The 1923 earthquake close to San Bernardino, California had an intensity of 1995262.315Io. Use the formula R = log[I/Io], to find the magnitude of the earthquake.

Answer 1

By using the Richter magnitude formula, which is R = log (I / I₀). Based on the problem, the intensity is: I = 1,995,262.315 I₀. Now, we can substitue into the formula, which will become, R = log (1,995,262.315). And after computing the logarithm (base 10), it will approximately 6.3, and that would the approximate answer to the magnitude of the earthquake.