Though, all kinds of disaster require more or less similar skill-sets and rescue-efforts at least a few days after the event, it is important to understand various kinds of disasters. Depending upon the actual nature of disaster, the immediate reaction needs to be different.
Also, the first few moments of disasters are distinctly different for each kind of disasters. Thus, understanding of each kind of disaster might also help in identifying the onset of a disastrous event, so that a trained person can undertake some key actions, during the initial few moments. This could have a major impact on the final outcome in terms of amount of final loss.
These are primarily natural events. It is possible that certain human activities could maybe aid in some of these events, but, by and large, these are mostly natural events. Earthquakes Volcano Floods Tornadoes, Typhoons, Cyclones
These are mostly caused due to certain human activities. The disasters themselves could be unintentional, but, are caused due to some intentional activity. Most of these (barring coordinated terrorist activities) are due to certain accidents – which could have been prevented – if sufficient precautionary measures were put in place.