Survivalism (Disasters) 

Survivalism is a commonly used term for the preparedness strategy and subculture of individuals or groups anticipating and making preparations for future possible disruptions in local, regional or worldwide social or political order. Survivalists often prepare for this anticipated disruption by learning skills (e.g., emergency medical training), stockpiling food and water, preparing for self-defense and self-sufficiency, and/or building structures that will help them to survive or "disappear" (e.g., a survival retreat or underground shelter).

The specific preparations made by survivalists depend on the nature of the anticipated disruption(s), some of the most common scenarios being:

Natural disaster clusters, and patterns of apocalyptic planetary crises or Earth changes, such as Climate Change bringing on tornadoes, hurricanes, earthquakes, blizzards, and severe thunderstorms, etc.
A disaster brought about by the activities of mankind: chemical spills, release of radioactive materials, war, or an oppressive government.
General collapse of society, resulting from the unavailability of electricity, fuel, food, and water.
Monetary disruption or Economic collapse, stemming from monetary manipulation, hyperinflation or world-wide depression.
Widespread chaos, or some other unexplained apocalyptic event.
Within pop-culture, especially in the United States, the term is also used to refer to isolationist groups, often with anti-government agendas. Pop-culture survivalism is often associated with paramilitary activity, though real world survivalism rarely includes such activities.

Source: Wikipedia