The recent Mw 4.2 Perry County eastern Kentucky earthquake occurred north of the ETSZ but has a focal depth and mechanism that are similar to those for ETSZ earthquakes. The recorded magnitude of both of the main quakes was 6.5 Mwc. Robert D. Hatcher, Jr., James D. Vaughn, Stephen F. Obermeier, 2013.

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0000018648 00000 n "I think we've got a pretty good case that this is related to active faulting, and that it does demonstrate that at least in periods of time in the past there have been strong earthquakes in the ETSZ," said Cox. Randel Cox of the University of Memphis and colleagues searched for signs of ancient earthquakes below the muddy waterline of Douglas Lake, a 1943 Tennessee Valley Authority lake created by impounding the French Broad River. 6�`q�g ��3� The fault zone has been associated with the Eastern Tennessee Seismic Zone. In the East Tennessee Seismic Zone, there have been 188 earthquakes of magnitude 2.5 or greater since measurements began in the 1970s. At one site, a thrust fault with one meter displacement suggests that one of the earthquakes could have been magnitude 6 or even larger. 0000013802 00000 n This would place them in the late Pleistocene, during the last North American ice age. 0000026672 00000 n It was one of many aftershocks to follow the 11 March Tōhoku earthquake, and the strongest to have its epicentre located inland. 0000014299 00000 n The New York-Alabama Lineament is a magnetic anomaly in the geology of eastern North America running from Alabama to New York. They included three initial main shocks of Mw magnitudes 6.4, 5.4, and 7.1, and many perceptible aftershocks, mainly within the area of the Naval Air Weapons Station China Lake. "Large earthquake paleoseismology in the East Tennessee seismic zone: Results of an 18-month pilot study", Recent Advances in North American Paleoseismology and Neotectonics East of the Rockies, Randel Tom Cox, Martitia P. Tuttle, Oliver S. Boyd, Jacques Locat. Figure 1 shows distributions of values used in the TIP and TVA studies, on the moment … Search for other works by this author on: Keen Geoserve, LLC, 325 East Vine Street, Dexter, Missouri 63841, USA, U.S. Geological Survey (Emeritus), 3415 W. County Road 50N, Rockport, Indiana 47635, USA. 0000018125 00000 n They remain the most powerful earthquakes to hit the contiguous United States east of the Rocky Mountains in recorded history. The geology of Alabama is marked by abundant geologic resources and a variety of geologic structures from folded mountains in the north to sandy beaches along the Gulf of Mexico coast. The earthquakes, as well as the seismic zone of their occurrence, were named for the Mississippi River town of New Madrid, then part of the Louisiana Territory and now within the U.S. state of Missouri. Your opinions are important to us. Bulletin of the Seismological Society of America, Geology at Every Scale: Field Excursions for the 2018 GSA Southeastern Section Meeting in Knoxville, Tennessee, Geometries and Mechanisms of Thrusting, with special reference to the Appalachians, The 2011 Mineral, Virginia, Earthquake, and Its Significance for Seismic Hazards in Eastern North America, Recent Advances in North American Paleoseismology and Neotectonics East of the Rockies, This site uses cookies. Notice, Smithsonian Terms of Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996-1410, USA. The lineament is defined by discontinuities in aeromagnetic measurements indicating an approximately 220-kilometre (140 mi) displacement of buried geologic structures along this line. The Eastern Tennessee Seismic Zone (ETSZ), also known as the East Tennessee Seismic Zone and the Southern Appalachian Seismic Zone, is a geographic band stretching from northeastern Alabama to southwestern Virginia that is subject to frequent small earthquakes.The ETSZ is one of the most active earthquake zones in the eastern … With a shallow focus of 13 km (8.1 mi), the earthquake was centred inland about 36 km (22 mi) west of Iwaki, causing widespread strong to locally severe shaking. 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"But we don't have enough data right now to say whether or not this is some kind of ephemeral or maybe periodic activity," he noted. 0000030666 00000 n The known faults in the ETSZ are generally ancient; no known active faults reach the surface. By using our site, you acknowledge that you have read and understand our Privacy Policy The 1986 Chalfant Valley earthquake struck southern Mono County near Bishop and Chalfant, California at 07:42:28 Pacific Daylight Time on July 21. 0000001520 00000 n Recently, public knowledge about the fault has increased, especially after the 1970s, when the fault's proximity to the Indian Point nuclear plant in New York was noted.

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