Geology notes november 12 for exam 3

Geology notes november 12 for exam 3 - The New Madrid...

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Geology The Richter magnitude is a measure of the amount of energy released at the earthquake focus -Largest nuclear bomb ever detonated was the Tsar Bomba with a yield of 50 megatons. Intraplate earthquakes occur in the eastern United States. -An intraplate earthquake is an earthquake that occurs in the interior of a tectonic plate, whereas an interpolate earthquake is one that occurs at a plate boundary. In the winter of 1811-1812, the central Mississippi Valley was struck by three of the most powerful earthquakes in U.S. history
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Unformatted text preview: The New Madrid earthquakes toppled cabins, sunk river barges, and caused Reelfoot Lake to form The New Madrid earthquakes are related to a failed continental rift zone-About 200 million years ago when Pangaea was breaking apart a rift zone formed in the central US.-That rift zone only opened up a little bit and then failed to open further.-It remains today as a zone of weakness The deformation that causes eastern US earthquakes comes from the mid-Atlantic ridge pushing against the North American continent...
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This note was uploaded on 08/09/2011 for the course GEOS 1004 taught by Professor Aksinha during the Fall '08 term at Virginia Tech.

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