A seismograph (300 mathrm{~km}) from the epicenter of an earthquake recorded a maximum amplitude of (4.9 times
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A seismograph \(300 \mathrm{~km}\) from the epicenter of an earthquake recorded a maximum amplitude of \(4.9 \times 10^{3} \mu \mathrm{m}\). Find the earthquake's magnitude. What would be the Richter scale reading for a seismograph \(20 \mathrm{~km}\) from the epicenter of the same earthquake?
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