View source for Phreatic

==English==
[[File:Phreatic St. Helens.jpg|right|thumb|A '''phreatic''' eruption (Mount St. Helens, 1980)]]

===Etymology===
{{root|en|ine-pro|*bʰrewh₁-}}
From {{der|en|grc|-}} stem of {{m|grc|φρέαρ|t=well, spring}}.
{{wikipedia}}

===Pronunciation===
* {{IPA|en|/fɹiˈæt.ɪk/}}

===Adjective===
{{en-adj}}

# {{lb|en|geology}} Of or pertaining to [[ground water]]; {{lb|en|volcanology}} involving explosively rapid heating of ground water by [[magma]].
#* '''1979''' [McGraw-Hill], Jacob Bear, ''Hydraulics of Groundwater'', 2007, Dover, [https://books.google.com.au/books?id=yQogKirZW-MC&pg=PA76&dq=%22phreatic%22&hl=en&sa=X&ved=0ahUKEwj54eSooMHcAhUN-J8KHSFpC74Q6AEIdDAQ#v=onepage&q=%22phreatic%22&f=false page 76],
#*: Both <math>\phi</math> 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, [https://books.google.com.au/books?id=9og-r71PymgC&pg=PA143&dq=%22phreatic%22&hl=en&sa=X&ved=0ahUKEwj54eSooMHcAhUN-J8KHSFpC74Q6AEInwIwMQ#v=onepage&q=%22phreatic%22&f=false 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.
#* {{quote-book|en|year=1992|author=Angel Ginés; Joaquin Ginés|chapter=Karst Phenomena and Biospeleological Environments|editor=Ana Isabel Camacho|title=The Natural History of Biospeleology|publisher={{w|Spanish National Research Council|Consejo Superior de Investigaciones Cientificas}}|pageurl=https://books.google.com.au/books?id=wL37QipAYPwC&pg=PA43&dq=%22phreatic%22&hl=en&sa=X&ved=0ahUKEwj54eSooMHcAhUN-J8KHSFpC74Q6AEIfzAS#v=onepage&q=%22phreatic%22&f=false|page=43
|passage=Gradually, infiltrating waters gather in underground rivers or '''phreatic''' conduits well integrated in the karst drainage system, which leads the underground waters to the outlets.}}
#* {{quote-book|en|year=2010|author=Jose Collazo|title=God Does Exist, No More Nuclear Testing and More|pageurl=https://books.google.com.au/books?id=wclSAAAAQBAJ&pg=PA58&dq=%22phreatic%22&hl=en&sa=X&ved=0ahUKEwj54eSooMHcAhUN-J8KHSFpC74Q6AEIpAIwMg#v=onepage&q=%22phreatic%22&f=false|page=58|publisher=Xlibris
|passage=“'''Phreatic'''” (or steam-blast) eruptions are driven by explosive expanding steam resulting from cold ground or surface water coming into contact with hot rock or magma. The distinguishing feature of '''phreatic''' explosions is that they only blast out fragments of preexisting solid rock from the volcanic conduit; no new magma is erupted.}}

====Derived terms====
{{col4|en|phreatic cycle|phreatic eruption|phreatic gas|phreatic line|phreatic surface|phreatic water}}

====Translations====
{{trans-top|Of, or pertaining to ground water}}
* Catalan: {{t|ca|freàtic}}
* Finnish: {{t+|fi|pohjavesi|alt=pohjavesi-}}, {{t|fi|pohjaveden|alt=pohjaveden-}}, {{t|fi|freaattinen}}
* French: {{t+|fr|phréatique}}
* German: {{t|de|phreatisch}}
* Italian: {{t+|it|freatico}}
* Portuguese: {{t+|pt|freático}}
* Romanian: {{t+|ro|freatic}}
* Spanish: {{t|es|freático}}
{{trans-bottom}}

{{trans-top|Eruption / explosion caused by contact between groundwater and high-temperature material}}
* Chinese:
*: Mandarin: {{t|cmn|潜水蒸气喷发}}
* French: {{t|fr|éruption phréatique|f}}
* German: {{t|de|phreatische Explosion|f}}
* Japanese: {{t|ja|水蒸気爆発|tr=すいじょうきばくはつ, suijōki bakuhatsu}}
* Korean: {{t|ko|수증기 분화}}
* Russian: {{t|ru|фреатический взрыв|m}}
* Spanish: {{t|es|erupción freática|f}}
{{trans-bottom}}

===Further reading===
* {{pedia|Phreatic eruption}}
* {{pedia|Phreatic line}}
* {{pedia|Phreatic zone}}

===Anagrams===
* {{anagrams|en|a=acehiprt|chapiter|patchier|pie chart|piechart}}