NZ Earhquake

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Jutte
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Joined: Wed Aug 22, 2007 11:01 am
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Location: NZ

NZ Earhquake

Post by Jutte » Wed Feb 23, 2011 7:14 pm

Just to let you guys know - my extended family in Christchurch are all
accounted for and are OK.Christchurch on the whole is a mess though.

Mark
Posts: 10771
Joined: Sat Oct 11, 2003 10:14 pm

Re: NZ Earhquake

Post by Mark » Sun Feb 27, 2011 3:35 pm

Glad your extended family is well. Seems most places have one form of risk or another.

Christchurch Earthquake Showing how the sand liquefies with vibration
http://www.youtube.com/watch?v=tvYKcCS_J7Y

More of a clay than sand, kind of a thixotropic effect.
"Some clays are thixotropic, with their behavior of great importance in structural and geotechnical engineering. In earthquake zones, clay-like ground can exhibit characteristics of liquefaction under the shaking of a tremor, greatly affecting earth structures and buildings."
http://en.wikipedia.org/wiki/Thixotropy
Presentation is Everything

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