File:Sand boil Imperial 1979.tif

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English: Effects of the 1979 Imperial Valley earthquake — in the Colorado Desert region, Imperial County, Southern California.
  • " A sand boil near El Centro provides graphic evidence of liquefaction. Such boils were found especially along the southern extent of the Imperial Fault.
Liquefaction occurs when earthquake ground shaking distorts the granular structure of the ground causing some loosely packed groups of grains to collapse together. Each collapse transfers pressure from the grain groups to the water. When the pore-water pressures reach a critical level, the granular material suddenly behaves as a liquid rather than a solid and liquefaction has taken place. "
Date
Source [1]
Author G. Reagor, USGS

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Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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current08:57, 22 January 2012Thumbnail for version as of 08:57, 22 January 20121,000 × 667 (1.27 MB)Mikenorton (talk | contribs)

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