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The New Madrid seismic zone (NMSZ), sometimes called the New Madrid fault line (or fault zone or fault system), 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.
Pressure on the fault where the 1811–1812 New Madrid earthquakes occurred was believed to be increasing, [23] but a later study by Eric Calais of Purdue University and other experts concluded the land adjacent to the New Madrid fault was moving less than 0.2 mm (0.0079 in) a year, increasing the span between expected earthquakes on the fault ...
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 fault 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 ...
1811–1812 New Madrid earthquakes; Geology of Illinois; ... Seismicity map of the State of Illinois (Report). Miscellaneous Field Studies Map 1143. United States ...
“Instead of allowing this event to scare you, use this real world event to help you review and update your family emergency plan,” public safety official said.
Petersburg was damaged by an earthquake originating in the New Madrid Fault on July 18, 1909. The earthquake was felt over most of central Illinois, but Petersburg suffered the most widespread damage. The portions of Petersburg located below the bluffs suffered major flood damage during the intense flood season of 1993.
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.
Isoseismal map of the earthquake (I–III are instrumental to slight, IV is moderate, V is rather strong, VI is strong, VII is very strong) The 1968 Illinois earthquake was the largest recorded earthquake in the "Prairie State", measuring 5.4 on the Richter scale.