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[64], The fault was discovered during field work in the 1930s[68]–1940s[39] and is named after the town of Meers; previously it was known as the "Thomas fault"[21] after a ranch named George Thomas Ranch[69] and then as the "Meers Valley fault". As the rate of earthquakes have been increasing in the New Madrid Seismic Zone and in other parts of the Central United States, such as in Oklahoma, there are concerns that intraplate tectonic pressure may be driving these trends. The earthquakes that have been striking Oklahoma are intraplate earthquakes associated with stresses and faults in the interior of the plate. o Occurred in the New Madrid Seismic zone in Missouri Dec 16, 1811 Arkansas 8.1 January 23, 1812 Missouri 7.8 February 7, 1812 Missouri 8.0 o MMI of XI at epicenter, severe damage What is the recurrence interval for great EQ's in this region? The primary example is the New Madrid Seismic Zone (NMSZ, Figure 1b). (AP) — Five low intensity earthquakes have rattled part of the Wichita area since Thanksgiving, but a Kansas expert on seismic activity says residents of the state's largest city should not be overly concerned about a larger, more destructive quake occurring there. [43], The Meers fault is the only fault on Oklahoma which has generated a rupture on the surface,[44] resulting in about 5 meters (16 ft) of vertical offset[34] over a 43 kilometers (27 mi) long distance. [13] The erosion/sedimentation patterns[22][23] and the path of drainages[10] such as Canyon Creek may have been influenced by movement along the fault,[24] and topographic ridges are offset. The major intraplate seismic zones are limited to specific segments and are not distributed along the lengths of the ancient structures. 1A inset) is defined by alignments of earthquake epicenters. The Disaster and Emergency Management Authority, or AFAD, said Thursday there were no immediate reports of casualties or damage from the quake that... ANKARA, Turkey (AP) — An earthquake with a 4.7 magnitude shook Malatya province in eastern Turkey on Friday, sending people pouring out into the streets in fear. [12] The dates have been obtained through radiocarbon dating on soil in trenches dug in the fault scarp[13] and of offset alluvium deposits. Despite the considerable variability in seismic … The New Madrid seismic zone is located in the northern part of what has been called the Mississippi embayment. [31], The Meers fault is among the most prominent tectonic structures in the region. The new height of the world's highest peak is 8,848.86 meters (29,031.7 feet), which is slightly more than Nepal’s previous measurement and... TOKYO (AP) — A Japanese court on Friday revoked the operating permits of two nuclear reactors for having inadequate earthquake safeguards, a ruling that challenges safety assessments conducted by the nuclear regulator and could influence the outcome of other court cases. [51] In general, the movement direction of the Meers fault is contentious. ", "My Favorite Outcrop(s): An Imposter Exposed? Andrew Cullen / Warwick Energy & University of Oklahoma STATEMENT of the PROBLEM: The southern edge of the Anadarko basin in SW Oklahoma is defined by a regional fault system that records Pennsylvanian-aged inversion of a failed Cambrian intra-continental rift; an aulacogen formed during the break-up of … The CVSZ, the New Madrid seismic zone, and the central Oklahoma seismic zone (COSZ) are all bisected by major river systems. Did you? [64] In particular, it indicates that the Mid-Continent is not free of earthquakes and that the absence of recent seismicity does not rule out the presence of active faults. TAIPEI, Taiwan (AP) — A strong earthquake off the eastern coast of Taiwan shook the capital city of Taipei on Thursday night. We present a new hypothesis that major intraplate seismic zones are restricted to places where concentrated crustal deformation (CCD) is overprinted on large‐scale basement structures. The tectonic [19] Because the scarp is not present along the entire length of the fault, it is subdivided in a southeastern section in Comanche County and a northwestern section in Kiowa County, with only the southeastern section featuring a scarp. The New Madrid Fault Zone, 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. [40] During the history of the fault considerable uplift took place on its southern side[31] while the recent movement has generated an opposite movement. Click the button on the right to let us know if you felt an earthquake. The New Madrid fault system was responsible for the 1811–12 New Madrid earthquakes, an intense intraplate earthquake series that began with an initial earthquake of moment magnitude 7.5–7.9 on December 16, 1811, and was followed by a moment magnitude 7.4 aftershock on the same day.They remain the most powerful earthquakes to hit the contiguous United States east of the Rocky … What magnitude? There is currently no seismicity on the fault but it is considered an earthquake hazard. It may have begun as a rift margin fault in the Proterozoic-Cambrian[13] associated with the Southern Oklahoma Aulacogen[39] but its maximum activity took place during the Mississippian and Permian when the Wichita Mountains and the Slick Hills were offset along it by about 2 kilometers (1.2 mi)[13] and the Meers Valley formed along the fault. [26] In some rock formations faulting has mainly led to warping, instead of brittle displacements[27] and in several sites evidence of faulting appears to be concealed by floodplain sedimentation. When? Where was the largest EQ's in the US? MPa (0.1-1.0 bar) of pore-fluid overpressure (pressure above hydrostatic) to trigger an intraplate earthquake. [52], The Meers fault presently is largely[14][53] aseismic, with no earthquakes recorded along its Holocene trace[18] or any evidence of aseismic creep[54] although minor seismicity has been recorded[55] and a M4.2 earthquake close to Lawton in 1998 is close to the southeastern end of the Meers fault. Students, colleagues and I have been exploring a variety of issues related to the New Madrid seismic zone in the central US and similar regions of continental intraplate earthquakes. intermediate-depth intraplate earthquakes, and a double seismic zone is observed5. Other areas, such as the Wabash Valley and East Tennessee Seismic zones also produce earthquakes on a regular basis. 1983. Educational resources concerning earthquakes. Globally, most of the seismic energy release associated with IPEs occurs within old rifts which contain LSCs most favorable for … The observed seismicity shows both spatial clustering in seismic zones and scattering across large plate interiors, temporal clustering followed by long periods of quiescence, and migration of seismicity from one seismic zone to another. [65] Other regional faults such as the Washita Valley fault which runs parallel to the Meers fault may also be capable of causing earthquakes. [14] One interpretation is that the Meers fault is a "back-thrust" that dips northwards. [35] Additional faulting appears to have occurred over 12,000 years ago, but evidence thereof was partly eroded away during a time of a wetter climate[41] and prior to the Holocene the fault might have been inactive for 100,000–130,000 years. [59] The activity of the Meers fault and other seismicity has been related to a continent-spanning fault zone[60] and there might be a relation to the Brevard Zone in Atlanta as well. The Meers fault does not seem to be involved. ", "The Meers fault scarp, southwestern Oklahoma", "Neotectonic and Paleoseismic Analysis of the Northwest Extent of Holocene Surface Deformation along the Meers Fault, OklahomaNeotectonic and Paleoseismic Analysis of the Northwest Extent of Holocene Surface Deformation", 10.1130/0016-7606(1995)107<0098:SCOHRO>2.3.CO;2, "Investigation of the Meers fault in southwestern Oklahoma (NUREG/CR--4937). [58] Earthquakes in Oklahoma have been observed in the areas of the southern Oklahoma aulacogen and of the Amarillo-Wichita uplift; in southwestern Oklahoma they are rare and of moderate intensity. These features are the result of early Paleo-zoic extension and late Paleozoic compression. The magenta line shows the boundary of the Mississippi embayment structure that, … Meers Fault is a fault in Oklahoma that extends from Kiowa County to Comanche County.It is marked by a 22–26 kilometers (14–16 mi) long conspicuous fault scarp but the fault extends beyond the ends of this scarp. [5] The fault scarp is located on private land;[6] the southeastern part runs through farmland and the northwestern part runs through hilly terrain. Other areas, such as the Wabash Valley and East Tennessee Seismic zones also produce earthquakes on a regular basis. [62] Assessing the hazard potential for the Meers fault suffers from similar problems[44] but it is considered the largest seismic hazard source of the central United States[63] as it has the potential to cause large earthquakes[31] and earthquakes in the central United States usually affect much larger regions than those of the western United States. The New Madrid seismic zone (NMSZ) within the Reelfoot rift (Fig. The central Virginia seismic zone (CVSZ), New Madrid, MO, seismic zone, and the central Oklahoma intraplate seismic zone are all bisected by major river systems. The red circles are earthquake locations from local seismic network analyses. Meers Fault is a fault in Oklahoma that extends from Kiowa County to Comanche County. Liu , M. , S. Stein , and H. Wang ( 2011 ). While the fault was active during the Permian-Cambrian, movement possibly accompanied by earthquakes took place during the Holocene and formed the fault scarp, with one earthquake occurring less than 2,000 years ago. There was however, no immediate report of any damage or casualties. The mechanics of these intraplate earthquakes remain poorly understood. 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oklahoma intraplate seismic zone