Suppose earthquake A measures 3.2 on the Richter Scale. What was the Richter scale measure of earthquake B if it was 1900 times more powerful than earthquake A? Suppose earthquake A measures 3.2 on the Richter Scale. What was the Richter scale measure of earthquake B if it was 1900 times more powerful than earthquake A? Solution Msf = log(Isf/S) 8.3 = log(Isf/S) Now Msa = log(Isa/S) Given Isa = 1900Isf So, Msa = log(1900Isf/S) = log 1900 + log(Isf/S) = 3.278 + 3.2 = 6.478.