earthquake

General Preparedness

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Anonymous

(@anonymous)

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Joined: 15 years ago

Posts: 11254

Topic starter 26/04/2012 2:20 am

How strong of an earthquake does it take to leave a mark on the geological record? We can tell when there were major earthquakes in history by looking at the shifts in layers of rock and soil - but earthquakes happen all the time, mostly small. So how strong must an earthquake be before it leaves noticeable geological evidence?
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