Mud Volcanoes Gallery

Mud volcanism is the eruption of sediment, not lava. It is caused by the building up of pressure underground that pushes sediment toward the surface. As it moves, the sediment can form dikes and sills underground and mud volcanoes at the surface, analogous to magma dikes and sills and lava volcanoes. This gallery shows each of the four major types of mud volcanism.

More on mud volcanoes