John Seach, Volcano Live

 Water Cupola (Water Dome) - John Seach

A water cupola is a dome formation on the surface of the water just before an underwater eruption breaks through.
The dome may rise to form a cylinder. Cupolas have been observed with a base of 100-200 m and height of 26 m.
 

Water Cupola
www.volcanolive.com
Copyright John Seach