“It seems probable that a very long period will elapse before another important earthquake occurs along that part of the San Andreas rift which broke in 1906; for we have seen the strains causing the slip were probably accumulating for 100 years.” Professor Reid in his 1910 contribution to the Lawson Commission report thus anticipated why the centenary of the San Francisco earthquake would be so significant to earthquake scientists: the northern San Andreas, in decimal markers of logarithmic age, is entering a mature stage of the Reid cycle.

The south-central portion of the San Andreas reached its earthquake centenary...

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