On the Richter Scale, the Magnitude $R$ Of an Earthquake of Intensity

question 25

Multiple Choice

On the Richter scale, the magnitude $R$ of an earthquake of intensity $I$ per unit of area is given by $R = \log _ { 10 } \left( \frac { I } { I _ { 0 } } \right)$ where $I _ { 0 } = 1$ is the minimum intensity used for comparison. Find the magnitude $R$ (on the Richter scale) of an earthquake of intensity $I = 8,710,000$ Round to the nearest thousandth.

• A)8.940
• B)7.940
• C)9.940
• D)6.940
• E)3.940

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