An often heard “rule of thumb’’ is that the largest aftershock is usually about a magnitude unit smaller than the mainshock (this was termed Bath’s law by Richter, ¨ 1958).Assuming this is true,...

An often heard “rule of thumb’’ is that the largest aftershock is usually about a

magnitude unit smaller than the mainshock (this was termed Bath’s law by Richter, ¨

1958).Assuming this is true, estimate how many aftershocks a local network would

record of M ≥ 1.5, following a M 6.5 mainshock. Hint: Assume a b-value of 1.