Earth quakes from 1973 to 2010

Description

The time, location and magnitude of all the earth quakes with magnitude being greater than 6 since 1973.

References

http://cos.name/cn/topic/101510

Examples

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data(quake6)
library(ggplot2)
qplot(year, month, data = quake6) + stat_sum(aes(size = ..n..)) + 
    scale_size(range = c(1, 10))