A generalized law for aftershock decay rates is provided through the combination of the Gutenberg-Richter frequency magnitude relation, Bath's law, and the modified Omori's law. Several large quakes with readily identified aftershocks were studied. Results indicate that aftershock decay rates depended on several parameters specific to each seismic region. It was found that the law can be used to forecast the rate of aftershock occurrence after specific information about the main shock's magnitude and the area's land is known.
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