Axial is the world’s most extensively studied undersea volcano because more than 660 miles of undersea cables crisscross it, ...

Here's what to know. A 3D bathymetric map showing the shape and summit caldera of the Axial seamount, 300 miles off Oregon's coast. Warm colors indicate shallower depths, cool colors are deeper.

A massive underwater volcano close to the US coast is on the brink of erupting after 2,000 earthquakes were recorded in just ...