Liquefaction is defined as the transformation of a granular material from a solid state into a liquefied state as a consequence of increased pore-water pressures. Soils and clastic sediment with particle size in the medium sand to silt range, as determined by the Unified Soils Classification System, are particularly susceptible to liquefaction when they are saturated with water and shaken by an earthquake. Liquefaction at or near the surface can result in foundation failure and property damage.
(Ord. MC-676, 9-19-89)