A geologic hazard is one of several types of adverse geologic conditions capable of causing damage or loss of property and life. These hazards consist of sudden phenomena and slow phenomena:Eisstoß Feb.2006 Vienna, Austria (Donauinsel)Glacier just above Grindelwald, Switzerland A geologic hazard is one of several types of adverse geologic conditions capable of causing damage or loss of property and life. These hazards consist of sudden phenomena and slow phenomena: Sudden phenomena include: Gradual or slow phenomena include: