Definition
Natural disaster is a natural event that causes misery, damage, loss, and suffering of the population. Excluding catastrophe caused by plant pests or outbreaks. Other disasters such as hurricanes and so on. Recorded natural disasters are disasters that occurred in the last 3 years. Calculated based on the number of catastrophic episode.
Episode is a series of timed events that are not always coherent and interspersed with stops.
Example: a volcano during the last 2 months is always erupt and cause earthquakes. Such is the case for the first time calculated volcanic eruptions and 1 earthquakes.