HW5 Seismology

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University of Washington *

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1445

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Physics

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Apr 3, 2024

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1

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Name: Date: Homework 5 - Calculating earthquake magnitude SHOW YOUR WORK FOR FULL CREDIT! 1. In the 1964 Alaska earthquake ( Magnitude 9.2 ), a seismogram at the University of Alaska - Fairbanks showed squiggles of amplitude 100 centimeters . a. What would have been the amplitude of the waves at this same seismograph in a magnitude 6.2 aftershock ? b. What would have been the amplitude of the waves at this same seismograph in a magnitude 4.2 aftershock ? 2. A 6.2 earthquake releases about the same amount of energy as 500 atomic bombs . a. What was the equivalent energy released (in terms of atomic bombs) by the main quake (Magnitude 8.2) ? b. How much energy (in terms of atomic bombs again) would be released in a magnitude 4.2 earthquake ? 100cm / 10= 10cm 10cm /10= 1cm M6.2= M9.2 - 3 1cm /10= .1 cm amplitude = .1 cm M6.2 - 2 = M4.2 .1 / 10 = 1 * 10 cm 2 -3 M6.2 + 2 = M8.2 500 *30 = 15,000 15,000 * 30 = 450,000 atomic bombs M6.2 - 2 = M4.2 500 /30 = 16.67 16.67 /30 = 5.6 * 10 atomic bombs -1 Natalie Bergner March 11, 2022
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