oklahoma intraplate seismic zone

[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. Earthquake case studies. The map below will update every minute and show all user reported earthquakes in the last 30 minutes. A hydrograph 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). The New Madrid seismic zone is located in the northern part of what has been called the Mississippi embayment. 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 [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. 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 … 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. [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. [12][20] The scarp marks the Holocene section of the fault. [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. Intraplate earthquakes (IPEs) result when the local stresses become comparable with their regional counterparts, i.e., hundreds of megapascals. The west-northwest-trending rift appears to follow an older Proterozoic line of structural weakness in the crust. 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. The CVSZ, the New Madrid seismic zone, and the central Oklahoma seismic zone (COSZ) are all bisected by major river systems. Tectonics , 16 , 585 –595. The Meers fault is part of a group of faults that lie between the Anadarko Basin and the Wichita Mountains. 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. 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. Intraplate earthquakes also present significant seismic hazards, especially because they can affect densely populated regions with little preparation for seismic shaking. [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? [9] It dips first northeastward[12] but deeper it becomes either vertical or down-to-the-southwest,[13] but certainly steep at depth. [51] In general, the movement direction of the Meers fault is contentious. [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. 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 … 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 [30] The development of the Meers fault may have been influenced by the South Oklahoma aulacogen. Educational resources concerning earthquakes. [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. [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. The red circles are earthquake locations from local seismic network analyses. 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. 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. intermediate-depth intraplate earthquakes, and a double seismic zone is observed5. 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. 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. [47] The underground rupture on the other hand might reach a length of 70 kilometers (43 mi). 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. 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