Question 191142: On March 2, 1933, an earthquake of magnitude 8.9 on the Ritcher scale struck Japan. In October 1989, an earthquake of magnitude 7.1 on the Ritcher scale struck San Francisco, California. How many times more intense was the Japan earthquake than the San Francisco earthquake?
Round-off your answer to the nearest unit.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! On March 2, 1933, an earthquake of magnitude 8.9 on the Ritcher scale struck Japan. In October 1989, an earthquake of magnitude 7.1 on the Ritcher scale struck San Francisco, California. How many times more intense was the Japan earthquake than the San Francisco earthquake?
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The power of a 8.9 Richter reading is 10^8.9
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Equation:
(10^7.1)x = 10^8.9
x = (10^8.9)/(10^7.1) = 10^(1.8) = 63.1
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The Japan quake was 63.1 times as stong as the SF quake.
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Cheers,
Stan H.
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