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A seamount is a large submarine landform that rises from the ocean floor without reaching the water surface (), and thus is not an island, islet, or cliff-rock.Seamounts are typically formed from extinct volcanoes that rise abruptly and are usually found rising from the seafloor to 1,000–4,000 m (3,300–13,100 ft) in height.
Axial Seamount is the youngest volcano and current eruptive center of the Cobb–Eickelberg Seamount chain, a chain of seamounts that terminates south of Alaska. [5] Axial lies where the chain intersects with the Juan de Fuca Ridge, [6] approximately 480 km (298 mi) west of Oregon.
A list of active and extinct submarine volcanoes and seamounts located under the world's oceans. There are estimated to be 40,000 to 55,000 seamounts in the global oceans. [ 1 ] Almost all are not well-mapped and many may not have been identified at all.
A seamount is an underwater volcano; Davidson rises 7,480 ft (2,280 m) above the surrounding ocean floor. Although there are over 30,000 seamounts in the Pacific Ocean alone, only about 0.1% of them have been explored. [4] The aqueous environment of the seamount means that it behaves differently from volcanoes on land.
Kamaʻehuakanaloa Seamount [6] (previously known as Lōʻihi) is an active submarine volcano about 22 mi (35 km) off the southeast coast of the island of Hawaii. [7] The top of the seamount is about 3,200 ft (975 m) below sea level.
The New England Seamounts is a chain of over twenty underwater extinct volcanic mountains known as seamounts. [1] This chain is located off the coast of Massachusetts in the Atlantic Ocean and extends over 1,000 kilometers (600 mi) from the edge of Georges Bank. Many of the peaks of these mountains rise over 4,000 meters (13,000 ft) from the ...
Ruby Seamount is a stratovolcano with a more shallow southern peak, [5] and is part of the nine volcano Southern Seamount Province of the Mariana Arc, in the Izu–Bonin–Mariana Arc. [3]: 151 Its location is consistent with it being a back-arc extension associated volcano.
The submarine volcano is a Pleistocene-Recent shield volcano within the Bransfield Basin.The volcano has a base diameter of 20 km, and a height of 1000 m. [7] Samples obtained from Orca seamount were identified as basalt and basaltic andesites, suggesting the existence of more differentiated products, such as dacites or rhyolites.