EOSC 114 Final: EOSC 114 - Natural Disasters - All Chapters on Exam
27 Sep 2011
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Document Summary
Most tsunamis are triggered at subduction zones long, narrow strips of earth"s lithosphere (outermost layer containing the crust and upper mantle) where one tectonic plate moves beneath another. 2 tsunami warning signs: strong ground-shaking close to the epicenter, a rapid withdrawal of the sea to very low levels. Natural hazards are caused by both internal (from inside earth) and external processes (from the sun). Processes are the ways in which events affect the surface of the earth. Hazard = any natural process that threatens human life or property. Risk = the probability of a hazardous event times the expected damage. Disaster/catastrophe = events that cause serious injury, loss of life, and property damage in a brief amount of time over a speci c area (catastrophe tends to be more severe and takes longer to recover from) Mitigation = efforts to prepare for disasters to minimize their effects.
