[12][20] The scarp marks the Holocene section of the fault. The major intraplate seismic zones are limited to specific segments and are not distributed along the lengths of the ancient structures. Here, Levandowskiet al. [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. 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. 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. Intraplate earthquakes occur far from tectonic plate boundaries and so it is vital to understand how and where they may happen. TAIPEI, Taiwan (AP) — A strong earthquake off the eastern coast of Taiwan shook the capital city of Taipei on Thursday night. State seismologist Jake Walter spent time early in the coronavirus pandemic to focus on this big project. There were no immediate reports of damage. Earthquake case studies. The earthquakes that have been striking Oklahoma are intraplate earthquakes associated with stresses and faults in the interior of the plate. [31], The Meers fault is among the most prominent tectonic structures in the region. The west-northwest-trending rift appears to follow an older Proterozoic line of structural weakness in the crust. The mechanics of these intraplate earthquakes remain poorly understood. [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. [9] Finally ductile folding,[25] vegetation and landform variations have also been recognized on the Meers fault. What were the effects? [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. 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 [15] Unlike many other faults, there is no evidence of segmentation in the Meers fault. 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. [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. Where was the largest EQ's in the US? The CVSZ, the New Madrid seismic zone, and the central Oklahoma seismic zone (COSZ) are all bisected by major river systems. [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 Meers fault does not seem to be involved. 1A inset) is defined by alignments of earthquake epicenters. Despite the considerable variability in seismic … The map below will update every minute and show all user reported earthquakes in the last 30 minutes. [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. 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. 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. [11] Underground, the fault may be over 100 kilometers (62 mi) long. 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. 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 … grating. Seismic Risk of the Meers Fault, SW Oklahoma: A Hoary Giant or Great Imposter? 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. 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. [38], The Meers fault has been in existence for most of the Phanerozoic. Liu , M. , S. Stein , and H. Wang ( 2011 ). A hydrograph 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. The tectonic 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]. [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 red circles are earthquake locations from local seismic network analyses. [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. Today, instrumental seismicity outlines four main arms that extend for more than 200 km from west of Memphis, Tennessee, into southern Missouri ( … [9] It dips first northeastward[12] but deeper it becomes either vertical or down-to-the-southwest,[13] but certainly steep at depth. Tectonics , 16 , 585 –595. Globally, most of the seismic energy release associated with IPEs occurs within old rifts which contain LSCs most favorable for … Other areas, such as the Wabash Valley and East Tennessee Seismic zones also produce earthquakes on a regular basis. [18] In addition, earthquakes are often only weakly correlated to geological structures such as faults. [14] One interpretation is that the Meers fault is a "back-thrust" that dips northwards. [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. MPa (0.1-1.0 bar) of pore-fluid overpressure (pressure above hydrostatic) to trigger an intraplate earthquake. Here, we explore the complex spatiotemporal patterns of intraplate seismicity using a 3D visco- PLEASE NOTE: We are aware of an issue that keeps iOS10 Chrome users from reporting their location. [65] Other regional faults such as the Washita Valley fault which runs parallel to the Meers fault may also be capable of causing earthquakes. [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). An insurance company policy’s boilerplate exclusionary language is the latest victim of salt-water induced earthquakes in Oklahoma. [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. [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. [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. There was however, no immediate report of any damage or casualties. 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. Information on how to be prepared in case an earthquake hits here in Arkansas. [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. 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