Liquefaction phenomenon?

Liquefaction and the soft sand in the land of high plains and groundwater levels, such as landfill, which is a phenomenon that liquid ground vibrations when the earthquake happened.
Large proportion buried structures which can collapse, the density structure of the subsurface light (sewers, manholes, etc.) then you will stand out.
　 Thus, there was such damage, such as houses tilt and Urayasu, Chiba City, Chiba Prefecture, eastern Japan at the 2011 earthquake.

How do I measure how

１、Measures before building a house
Tighten the soil cement, cement hardens, you have such support.

２、Then built a house
Piling in the ground from the ground, lay the ground with concrete, theoretically how to respond, such as there, so do costs nearly 10 million cases of households, in practice, but the liquefaction phenomenon is building erected after that is quite difficult to prevent.