The Richter scale measures the magnitude, M, of an earthquake as a function of its intensity, I, and the intensity of a reference earthquake, I0. M = log(I/I0). Which equation calculates the magnitude of an earthquake with an intensity 10,000 times that of the reference earthquake?
a. M = log(1/10,000)
b. M = log(10,000)
c. M = log(I/10,000)