from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or relating to ground water.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of or pertaining to ground water
from the GNU version of the Collaborative International Dictionary of English
- adj. Subterranean; -- applied to sources supplying wells.
from The Century Dictionary and Cyclopedia
- Subterranean, as the sources of wells.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. of or relating to ground water
So in this telling, it was what geologists call a phreatic, or steam-powered flash explosion, that caused such headaches for the travel industry.
Now throw in singular events such as phreatic volcanic eruptions, which can measurably affect global temperatures for up to 10 years and you have a detection of overlappping causes problem of monumental proportions.
No magmatic eruptions have occurred since the late Pleistocene, but large phreatic eruptions took place near Yellowstone Lake during the Holocene.
As it is known, the problem is the phreatic mantle, the technicians ... [changes thought] However, I am told that they are about to find the solution.
Mexico has hydraulic energy which has been affected by suspicious droughts coinciding with certain U.S. experiments related to hurricanes, and which in Mexico, as in Cuba, constitute irreplaceable sources of water for the rivers and for the phreatic mantle.
Jimenez [president of the Cuban National Academy of Sciences] always reminds us that they help to fill the phreatic layer.
That is what it must be; that no a single riverlet, arroyo, river, absolutely nothing remain undammed -- in addition to the use of drainage, the different types and systems of damming, the system for the injection of water in the phreatic mantle, and the use of subterranean water.
However, the magma in the volcano is of the nature that it doesn't have to come in contact with water for phreatic explosions to happen, which indicates that ash will continue to be produced.
Einarsson explained that when the eruption becomes isolated from the water around the crater, phreatic explosions decrease.
The reason seems to be that a cut has opened in the side of the caldera and ice melt is now draining steadily down the side of the mountain - this both reduced the danger of further flash floods, and the danger of phreatic eruptions.