[57], The region is part of the stable continent and away from plate boundaries and other tectonically active areas. 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. [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. Locations north of the NMSZ, such as the closely … [9] It dips first northeastward[12] but deeper it becomes either vertical or down-to-the-southwest,[13] but certainly steep at depth. Today, instrumental seismicity outlines four main arms that extend for more than 200 km from west of Memphis, Tennessee, into southern Missouri ( … Meers Fault is a fault in Oklahoma that extends from Kiowa County to Comanche County. There is currently no seismicity on the fault but it is considered an earthquake hazard. Lithospheric strength and intraplate seismicity in the New Madrid seismic zone. The New Madrid seismic zone (NMSZ) within the Reelfoot rift (Fig. 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. [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). Despite the considerable variability in seismic … Globally, most of the seismic energy release associated with IPEs occurs within old rifts which contain LSCs most favorable for … [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. [13] Additional faults in the region are the Cement, the Cordell and the Duncan-Criner faults. 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. [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. 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. PLEASE NOTE: We are aware of an issue that keeps iOS10 Chrome users from reporting their location. Educational resources concerning earthquakes. That’s the result of a ruling handed down this month by Oklahoma’s Court of Civil Appeals, and that ruling could impact many dozens of energy companies being... Oklahoma is becoming a hotbed for earthquakes, and this special coverage page maps out every earthquake that happens in Oklahoma. You warrant that you are the sole owner of all rights in any content you submit, and that anyone appearing in your photos or videos has granted you permission to provide them to NewsOK.com. [35] The possibility that faulting continued for another 30 kilometers (19 mi) along its northwestern end is equivocal[13] with some evidence indicating that recent faulting was limited to Comanche County;[46] research published in 2019 indicates that the northwestern segment did not move during the 1,200 BP earthquake but was active in the 3,400–2,900 BP event. Earthquakes with a magnitude of 2.5 or higher, All content submitted must be your original work. Intraplate earthquakes (IPEs) result when the local stresses become comparable with their regional counterparts, i.e., hundreds of megapascals. The red circles are earthquake locations from local seismic network analyses. 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. There were no immediate reports of damage. The existence of intraplate earthquakes remains a deep scientific mystery with strong societal implications that needs to be solved by innovative approaches. [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. The map below will update every minute and show all user reported earthquakes in the last 30 minutes. The mechanics of these intraplate earthquakes remain poorly understood. [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. 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. [38], The Meers fault has been in existence for most of the Phanerozoic. [9] Finally ductile folding,[25] vegetation and landform variations have also been recognized on the Meers fault. Prosecutors in the city of Durres, one of the areas most-devastated by the... Oklahoma's chief earthquake researcher has developed cutting-edge software that uses machine learning to sniff out tiny tremors. [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. [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. 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). [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. Strike-slip movements probably played a role both phases of deforma - tion. 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. There was however, no immediate report of any damage or casualties. 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. 1983. Other areas, such as the Wabash Valley and East Tennessee Seismic zones also produce earthquakes on a regular basis. [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. Arkansas Earthquake Archive 1699-2019. [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. 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. The tectonic 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. [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". [42][12] The slip rate has been estimated to be 0.02 millimeters per year (0.00079 in/year), which is typical for intraplate faults. 1A inset) is defined by alignments of earthquake epicenters. ", "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). The Meers fault is part of a group of faults that lie between the Anadarko Basin and the Wichita Mountains. Other areas, such as the Wabash Valley and East Tennessee Seismic zones also produce earthquakes on a regular basis. 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]. Where was the largest EQ's in the US? Intraplate earthquakes occur far from tectonic plate boundaries and so it is vital to understand how and where they may happen. 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. (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. 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. [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. [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. Here, we explore the complex spatiotemporal patterns of intraplate seismicity using a 3D visco- intermediate-depth intraplate earthquakes, and a double seismic zone is observed5. 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. 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. [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. ", "My Favorite Outcrop(s): An Imposter Exposed? Early Cambrian intraplate magmatism in the Southern Oklahoma rift zone represents the largest known igneous event associated with the opening of the Iapetus Ocean along the southeastern margin of Laurentia. [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. 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. Liu , M. , S. Stein , and H. Wang ( 2011 ). An insurance company policy’s boilerplate exclusionary language is the latest victim of salt-water induced earthquakes in Oklahoma. [18] In addition, earthquakes are often only weakly correlated to geological structures such as faults. Washington, DC", https://en.wikipedia.org/w/index.php?title=Meers_Fault&oldid=977627584, Articles with unspecified earthquake magnitude and/or scale, Creative Commons Attribution-ShareAlike License, This page was last edited on 10 September 2020, at 00:34. TAIPEI, Taiwan (AP) — A strong earthquake off the eastern coast of Taiwan shook the capital city of Taipei on Thursday night. The Meers fault is part of a group of faults that lie between the Anadarko Basin and the Wichita Mountains.. [12] The dates have been obtained through radiocarbon dating on soil in trenches dug in the fault scarp[13] and of offset alluvium deposits. However, Pleistocene sediments and Holocene alluvium have been offset, indicating fault movement during this time. [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. [35] Recent research has suggested that the whole fault may be of Quaternary age with little activity during the Pennsylvanian. A hydrograph [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. [39] More fault movements occurred in the Permian and the Pleistocene[13] although there are no post-Permian rock formations in the area that could allow an estimation of post-Paleozoic movements. [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. [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. Tectonics , 16 , 585 –595. 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). State seismologist Jake Walter spent time early in the coronavirus pandemic to focus on this big project. Intraplate earthquakes also present significant seismic hazards, especially because they can affect densely populated regions with little preparation for seismic shaking. [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. New Madrid seismic zone (NMSZ), the east Tennessee seis-mic zone (ETSZ), the Charleston seismic zone (CSZ), and the New England seismic zone (NESZ). 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. [51] In general, the movement direction of the Meers fault is contentious. What were the effects? 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 … [11] Underground, the fault may be over 100 kilometers (62 mi) long. 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. [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. The earthquakes that have been striking Oklahoma are intraplate earthquakes associated with stresses and faults in the interior of the plate. Here, Levandowskiet al. [12][20] The scarp marks the Holocene section of the fault. [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. 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. 0 people just felt an earthquake. [12] Both the Wichita Mountains thrust[17] and possibly a second fault are linked with the Meers fault,[37] which is the only fault in the Wichita fault system with Holocene activity. 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? [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. [15] Unlike many other faults, there is no evidence of segmentation in the Meers fault. 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 … [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. Earthquake case studies. 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 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. The primary example is the New Madrid Seismic Zone (NMSZ, Figure 1b). 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 [65] Other regional faults such as the Washita Valley fault which runs parallel to the Meers fault may also be capable of causing earthquakes. What magnitude? The major intraplate seismic zones are limited to specific segments and are not distributed along the lengths of the ancient structures. [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. [1], In low sun-angle photography additional scarps and splays can be observed. 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). 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 west-northwest-trending rift appears to follow an older Proterozoic line of structural weakness in the crust. [47] The underground rupture on the other hand might reach a length of 70 kilometers (43 mi). 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. When? The New Madrid seismic zone is located in the northern part of what has been called the Mississippi embayment. grating. United States", https://www.researchgate.net/publication/236473980_Investigation_of_the_Meers_fault_in_southwestern_Oklahoma, 10.1130/0016-7606(1990)102<0001:SATOHS>2.3.CO;2, "The Meers Fault: tectonic activity in southwestern Oklahoma. 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) (). 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. 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. 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