An explosion on Mount Spurr could generate massive cloud of ash, which could mess with airplanes and cause issues for humans.

The Axial Seamount is one of the most active but least well-known volcanoes in the Pacific and all signs point to it erupting very soon—for the first time in a decade.

A recent study found increased seismicity and swelling at Axial Seamount, suggesting an eruption could occur sometime this year.