phreatomagmatic eruption

GLOSSARY OF VOLCANIC TERMS
A type of explosive volcanic eruption that occurs when water (groundwater or surface water) comes in contact with hot magma. The quenching of the magma by the water causes the magma to violently fragment into juvenile (cognate) particles that are bounded by fracture surfaces and by rounded walls of broken vesicles. Due to the moisture present, accretionary lapilli are also common in volcanic deposits resulting from phreatomagmatic eruptions (Williams and McBirney, 1979, p. 247-248).

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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