within a given period of time in a basic unit. This indicator reflects the mass characteristics of natural disasters in the basic unit. The data were collected from the number of natural disasters in the provincial press database.

Natural disasters refer to events that occur in nature and constitute a hazard to human life and property. Natural disasters with great impact on human beings include typhoon, flood, drought, earthquake, volcano, landslide and debris flow. Natural disasters seriously affect the normal order of production and life, threatening human and security. The catastrophic population and serious agricultural disasters are a prominent feature of natural disasters in China.

The natural calamities are directly related to the disaster situation, the population, and the history of agricultural development. At the same time, the variety of natural disasters and the frequent occurrence of natural disasters are also the causes of serious disaster and agricultural disasters.

There are many types of natural disasters in China, such as special geographical location, mountainous landform, strong crustal activity and unstable monsoon circulation control.

Source: Atlas of China's Natural Disaster System