0 Detected by sensitive seismographs (some can detect magnitudes of less than zero!)
1 Detected by instruments
2 Lowest felt by humans
3 Slight vibration; more than 100,000 a year around the world
4 Up to 15,000 a year; at 4.5, would be detected by seismographs worldwide, but cause little damage.
5 3,000 a year; that 1960 earthquake in Agadir, Moroco was 5.6
6 100 a year worldwide
7 20 a year; the 1995 earthquake in kobe, Japan was 7.2
8 Major destructive earthquakes; average two a year; the 1904 San Francisco earthquake was probably 8.25
9 No quake higher than 8.9 has been recorded, but 9.0 or even higher is theoretically possible
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