Cobb hotspot

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The Cobb hotspot is shown as 5 on map.

The Cobb hotspot is a volcanic hotspot located 460 km (290 mi) west of North America in the Pacific Ocean. The hotspot is at the Juan de Fuca Ridge, and has made the Cobb-Eickelberg Seamount chain. The Axial Seamount is the hotspot's most recent eruptive center, which last erupted in 1998.[1]

The central ridge is thicker than the surrounding crust by one to two km and may be accumulated buildup from the hotspot, which is essentially an underwater volcano with a root twenty to forty kilometers in diameter reaching a depth of 11 kilometres (6.8 mi) beneath the volcano. The magma flows at rate of 0.3 to 0.8 m³/s. The caldera is 1,450 metres (4,760 ft) below sea level.[2][3]

See also[edit]


  1. ^ J. Chadwick; M. Perfit; B. Embley; I. Ridley; I. Jonasson; S. Merle (December 2001). "Geochemical and Tectonic Effects of the Interaction of the Cobb Hotspot and the Juan de Fuca Ridge". American Geophysical Union, Fall Meeting 2001, abstract #T31D-02. Retrieved 2008-11-19. 
  2. ^ Michael West; William Menke; Maya Tolstoy (February 2003). "Focused magma supply at the intersection of the Cobb hotspot and Juan de Fuca ridge" (PDF). Retrieved 2008-11-19. 
  3. ^

Coordinates: 46°00′N 130°00′W / 46.0°N 130.0°W / 46.0; -130.0