Online thematic map of the proportion of disasters caused by natural disasters in China (1978-2000).Legend is disaster ratio, occurrence ratio, in terms of severity, the ratio from strong to weak is 0.15-0.37; 0.09-0.15; 0.07-0.09; 0.05-0.07; 0.04-0.05; 0.03-0.04; 0.02-0.03; 0.01-0.02 and less than 0.01.
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