The New Madrid seismic zone is located in the northern part of what has been called the Mississippi embayment. [61], Judging earthquake hazards in the central and eastern United States is made hard by the scarcity of geological evidence of seismicity, the long timespans between earthquakes and the shortness of the historical record thereof. [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. ", "My Favorite Outcrop(s): An Imposter Exposed? [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. Taiwan’s Central Weather Bureau said the earthquake measured 6.7 and struck about 9:20 p.m. at a depth of 77 kilometers (48... LIBERTY, Mo. [11] Underground, the fault may be over 100 kilometers (62 mi) long. [3] The igneous rocks belong to the Amarillo-Wichita uplift and are much more magnetic than the carbonates; this has been used to trace the fault with aeromagnetic techniques although the igneous rocks also reduce its visibility in reflection seismology studies. 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. [34] The fault system, which also includes the Meers fault[35] as its southern margin,[36] was active during the Mississippian to Permian, generating a total offset of about 12 kilometers (7.5 mi). In contrast, the Semidi segment exhibits far sparser seismicity both at greater depths and within the plate boundary, even though great earthquakes historically occur here3 (Fig.1). 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. The major intraplate seismic zones are limited to specific segments and are not distributed along the lengths of the ancient structures. [12], Two to four earthquakes occurred during the Holocene in the last 6,000 years,[17] one of which occurred 1,100–1,300 years ago and the other 2,000–2,900 years ago. Relocated Hypocenters and Structural Analysis from Waveform Modeling of Aftershocks from the 2011 Prague, Oklahoma, Earthquake Sequence by Marius P. Isken* and Walter D. Mooney Abstract We present an analysis of aftershocks with M L >3 from the 2011 Prague, Oklahoma, earthquake sequence, an intraplate sequence of moderate-size earthquakes [56] Likewise, seismicity is scarce in the wider region[31] and photographic analysis has shown little evidence of recent fault movement in other faults of the Wichita fault system. Intraplate earthquakes also present significant seismic hazards, especially because they can affect densely populated regions with little preparation for seismic shaking. There is currently no seismicity on the fault but it is considered an earthquake hazard. [47] The underground rupture on the other hand might reach a length of 70 kilometers (43 mi). The New Madrid seismic zone (NMSZ) within the Reelfoot rift (Fig. (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. When? Seismic Risk of the Meers Fault, SW Oklahoma: A Hoary Giant or Great Imposter? Earthquakes with a magnitude of 2.5 or higher, All content submitted must be your original work. Southern Oklahoma has long been recognized as the home to a series of very large and complex intraplate structures that are exposed in the Wichita and Arbuckle Mountains. [18] In addition, earthquakes are often only weakly correlated to geological structures such as faults. [73], "A Robust Estimation of the 3-D Intraplate Deformation of the North American Plate From GPS", "Fault number 1031b, Meers fault, southeastern section", "THE BREVARD ZONE IN ATLANTA, GEORGIA AND THE MEERS FAULT OF SOUTHERN OKLAHOMA: CONJUGATE WRENCH FAULTS FORMED UNDER CONTRASTING TEMPERATURE CONDITIONS", 10.1130/0016-7606(1988)100<0392:SEOHFI>2.3.CO;2, "Probabilistic Seismic Hazard Assessment of the Meers Fault, Southwestern Oklahoma: Modeling and Uncertainties", "A petrographic study of igneous rock from three drill holes near the Meers Fault, Oklahoma", "Seismic Risk of the Meers Fault, SW Oklahoma: A Hoary Giant or Great Imposter? Information on how to be prepared in case an earthquake hits here in Arkansas. [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. [17] The scarp was described as a Permian fault scarp before Holocene activity was discovered[70] and made known by Gilbert 1983 and Donovan et al. A Meers Fault Outcrop in the Slick Hills of Oklahoma", "Possible Quaternary movement on the Meers Fault Southwestern Oklahoma", "The Slick Hills of Southwestern Oklahoma-Fragments of an aulacogen? Intraplate earthquakes occur far from tectonic plate boundaries and so it is vital to understand how and where they may happen. Here, we explore the complex spatiotemporal patterns of intraplate seismicity using a 3D visco- [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. Click the button on the right to let us know if you felt an earthquake. New Madrid seismic zone (NMSZ), the east Tennessee seis-mic zone (ETSZ), the Charleston seismic zone (CSZ), and the New England seismic zone (NESZ). [5] The fault scarp is located on private land;[6] the southeastern part runs through farmland and the northwestern part runs through hilly terrain. The Meers fault is part of a group of faults that lie between the Anadarko Basin and the Wichita Mountains. The existence of intraplate earthquakes remains a deep scientific mystery with strong societal implications that needs to be solved by innovative approaches. TAIPEI, Taiwan (AP) — A strong earthquake off the eastern coast of Taiwan shook the capital city of Taipei on Thursday night. What were the effects? 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. [16], A conspicuous[17] 5-meter (16 ft) high and 26-kilometer (16 mi)[18]–22-kilometer (14 mi) long fault scarp just north of the Wichita Mountains is noticeable on Google Earth;[17] it has formed on the Holocene part of the fault[18] and continues southeastwards in the form of more subtle scarps[12] although it may not exactly coincide with the path of the fault. These features are the result of early Paleo-zoic extension and late Paleozoic compression. 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 … [9] It dips first northeastward[12] but deeper it becomes either vertical or down-to-the-southwest,[13] but certainly steep at depth. Liu , M. , S. Stein , and H. Wang ( 2011 ). 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? Educational resources concerning earthquakes. The Meers Fault runs along the northern side of Meers Valley[1] through Comanche County and Kiowa County and close to Caddo County[2] in an east-southeast to north-northwest direction. Globally, most of the seismic energy release associated with IPEs occurs within old rifts which contain LSCs most favorable for … Insurance company can’t avoid having to defend an energy company’s involvement in class-action earthquake lawsuit, appeals court rules By Jack Money Business writer jmoney@oklahoman.com | Updated: Tue, Sep 29, 2020. Continuing high rates of small magnitude earthquakes, the great historical earthquakes of 1811-1812 and large paleoseismic earthquakes define the NMSZ as one of the major intraplate seismic zones of the world [Johnston & Schweig, 1996]. Strike-slip movements probably played a role both phases of deforma - tion. Walter and his fellow researchers at the Oklahoma... An insurance company policy’s boilerplate exclusionary language is the latest victim of salt-water induced earthquakes in Oklahoma. 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. Title: Intraplate Earthquakes Description: Intraplate Earthquakes Intraplate seismicity of the New Madrid seismic zone in the central USA superimposed on a topography map with warmer colors indicating higher elevations. [18] The Meers fault is the only Mid-Continent fault scarp[21] and has been called the "finest" such scarp east of the Rocky Mountains. State seismologist Jake Walter spent time early in the coronavirus pandemic to focus on this big project. [31], The Meers fault is among the most prominent tectonic structures in the region. Intraplate earthquakes (IPEs) result when the local stresses become comparable with their regional counterparts, i.e., hundreds of megapascals. [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. 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. 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. The New Madrid Seismic Zone, sometimes called the New Madrid Fault Line, is a major seismic zone and a prolific source of intraplate earthquakes in the southern and midwestern United States, stretching to the southwest from New Madrid, Missouri. Towns close to the fault are Cooperton, Meers, Apache, Fort Sill,[3] Treasure Island and Elgin;[4] Oklahoma State Highway 19, Oklahoma State Highway 115, Oklahoma State Highway 58 and U.S. Route 281 cross the fault[3] and Oklahoma State Highway 44 might do so as well. The CVSZ, the New Madrid seismic zone, and the central Oklahoma seismic zone (COSZ) are all bisected by major river systems. 2000 years of migrating earthquakes in North China: how earthquakes in midcontinents differ from those at plate boundaries. [9] The ratio of the horizontal to vertical motion is about 1.3–1.5[14] or about 2:1[12] although the amount of horizontal movement on the fault is controversial. PLEASE NOTE: We are aware of an issue that keeps iOS10 Chrome users from reporting their location. Meers Fault is a fault in Oklahoma that extends from Kiowa County to Comanche County. [15] Unlike many other faults, there is no evidence of segmentation in the Meers fault. [57], The region is part of the stable continent and away from plate boundaries and other tectonically active areas. By uploading any content to NewsOK.com, you agree to our, Offshore earthquake shakes buildings in Taiwan's capital, Wichita area feels 5 low-intensity earthquakes in 2 weeks, China, Nepal say Everest a bit higher than past measurements, Japan court revokes permits at 2 reactors over quake safety, Southeast Turkey shaken by 5.0 magnitude quake, Magnitude 4.7 quake hits eastern Turkey, no damage reported, 16 Albanians charged with murder over earthquake deaths, Oklahoma researcher turned to AI while hunting for quakes, Insurance company can’t avoid having to defend an energy company’s involvement in class-action earthquake lawsuit, appeals court rules. [51] In general, the movement direction of the Meers fault is contentious. The zone is the site of the four largest intraplate earthquakes in the United States, the 1811–1812 sequence with estimated magnitudes of 7.0 to 7.6 (49–51). [12] The dates have been obtained through radiocarbon dating on soil in trenches dug in the fault scarp[13] and of offset alluvium deposits. The Meers fault does not seem to be involved. [1], In low sun-angle photography additional scarps and splays can be observed. [3] The nature of the surrounding rocks also influences the expression of the Meers fault, as it has a more pronounced scarp in erosion-resistant rock units. [28], The fault separates Cambrian-Proterozoic[29] igneous rocks from thick[3] Cambrian-Ordovician age[30] carbonates to the northeast. Seismic hazard and risk assessment in the intraplate environment: The New Madrid seismic zone of the central United States Continental Intraplate Earthquakes: Science, Hazard, and Policy Issues Widespread groundwater-level offsets caused by the M w 5.8 … [33], All these faults lie in the area of the Frontal Wichita fault system, which is located between the Anadarko Basin to the north and the Amarillo-Wichita uplift to the south[3] and separates the two. [35], Reconstructions of the intensity of the Holocene earthquakes indicates magnitudes of Mw 6.75–7.25[18] with possibly similar intensities,[48] with the terrain north of the fault being shifted upwards and leftwards relative to the terrain to its south;[18] this latter movement[35] and the position of the Meers fault are consistent with the tectonic stress pattern of North America[7] which favours movement along the Meers fault. The New Madrid seismic zone, beneath the central Mississippi River valley, is undergoing considerable study as it is the most seismically active area in the eastern United States and also because it experienced at least three devastating earthquakes in 1811–1812 (Nuttli, 1982; Penick, 1981; Johnston, 1996; Johnston and Schweig, 1996; Tuttle et al., 2002) (). A hydrograph [18] In the wider area around the Meers fault such as in the Texas Panhandle, the Arbuckle Mountains and around Enola, Arkansas there is evidence of recent seismic and fault activity which may be part of a larger seismic zone. [1], The Meers fault is a reverse fault[7] (at first it was interpreted to be a normal fault[8]) with a straight path despite a variable topography;[9] it probably does take the form of a broad dislocation rather than of a plane[10] and its expression varies depending on the substrate rock. [35] Recent research has suggested that the whole fault may be of Quaternary age with little activity during the Pennsylvanian. Over the past few days, Oklahoma has been hit by a sequence of significant earthquakes, including a magnitude 5.6, the largest quake to hit Oklahoma in modern times: A magnitude-4.7 foreshock struck 20 miles northeast of Shawnee and 46 miles east of Oklahoma City on Saturday, November 5, at 2:12 a.m. local time at the epicenter. grating. Today, instrumental seismicity outlines four main arms that extend for more than 200 km from west of Memphis, Tennessee, into southern Missouri ( … MPa (0.1-1.0 bar) of pore-fluid overpressure (pressure above hydrostatic) to trigger an intraplate earthquake. The Osaka District... ISTANBUL (AP) — Turkey’s disaster authority and the U.S. Geological Survey say a 5.0 magnitude earthquake has struck Siirt in southeastern Turkey. [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. Tectonics , 16 , 585 –595. Information regarding earthquakes in Arkansas including types of faults magnitude and intensity scales, seismology, seismic waves, epicenters (New Madrid Seismic Zone and the Enola Swarms) and more. Arkansas Earthquake Archive 1699-2019. [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. Preliminary analysis of the stream gaging stations on rivers in and near the COSZ suggests that the earthquakes may be associated with the Canadian River system. [14] The fault may generate strong earthquakes in the future;[66] earthquakes with magnitudes Mw 7.5–8 might be possible on the Meers fault[67] and an earthquake similar to the Holocene ones would be felt over large parts of the continent, including Oklahoma and Texas,[54] with intensities comparable to these of the 1886 Charleston earthquake and 1811–12 New Madrid earthquakes. [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. [30] The development of the Meers fault may have been influenced by the South Oklahoma aulacogen. 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. [54], The USGS national hazard map states that the Meers fault has a recurrence interval of 4,500 years[44] but estimates range from 100,000 years to 1,300 years. Other areas, such as the Wabash Valley and East Tennessee Seismic zones also produce earthquakes on a regular basis. What magnitude? [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". The earthquakes that have been striking Oklahoma are intraplate earthquakes associated with stresses and faults in the interior of the plate. [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. The mechanics of these intraplate earthquakes remain poorly understood. The Mississippi embayment is a broad trough filled with marine sedimentary rocks about 50-100 millions years old and river sediments less than 5 millions years old. [38], The Meers fault has been in existence for most of the Phanerozoic. A high-resolution seismic-reflection survey over part of the Meers fault scarp in Comanche County, Oklahoma, provides an improved understanding of the shallow structure associated with the fault zone. The quake, which was centered in the town of Puturge, struck at... TIRANA, Albania (AP) — Albanian prosecutors indicted 16 investors, construction experts and local officials Friday on murder and other charges resulting from fatal building collapses after an earthquake a year ago. A quake with an... KATHMANDU, Nepal (AP) — China and Nepal jointly announced a new official height for Mount Everest on Tuesday, ending a discrepancy between the two nations. [21] Other faults in the area are the Blue Creek Canyon fault which is connected to the Meers fault at its northwestern end, the Broxton Fault Complex northeast and the Mountain View fault to the north[3] which intersects with[32] and is also connected to the Meers fault. Here, Levandowskiet al. 2020-12-07 07:32:32 UTC 2.1 magnitude, 4 km depth Alva, Oklahoma, United States 2.1 magnitude earthquake 2020-12-07 07:32:32 UTC at 07:32 December 07, 2020 UTC Locations north of the NMSZ, such as the closely … The Meers fault is part of a group of faults that lie between the Anadarko Basin and the Wichita Mountains.. For example, a major intraplate seismic zone may have existed along the MVG south of the NMSZ as suggested by extensive sandblow features produced by several large earthquakes (Cox et al., 2007); at this location, CCD may be associated with the intersection of the MVG with the Alabama‐Oklahoma transform fault (Thomas, 1991). [49], Alternatively, the fault movement could have occurred through aseismic creep as there is little evidence of strong ground shaking in the area[34] as well as evidence against strong ground motion[50] although the soils found close to the fault trace show evidence of fast movement. The west-northwest-trending rift appears to follow an older Proterozoic line of structural weakness in the crust. 0 people just felt an earthquake. [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. [17] It is possible that the fault rupture was limited by geological structures that occur at the northwestern end of the Meers fault[45] where it splays out. 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. 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. The red circles are earthquake locations from local seismic network analyses. The New Madrid Seismic Zone (/ ˈ m æ d r ɪ d /), 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.. 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