Axial Seamount—the most active volcano in the northeast Pacific Ocean—is located less than 300 miles off the coast of Oregon. It last erupted in 1998, 2011 and 2015. Now, with the seamount's ...

Axial Seamount sits under the Pacific Ocean about 300 miles from the U.S. coast. Since 1997, scientists have kept a careful eye on it using instruments that measure pressure on the ocean floor. Data ...