A formula for calculating the magnitude of an earthquake is M = glog (i) that uses the common En (base 10] logarithm. This is called the Moment Magnitude Scale {Ml-IS). an alternative to the more well known Richter Scale. One earthquake has magnitude 3.9 on the MMS. If a second earthquake has 550 times as much energy as the first. nd the magnitude of the second quake. Round to the nearest hundredth. The magnitude of the second earthquake was