Three quarters of all of the volcanic activity on Earth takes place at mid-ocean spreading centers,” said Deb Kelley, a ...

The 50-kilometer-wide seamount contains three dormant volcanoes, the floor of which drops more than two kilometers below the ...

Trifonenko/Getty The same as land volcanoes, underwater volcanoes either form by tectonic plates colliding, or a volcanic eruption. Underwater volcanoes are also known as seamounts. Seamounts are ...

The volcano is thousands of feet below the ocean’s surface, so it poses no danger to people. But under all that water, a dramatic eruption is brewing.

The Kamaʻehuakanaloa seamount is an active, underwater volcano that lies 22 miles off Hawaii's southeast coast. Its summit is about 3,200 feet below sea level. Seamounts are large landforms that ...

A submarine volcano 300 miles off the coast of Oregon could erupt for the first time since 2015, spewing “very fluid lava” into the sea where scientists were recently recording more than 1,000 ...

“This paper attributes the breakup to the subduction of the Samoan Seamount Chain.” Samoa, like Hawaii, is part of a linear chain of volcanic seamounts formed as the oceanic crust moves over a ...

"The majority of seamounts around the world — and there are many thousands of them — are formed as undersea volcanoes. This one looks like it would have formed as an underwater volcano because ...

Related: Did the Tonga undersea volcano eruption cause this year's extreme heat? When a tectonic plate slips, or subducts, beneath another plate, the seamounts peppered across its surface scrape ...

Samoa, like Hawaii, is part of a linear chain of volcanic seamounts formed as the oceanic crust moves over a "hotspot" in the Earth's mantle, causing a series of volcanoes to grow over that spot.