World's largest volcano lurks beneath Pacific Ocean

The dormant behemoth may rival ones on Mars

By Jessica Shugart, 09:43 AM September 6, 2013

The most massive volcano in the world, with a footprint the size of New Mexico, crouches in the dark depths of the western Pacific Ocean. With its hollowed peak lying beneath 2 kilometers of water, Tamu Massif, a basaltic mound, may rival the largest known volcano in the solar system: Mars’ Olympus Mons.

A team led by oceanographer William Sager then of Texas A&M University bounced sound waves off the deep-sea mountain to measure its size.

The researchers report online September 5 in Nature Geo...

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