Geologic Hazard 3 : A natural geologic event that can endanger human lives and threaten human property. Earthquakes, geomagnetic storms, landslides, sinkholes, tsunamis, and volcanoes are all types of geologic hazards
National Atlas of the United States, Geologic Hazards (Article with illustration), US Department of the Interior, USA 2011. http://www.nationalatlas.gov/articles/geology/a_ge ohazards.html, (ND/ Erthq - Amer) {138}