Earthquake Cycle
Earthquake Cycle : The notion of an earthquake cycle dates back to the hypothesis formulated by H. F. Reid on the basis of his observations in the 1906 San Francisco, CA earthquake. The concept holds that two comparable sized earthquakes rupturing the same segment of a fault will be separated by a period of time long enough to reaccumulate strain in the amount equal to the elastic strain drop in the first earthquake. The stages in the cycle are: (1) a long period of seismic quiescence, except for the aftershocks, following a major earthquake, (2) a shorter period of increased seismicity as elastic strain accumulation approaches the critical strain level, and 3) the next major earthquake as the critical strain level is suddenly exceeded
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