许多地质过程影响状态,包括海岸和河流洪水和侵蚀、地震液化和震动产生,土地运动沉降和山体滑坡等,并从岩石和土壤氡发射。这些过程是自然和他们一直活跃在印第安纳州的地质历史。当这些过程影响的人口通常称为“地质灾害”。Other geologic hazards have been created by human activities. Three in particular are: subsidence associated with subsurface mining, coastal erosion of man-made structures because of longshore drift, and the potential of accidents related to open mining pits and quarries.