Investigate landform changes caused by an earthquake. Areas affected by earthquake induced landform changes will be identified to assist recovery efforts and to evaluate post-earthquake land use risks.
Sand boils and sand fissures sometimes occur during moderate to large earthquakes.
Surface water courses and groundwater levels may be changed. Areas that are well drained before an earthquake may become flooded and areas that were wetlands or shallow water bodies may dry out after an earthquake. The courses of some natural drainage, especially those near local base level, may change. The apparent depth of the water table may change because of the raising or lowering of the land surface. Lateral groundwater flow may be affected by fault gouge, sand fissures or areas of liquefaction.