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Unformatted text preview: -what is a natural disaster? Natural phenomenon, high energy release, harmful to humans, many changes happening quickly or slowly-human fatalities, loss of property-natural hazards-exist even where disasters are infrequent, evaluate site risk, mitigation prior to event (engineering, physical, social and political plans and actions to reduce death and destruction from nat. hazards), mitigation after event (rebuilding and reinhabiting same site[case history: Popocatepetl volcano, Mexico])-magnitude, frequeny, and return period-inverse correlation b/w freq. and mag. of process (freq. are low in mag., rarely high in mag; small scale activity common, big events rare; larger event, longer return period/recurrence interval)-log scale: 1, 10, 100, 1000 etc.-economic losses: who suffers most?-energy sources on Earth: impacts (extraterrestrial materials), gravity, internal heat (including radioactive decay), sun-Newton’s Second Law: F=MA (Force (newtons)=Mass (kg) x Acceleration(meters/second squared))...
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- Fall '08