A natural hazard becomes a disaster when at least one of the following criteria are met: 10+ people are killed. 100+ people are affected. A state of emergency is declared. International assistance is called for.
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Primary and Secondary effects of Natural Hazards?
Primary Effects occur as a direct result of the incident, e.g. Burst water pipes, collapsed buildings. Secondary Effects occur as a result of the primary effects, e.g. Disease, starvation
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Factors affecting Hazard Risk?
Human: Level of Preperation, Level of Development, Population density, Building/Infrastructure, Type of Governance. Physical: Magnitude/frequancy of hazard, Location of Hazard, Time of Day, Type of Hazard
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Distribution of Tectonic Hazards?
All Tectonic Hazards are located near plate margins, and there are dense clusters on the Pacific Ring of Fire, and the Mid-Atlantic Ridge.
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Hot Spots?
Hot spots are places within the mantle where rocks melt to generate magma.Mantle plumes are areas of hot, upwelling mantle. A hot spot develops above the plume. Magma generated by the hot spot rises through the plates and produces an active Volcanoe.
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