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Small Earthquakes are Useful Predictor of Large Ones
Conventional wisdom in seismology says slip on faults that rupture during the largest continental strike-slip earthquakes is generally limited to the seismogenic layer, the upper 15 km or so of the earth's crust to which aftershocks extend and background seismicity is limited. That idea when coupled with theory predicts that the amount of slip on faults in large earthquakes should not continue to increase once the dimensions of a rupture have surpassed about 15 km. The prediction is not supported by observation.
Source: ScienceDaily