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Liquefaction may occur in fills, swamps, sloughs, or bogs, or other areas of loose, unconsolidated, poorly drained material that have a high water table or are prone to flooding. Soils and geologic maps and aerial photographs can be useful in determining areas of potential liquefaction, and some of the Earthquake Hazards maps in the NBMG Urban Area Maps imply some areas of potential liquefaction. The USGS has some liquefaction information, and our website has several generalized publications on liquefaction. The GBSSRL has no liquefaction maps. For information on a particular site, one may check with the local county engineer's office or hire a consulting geologist or engineering firm to do a site study.