With monstrous plumes bursting from the water and shimmery streaks of electric light, Devon Massyn said it was one of the craziest things he has ever experienced.

A new video from Japan’s maritime authorities captures an underwater volcano bursting through the sea surface in a violent plume of ash, steam and rock, turning a patch of open ocean into a churning ...

Hidden in the Pacific, two very different volcanoes are forcing scientists to rethink what counts as “biggest.” Tamu Massif, ...