EOSC 114 Midterm: EOSC 114 Midterm 1 Learning Goals

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5 Jul 2016
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Compare and contrast risk, perception of risk, hazard, and vulnerability. Hazards are any event/situation that can cause human or economic harm. Vulnerabilities are weaknesses that could be affected by a disaster. Risk is the probability that any given hazardous event might occur (chance of a potential loss). Humans are poor at judging risk and our perceptions skew our ability to judge risk. Relate natural-disaster risk & intensity to frequency, return period, and consequences (costs). Risk, intensity and frequency are all directly proportional to the consequences (costs). But when such disasters do occur, they require huge expenditures of time and money for recovery. Return period is the average number of years between disaster events of the same magnitude. It is calculated with the formula: rp = (time span of data) / (# of cases of m magnitude). Frequency: number of occurrences in a given length of time i. e. frequency= 1/period, period=