New Madrid Earthquake

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Arch C. Johnston and Eugene S. Schweig researched the New Madrid seismic activities of 1811-1812 and concluded that: The first earthquake was likely caused by slippage along a fault within the Blytheville arch and along the Bootheel fault. The length of the two reactivated fault segments was around 140 kilometers (deBoer & Sanders, n.d., p. 117-119). Johnston and Schweig believe the second earthquake was likely due to the breakup of the New Madrid fault that runs northeast to southwest, close to New Madrid. The slippage was estimated to be about 8 meters (deBoer & Sanders, n.d., p. 117-119) They believe the third earthquake was likely due to the rupturing of the Reelfoot fault, where the slippage was as much as 10 meters (deBoer & Sanders,

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