An explosive volcanic eruption caused when water and heated volcanic rocks interact to produce a violent expulsion of steam and pulverized rocks. Magma is not involved.
Steam-driven explosion of ash and rock.
A small steam-driven volcanic explosion. The driving force is the flashing of hot water to steam by magmatic heat, but fresh magma itself is not involved.
stearn or hot water eruption, or a combination
A volcanic eruption or explosion of steam, mud or other material that is not incandescent; this form of eruption is caused by the heating and consequent expansion of ground water due to an adjacent igneous heat source.
Phreatic eruptions, also called ultravulcanian eruptions, occur when rising magma makes contact with ground or surface water. The extreme temperature of the magma (anywhere from 600 °C to 1,170 °C (1110–2140 °F)) causes near-instantaneous evaporation to steam resulting in an explosion of steam, water, ash, rock, and volcanic bombs. At Mount St.
