Eyewitnesses The New Madrid Earthquakes of 1811-12 caused such a major shift http://www.new-madrid.mo.us/index.aspx?nid=132 http://www.new-madrid.mo.us/index.aspx?nid=132 caused such a major shift http://www.new-madrid.mo.us/index.aspx?nid=132 Eyewitnesses http://www.new-madrid.mo.us/index.aspx?nid=132 city’s website from the epicenter New Madrid earthquakes 1812 New Madrid earthquake(s) earthquakes running in the opposite direction biggest seismological event in recorded history caused such a major shift