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

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 ...

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

What’s next? Lava is erupting from several volcanoes, including one in Hawaii. Nearly 50 volcanic eruptions have been recorded this year, and more are expected. The Axial Seamount, an underwater ...

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 ...

"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 ...

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 ...

“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 ...

Charlotte Lytton and Matthew Abbott traveled to Tonga to report this story. All photographs were made in May 2023. Sept. 1 at 6:00 a.m. Warning: This graphic requires ...

There are volcanic arcs in the Andes of South America ... a much younger crust began to reach what is now Costa Rica, with the Galapagos seamounts—submerged oceanic islands in the Pacific ...

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.