Magnitude | 1900 to 2013Â AD: Mean eruptions per century | 1500 to 1900Â AD: Mean eruptions per century | 450 to 1500Â AD: Mean eruptions per century | 450 to 1500Â AD rate as percentage of 1900 to 2013Â AD rate |
---|---|---|---|---|
4-4.9 | 56 | 21 | 7.8 | 14% |
5-5.9 | 9 | 6.5 | 3.24 | 36% |
6-6.9 | 4 | 1.25 | 1.14 | 29% |
7-7.9 | - | - | 0.19 | Â |