Scale Description Physical measure Average Frequency; (1 cycle = 11 years) R 5 Extreme X20; (2 x 10‑3) Less than 1 per cycle R 4 Severe X10; (10‑3) 8 per cycle; (8 days per cycle) R 3 Strong X1; (10‑4) 175 per cycle; (140 days per cycle)
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