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The magnitude, R, on the Richter scale of an earthquake of intensity I is given by R = log
(I/I_0), where I_0 is the intensity of a barely felt zero-level earthquake. The Loma Prieta
earthquake of 1989 in Northern California was 10^7.1 as intense as a zero-level earthquake.
What was its magnitude on the Richter scale?
Solution
R = log(I/Io) ; Io = intensity of zero level earthquake ;
In northen California : I/Io = 10^7.1
R = log(10^7.1) = 7.1log10 = 7.1

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