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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. They are defined by oceanographers as independent features that rise to at least 1,000 m (3,281 ft) above the seafloor, characteristically of conical form. [1]
The Hawaiian–Emperor seamount chain is a mostly undersea mountain range in the Pacific Ocean that reaches above sea level in Hawaii.It is composed of the Hawaiian ridge, consisting of the islands of the Hawaiian chain northwest to Kure Atoll, and the Emperor Seamounts: together they form a vast underwater mountain region of islands and intervening seamounts, atolls, shallows, banks and reefs ...
There are thought to be up to an estimated 50,000 seamounts in the Pacific basin. [8] The Hawaiian–Emperor seamount chain is an excellent example of an entire volcanic chain undergoing this process, from active volcanism, to coral reef growth, to atoll formation, to subsidence of the islands and becoming guyots.
Over a period of 80–100 million years, the sea floor under Hawaii moved from the East Pacific Rise to its present location 3,700 mi (6,000 km) west, carrying ancient seamounts with it. When scientists investigated a series of earthquakes off Hawaii in 1970, they discovered that Kamaʻehuakanaloa was an active member of the Hawaiian–Emperor ...
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 ...
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. They are defined by oceanographers as independent features that rise to at least 1,000 m (3,281 ft) above the seafloor, characteristically of conical form.
Axial Seamount's growth has intersected the growth of many of the smaller seamounts around it. The largest of these is Brown Bear Seamount, to which it is connected [8] by a narrow ridge running roughly perpendicular to its western caldera wall. However, little evidence of interactions between the two seamounts has been found. [6]
The seamounts reach heights of 1–1.4 kilometres (0.62–0.87 mi) and have summit craters/calderas, [2] that on "DTD", "MOK" and "NEW" form nested, complex calderas. [7] Horseshoe-shaped volcanic ridges accompany the calderas and lava effusion appears to have preferentially occurred on the margins of the calderas, along with mass wasting . [ 8 ]