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New Madrid Seismic Zone
The New Madrid Seismic Zone (pronounced ), sometimes called the New Madrid Fault Line, is a major seismic zone and a prolific source of intraplate earthquakes (earthquakes within a tectonic plate) in the southern and midwestern United States, stretching to the southwest from New Madrid, Missouri.
The New Madrid fault system was responsible for the 1811–12 New Madrid earthquake and may have the potential to produce large earthquakes in the future. Since 1812, frequent smaller earthquakes have been recorded in the area.
Earthquakes that occur in the New Madrid Seismic Zone potentially threaten parts of seven American states: Illinois, Indiana, Missouri, Arkansas, Kentucky, Tennessee and Mississippi.〔Stelzer, C.D. ("The earthquake hazard here may be greater than you think. And planning for it is less than you'd expect" ) ''Riverfront Times'' (December 15, 1999)〕
==Location==
The long fault system, which extends into five states, stretches southward from Cairo, Illinois; through Hayti, Caruthersville and New Madrid in Missouri; through Blytheville into Marked Tree in Arkansas. It also covers a part of West Tennessee, near Reelfoot Lake, extending southeast into Dyersburg. It is southwest of the Wabash Valley Seismic Zone.
Most of the seismicity is located between beneath the Earth's surface.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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