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Magnetic potential map of the Reelfoot Rift. The New Madrid Seismic Zone (NMSZ), 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.
New Madrid fault and earthquake-prone region considered at high risk today. The 1811–1812 New Madrid earthquakes were a series of intense intraplate earthquakes beginning with an initial earthquake of moment magnitude 7.2–8.2 on December 16, 1811, followed by a moment magnitude 7.4 aftershock on the same day.
Locations of quakes magnitude 2.5 or greater in the Wabash Valley (upper right) and New Madrid (lower left) Seismic Zones. The Wabash Valley Seismic Zone (also known as the Wabash Valley Fault System or Zone) is a tectonic region located in the Midwestern United States, centered on the valley of the Lower Wabash River, along the state line between southeastern Illinois and southwestern Indiana.
The 1968 Illinois earthquake (a New Madrid event) [4] was the largest recorded earthquake in the U.S. Midwestern state of Illinois. Striking at 11:02 a.m. on November 9, it measured 5.3 on the Richter scale. [5] Although no fatalities occurred, the event caused considerable structural damage to buildings, including the toppling of chimneys and ...
Characteristics. Length. 7mi. Location of Marianna. The Marianna Fault is a fault located in the Crowley's Ridge area west of Marianna in eastern Arkansas. [citation needed] The discovery was first announced by seismologists on January 21, 2009. It is separate from the New Madrid Seismic Zone, [1] which is 100 kilometers (62 mi) to the east.
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Date Area Epicenter Mag. MMI Depth (km) Deaths Injuries Total damage / notes Source April 18, 2008: 7 km (4.3 mi) NNE of Bellmont, Wabash County: 5.2 M w: VII 14.3 2 Limited / strike-slip (left lateral)
150–160 earthquakes [1] The Guy-Greenbrier earthquake swarm occurred in central Arkansas beginning in August 2010. [2] The epicenters of earthquakes in the swarm showed a linear distribution, with a clear overall shift in activity towards the southwest with time, [3] and the largest event in the swarm was the 2011 Arkansas earthquake, at 4.7 ...