Cobb Seamount
Cobb Seamount is a seamount (underwater volcano) and guyot located 500 km (310 mi) west of Grays Harbor, Washington, United States. Cobb Seamount is one of the seamounts in the Cobb–Eickelberg Seamount chain, a chain of underwater volcanoes created by the Cobb hotspot that terminates near the coast of Alaska. It lies just west of the Cascadia subduction zone, and was discovered in August 1950 by the U.S. Fish and Wildlife Service fisheries research vessel R/V John N. Cobb (FWS 1601). By 1967, over 927 km (576 mi) of soundings and dozens of samples from the seamount had been collected.
| Cobb Seamount | |
|---|---|
| Summit depth | 34 m (112 ft) |
| Height | 2,743 m (8,999 ft) |
| Summit area | 824 km2 (318 sq mi) |
| Location | |
| Coordinates | 46°44′N 130°47′W |
| Geology | |
| Type | Seamount (underwater volcano), guyot |
| Volcanic arc/chain | Cobb–Eickelberg Seamount chain |
| Age of rock | about 3.3 million |
| History | |
| Discovered by | MV John N. Cobb, 1950 |
Cobb Seamount is geologically interesting for its terraced, pinnacle structure, and its biological community. Like many other seamounts, Cobb Seamount acts as a biological center of diversity, and supports a dense oceanic ecosystem. Relatively convenient access and an interesting biological setting have made the seamount an object of several scientific cruises and dives.