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A chain of undersea volcanoes, also known as seamounts. (NOAA Ocean Exploration) Less than one-quarter of Earth's entire ocean floor has been mapped, leaving gaping holes in our understanding of the underwater realm. Accidents await in the void: undiscovered seamounts – ancient mountains formed by volcanic activity – can rise thousands of meters in the darkness, putting unsuspecting submarines at risk. Led by earth scientist Julie Gevorgian of the Scripps Institution of Oceanography in California, a team of scientists has just discovered more than 19,000 new seamounts using a new batch of satellite data. That so many underwater peaks have...

A coalition of commercial fishing groups filed a lawsuit on Tuesday to challenge the creation of a national monument off the coast of New England. President Barack Obama created the monument in September using executive authority under the Antiquities Act. The monument is called the Northeast Canyons and Seamounts Marine National Monument, and it is made up of nearly 5,000 square miles of underwater canyons and mountains. The creation of the monument closed the area to most commercial fishing and has been opposed by fishing groups for months. A coalition of the groups filed their lawsuit Tuesday in federal court....

Thousand of new volcanoes revealed beneath the waves 10:04 09 July 2007 NewScientist.com news service Catherine Brahic The true extent to which the ocean bed is dotted with volcanoes has been revealed by researchers who have counted 201,055 underwater cones. This is over 10 times more than have been found before. The team estimates that in total there could be about 3 million submarine volcanoes, 39,000 of which rise more than 1000 metres over the sea bed. "The distribution of underwater volcanoes tells us something about what is happening in the centre of the Earth," says John Hillier of the...

An undersea volcano about 300 miles (480 km) off Oregon's coast has been spewing lava for the past seven days, confirming forecasts made last fall and giving researchers unique insight into a hidden ocean hot spot, a scientist said on Friday. Researchers know of two previous eruptions by the volcano, dubbed "Axial Seamount" for its location along the axis of an underwater mountain ridge, Oregon State University geologist Bill Chadwick said on Friday. But those 1998 and 2011 eruptions were detected months or years afterward, Chadwick added. Last year, researchers connected monitoring gear to an undersea cable that, for the...