An Earthquake measures 6.1 on the Richter Scale. What is the rating on an earthquake that is twice as powerful? I = I0 × 10M I-intensity of earthquake I0-earthquake with intensity of 0 M-magnitude of earthquake on the Richter Scale So I figured I'd use I1 = I0 × 106.1 to find the intensity of earthquake 1 (I1) then, 2I=I2 to find the intensity of earthquake 2 (I2), which is double that of I1 and finally, M=log(I2/I0) to find the resulting magnitude, or rating, of the Richter Scale. But my problem begins at the very beginning. If I0 = 0 then I1 = 0 too... and I'm quite thrown off by this. Am I taking the totally wrong approach to this?