The magnitude, M, of an earthquake on the Richter scale is given by M=\log \left(\frac{I}{I_{0}}\right) ) The magnitudes of two earthquakes are 4.7 and 7.4. How many times as intense was the stronger earthquake than the less severe one? An earthquake is detected that is 450 times as intense as an earthquake with a magnitudeof 5.2. What is the magnitude of the new earthquake?