Phreatic

English

A phreatic eruption (Mount St. Helens, 1980)

Etymology

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Pronunciation

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Adjective

1. Template:Lb Of or pertaining to ground water; Template:Lb involving explosively rapid heating of ground water by magma.
   • 1979 [McGraw-Hill], Jacob Bear, Hydraulics of Groundwater, 2007, Dover, page 76,

     Both $\varphi$ and q vary from point to point within a phreatic aquifer.

   • 1981, Peter W. Lipman, James G. Moore, Donald A. Swanson, Bulging of the North Flank Before the May 18 Eruption—Geodetic Data, Peter W. Lipman, Donal R. Mullineaux (editors), The 1980 Eruptions of Mount St. Helens, Washington, U.S. Geological Survey, page 143,

     These results contributed to assessments by USGS personnel in late April and early May that Mount St. Helens remained highly dangerous despite the seemingly mild small-scale phreatic eruptions that were then the most conspicuous activity.

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