Ground still moving in Japan

Surreal video of the ground shifting during aftershocks after the Japan quake in 2011. Cracks appear and disappear in the sidewalk and soil.
kceaton1says...

It's ground water forced up and basically related to sand "volcanoes". This is formed due to liquefaction (Salt Lake City will get the same thing when our earthquake comes. This happens all the time in earthquakes if the land is an ancient seabed, has ground water near the surface, or any other situation that is similair like this reclaimed land.

Don't worry about it too much unless it's a huge one (which would be rare). The big problem is that since it acts like quicksand all the buildings (or anything weighing the right amount) will sink into the ground.

deathcowsays...

Seriously though that some obvious liquidification going on right there. Lets quote Wikipedia:

"Soil liquefaction describes a phenomenon whereby a saturated soil substantially loses strength and stiffness in response to an applied stress"

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