geology- part 1

geology- part 1 - GEOLOGY PART 1. I. Why do people live in...

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GEOLOGY PART 1. I. Why do people live in dangerous areas? A. floodplains- modes of transportation and trade - resources/ water, volcanos- fertile soil - people think it wont happen to them - cheaper/ riskier B. Past disasters are easel forgotten - even though some natural events seem sudden they really are the cause of slow processes occurring over a large period of time ( no geologic time frame.) - Geologic processes produce a large cumulative effects. ex. grand canyon, the layers in the canyon are the depositions of sand and layers built then the canyon was created by the river. II. A. Natural hazards: natural process which poses threat to human life or property( middle of no where) B. natural disaster: natural event that causes significant damage to life and property - impact of a disaster= size of event and location - As global population increases, the number of casualites increase and cities grow larger. III. Economic impact of natural disasters - As the number of people in an catastrophic event increases ----> greater economic losses in developed countries ----> Increasing number of deaths in developing countries { smaller events happen more frequently and larger events happen less frequently } *frequency of events in inversely related to magnitude. Magnitude of a natural disaster depends on the number of people affected - earthquakes in sparse areas are not seen as disasters - human population growth is a factor in frequency of natural disasters IIII. Predicting catastrophies. - some natural events have predictable cycles but usually there are many overlapping cycles. FORECAST HAZARDOUS EVENT: 1. certain area, 2. when/ time frame. 3. Magnitude 4. Probability of occurrence Recurrance interval: probaility that natural event of a particular size will happen within a time frame, ON AVERAGE. - small events can provide insight to large events ( ex. earthquakes) - Many geological features are fractal - look the same regardless of size. IV. Relationships among events. - some events are a direct consequence of the other events. - unrelated variables can overlap==> AMPLIFY - some events have warnings. V. Prepare for disasters 1. Land use planning- find out where disasters are likely to occur and restrict development there ( usually happens to late, after the incident occurs, also ignites political and legal opposition, can be viewed as infringements on person and property
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rights. 2. Insurance - mitigates financial impact of disasters - costs are based on risk analysis Risk is proportional to recurrence interval TIMES cost. - cost is accurate but can be an educated guess - potential cost could put insurance ompanies out of business - private insurance companies can form pools to cover high, risks and unexpected costs. - some hazards are not covered but people still need to pay mortgage to the
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geology- part 1 - GEOLOGY PART 1. I. Why do people live in...

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