A series of three to five major earthquakes (believed to have been magnitude 7.0 or larger earthquakes) occurred in the NMSZ in the two month period between Dec. 16, 1811 and February 7, 1812. But the newfound faults lie outside the rift. Smithsonian Magazine
The fault zones capable of producing damaging earthquakes in Missouri are constantly active. Earthquake Hazard in the Heart of the Homeland; 2002; FS; 131-02; Geological Survey (U.S.) But New Madrid sits in the middle of a plate. Located along the southeastern Missouri border, it was the source of historic earthquake activity between 1811 and 1812, producing between 3 and 5 "great quakes" and literally thousands of strong, moderate, and minor quakes for months afterwards.Geological studies indicate that the 1811-1812 series of quakes was not an isolated occurrence. 20 cool facts about the New Madrid Seismic Zone-Commemorating the bicentennial of the New Madrid earthquake sequence, December 1811-February 1812 [poster]; 2011; GIP; 134; Williams, R. A.; McCallister, N.S.
Today, with urban development and the area much more densely populated, the impact of earthquake activity is a source of great concern.Many buildings, especially unreinforced masonry constructed before seismic engineering and modern building codes were instituted, would be highly vulnerable to damage from earthquakes. It’s the most active seismic area in the United States east of the Rockies, with about 200 small quakes a year.Magnani’s most startling discovery came south of the seismic zone: two faults, one near Memphis, both active in the past 10,000 years.
While these earthquakes are more frequent in the NMSZ in southeast Missouri, they also occur on other faults located in Missouri and surrounding states. Earthquake Lists, Maps and Statistics Largest earthquakes, significant events, lists and maps by magnitude, by year, or by location. The quakes measured at magnitude 1.1, … Two additional earthquakes of similar magnitude followed in January and February 1812. Label info: M = magnitude, D = depth (km), Time = UTC – Missouri = UTC – 6 These included 15 quakes believed to have been magnitude 6.5 to 8.0 (the size range of the 1989 San Francisco, 1… This assessment is...The central and eastern United States has experienced only 5 historic earthquakes with Mw 7.0, four during the New Madrid sequence of 1811-1812: three principal mainshocks and the so-called «dawn aftershock» following the first mainshock.
1.6 magnitude earthquake 2020-07-08 10:57:45 UTC at 10:57 July 08, 2020 UTC Location: Epicenter at 36.656, -89.544 7.2 km from New Madrid (4.2 miles)
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Click on an event "DATE" to get additional text information. “Maybe the reason we haven’t been able to solve the mystery of the New Madrid earthquakes is that we’ve been too focused on New Madrid,” Magnani says. The risk of a smaller, though still devastating, 6.0 earthquake in the next 50 years is 25 to 40 percent. “We’ve got to get a solid understanding of what large earthquakes happened where and when,” she says.
No data point selected. Tap/click on "gear icon" for options and settings. A series of earthquakes hit the New Madrid seismic zone of southeastern Missouri, northeastern Arkansas, and adjacent parts of Tennessee and Kentucky, in December 1811 to February 1812. The space-time distribution of the increased seismicity, as well as numerous published case studies, indicates that the increase is of anthropogenic origin, principally driven by injection of wastewater coproduced with oil and gas from tight...This poster summarizes a few of the more significant facts about the series of large earthquakes that struck the New Madrid seismic zone of southeastern Missouri, northeastern Arkansas, and adjacent parts of Tennessee and Kentucky from December 1811 to February 1812.
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