1. The problem statement, all variables and given/known data An earthquake with a magnitude of 5.4 is 39 times as intense as an aftershock that occurs 5 hours later. What is the magnitude of the aftershock. 2. Relevant equations m=log_10(i/i_0) 3. The attempt at a solution I know that I what to find the magnitude m=log_10(39/i_0) I am stuck because I do not know what # do I replace "/i_0' with..please help!?