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.
NZ Earhquake
Moderator: Mike Everman
Re: NZ Earhquake
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
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