New Madrid seismic zone - Wikipedia
The faults responsible for the NMSZ are embedded in a subsurface geological feature known as the Reelfoot Rift, which likely formed during the Cambrian Period. [3] The Reelfoot Rift was first described by Ervin and McGinnis (1975) and believed to be of late Precambrian age. [4]
1811–1812 New Madrid earthquakes - Wikipedia
The epicenters of over 4,000 earthquakes can be identified from seismic measurements since 1974, originating from the seismic activity of the Reelfoot Rift. Forecasts for the next 50 years estimate a 7-10% chance of a major earthquake like those of 1811–1812, and a 25-40% chance of a quake of magnitude 6 or greater.
Computer Simulation of a Magnitude 7.7 Earthquake in the New Madrid …
The simulation is based on a detailed geologic model of the central U.S. and is intended to show the general character of the long-period ground shaking expected for a large earthquake in the New Madrid seismic zone. It demonstrates the profound focusing effect the Reelfoot rift has on ground shaking produced by earthquakes.
The New Madrid Seismic Zone | U.S. Geological Survey - USGS.gov
The Reelfoot rift is identified today as a subsurface system of fractures and faults in the earth's crust. New Madrid seismicity is spatially associated with the Reelfoot rift and may be produced by movement on old faults in response to compressive stress related to plate motions.
The Great Midwest Earthquake of 1811 | Smithsonian
Geologists have long blamed the New Madrid earthquakes on the Reelfoot Rift, a 500-million-year-old area of weakness in the crust. But the newfound faults lie outside the rift.
Geologic Cracks Record Earthquakes on the Reelfoot Fault in …
Apr 25, 2019 · Three large earthquakes in the New Madrid seismic zone between December 1811 and February of 1812 shook a huge area from the mid-west to the east coast. Historical accounts, as well as many scientific studies, have established their approximate locations (see map) and magnitudes (~M7+).
Summary of 1811-1812 New Madrid Earthquakes Sequence
A notable area of subsidence that formed during the February 7, 1812, earthquake is Reelfoot Lake in Tennessee, just east of Tiptonville dome on the downdropped side of the Reelfoot scarp. Subsidence there ranged from 1.5 to 6 meters, although larger amounts were reported.
Reduced-to-pole magnetic anomaly map of the New Madrid seismic zone with earthquakes epicenters and boundaries of major geophysical features...................................................................................................................
Earthquakes on the Mississippi: The New Madrid Seismic Zone
The New Madrid Seismic Zone lies within the Reelfoot Rift. To earthquake researchers like Hough, this region is an enigma. As her email notes, there are a lot of other failed mid-continent rifts in North America.
Possible causes of the New Madrid earthquakes - Encyclopedia Britannica
Compelling evidence also exists to support the notion that the earthquakes arose from activity occurring along the Reelfoot Rift, an ancient subterranean rift zone thought to have developed some 500 million years ago after geologic forces pulled the region in a …
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