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Why do pendulum clocks stop during earthquakes?

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Earthquakes stop SOME clocks. Any clock which is smashed will, of course, stop working. Fortunately not all clocks are smashed. Your wristwatch will likely NOT stop during an earthquake, neither will that battery-powered WWV clock on your kitchen wall stop. read more

Most clocks do not stop during an earthquake. Earthquakes that are strong enough to trigger a power outage will stop electric clocks. The jolt of a strong quake could stop the pendulum of a grandfather clock in it’s tracks. read more

They don’t always stop but its pretty common and the reason is pretty simple. Most earthquakes take the form of compression waves that travel laterally along the surface of the earth resulting is a rapid back and forth motion. read more

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Like a clock, that stopped during an earthquake
Source: whaleoil.co.nz

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