tectonic plates from California north to Vancover Island. Credit: Center for Environmental Visualization and D. Kelley, University of Washington.

A basic bathymetric map centered on the Juan de Fuca Plate. Credit: Credit: Center for Environmental Visualization, UW.

Convection cells beneath mid-ocean ridges (divergent plate boundaries) are sites where melt rises up from the mantle. At convergent plate boundaries the oceanic crust and sediments are subducted beneath the bounding plate. Credit: Center for Environmental Visualization, UW.

A map of seafloor magnetics highlights the mid-ocean ridge spreading center network that forms the longest mountain chain on Earth. Credit: Center for Environmental Visualization, UW.

volcanoes animation slide

The 70,000 km of the mid-ocean ridge spreading centers forms the longest mountain chain on Earth, and is where 75% of the volcanism on our planet occurs. Credit: Center for Environmental Visualization, University of Washington.