SOLUTION: According to the United States Geological Survey, the San Francisco earthquake of 1906 resulted in a seismographic reading of 63,096 millimeters 100 kilometers from its epicenter.

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Question 249817: According to the United States Geological Survey, the San Francisco earthquake of 1906 resulted in a seismographic reading of 63,096 millimeters 100 kilometers from its epicenter. What is the magnitude of this earthquake? M(x) = log (x/10^-3)
Answer by stanbon(75887) About Me  (Show Source):
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According to the United States Geological Survey, the San Francisco earthquake of 1906 resulted in a seismographic reading of 63,096 millimeters 100 kilometers from its epicenter. What is the magnitude of this earthquake? M(x) = log (x/10^-3)
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M(63,096) = log(63,096/10^-3) = log(63096000) = 7.8
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Cheers,
Stan H.