OpenStax, Algebra and Trigonometry 2e §6.3 Logarithmic Functions · Exercise 71 · Algebra · Exponentials & logarithms

Logarithmic Functions · Exercise 71

The intensity levels I of two earthquakes measured on a seismograph can be compared by the formula $l o g \frac{I _{1}}{I _{2}} = M_{1} - M_{2}$ where $M$ is the magnitude given by the Richter Scale. In August 2009, an earthquake of magnitude 6.1 hit Honshu, Japan. In March 2011, that same region experienced yet another, more devastating earthquake, this time with a magnitude of 9.0. How many times greater was the intensity of the 2011 earthquake? Round to the nearest whole number.

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OpenStax, Algebra and Trigonometry 2e · §6.3 Logarithmic Functions · Exercise 71

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