Sand boil

A sand boil is sand and water that come out onto the ground surface during an earthquake as a result of liquefaction at shallow depth.

Seepage characterized by a boiling action at the surface surrounded by a cone of material from deposition of foundation and/or embankment material carried by the seepage. A swirling upheaval of sand or soil on the surface of or downstream from an embankment caused by water leaking through the embankment. The ejection of sand and water resulting from piping.