Disaster is a catastrophic event adverse, unfavourable, harmful or detrimental event that cause large-scale fatalities, property and infrastructure damage, social and economical hampering and environmental disruption.
Types of disasters - by risk level
Existential Disaster / Global Catastrophic Disaster
A disaster which could damage or pose risk to lives of human being on a global scale or a disaster that could cause human extinction. If a disaster can permanently or drastically curtail humanity's potential and advancement, that is also categorised as Existential disaster.
A disaster that pose threat or damage to human life at local level - country or region to be specific.
Type of disaster - by their origin
A disaster that occur due to natural processes - geological, atmospheric, hydrological etc. Hurricanes, tornadoes, earthquakes, floods, volcanoes are natural disasters.
Eruption of Mount St. Helens, 1980
Eruption of Mount Tarawera, 1886
Anthropogenic Disasters / Human-made Disaster
A disaster which happen due to human negligence, carelessness, inattention, irresponsibility, unethical deeds and works are Anthropogenic disasters. Anthro, a Greek words, means 'pertaining to humans/man , related to human life'. Terror attacks, race riots, mass shootings are man-made disasters.
Atomic bombings of Hiroshima and Nagasaki
Mumbai attacks, 2008
A disaster that is caused by either human error in controlling technology or a malfunction of a technology system. Chemical releases, ocean oil spills, natural gas explosions are technological disasters. Technological disaster is categorization under Anthropogenic disasters.
Chernobyl Disaster, 1986
Exxon Valdez oil spill, 1989
Great Smog of London, 1952
Bhopal Diaster, 1984