The CVSZ, the New Madrid seismic zone, and the central Oklahoma seismic zone (COSZ) are all bisected by major river systems. PLEASE NOTE: We are aware of an issue that keeps iOS10 Chrome users from reporting their location. [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. 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 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) (). 0 people just felt an earthquake. Earthquake case studies. Here, we explore the complex spatiotemporal patterns of intraplate seismicity using a 3D visco- 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. Did you? [58] The discovery of Holocene activity at the Meers fault was a surprise to scientists[71] and attracted the attention of geologists[72] after two publications in 1983 highlighted the young movements on this fault;[17] it is the best researched fault east of Colorado. There were no immediate reports of damage. [12][20] The scarp marks the Holocene section of the fault. Here, Levandowskiet al. 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. 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 west-northwest-trending rift appears to follow an older Proterozoic line of structural weakness in the crust. [35] Recent research has suggested that the whole fault may be of Quaternary age with little activity during the Pennsylvanian. 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.. [15] Unlike many other faults, there is no evidence of segmentation in the Meers fault. [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. Information on how to be prepared in case an earthquake hits here in Arkansas. [12] The dates have been obtained through radiocarbon dating on soil in trenches dug in the fault scarp[13] and of offset alluvium deposits. Where was the largest EQ's in the US? [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. What were the effects? Earthquakes with a magnitude of 2.5 or higher, All content submitted must be your original work. 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. 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. The New Madrid seismic zone is located in the northern part of what has been called the Mississippi embayment. [14] One interpretation is that the Meers fault is a "back-thrust" that dips northwards. 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. [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. [65] Other regional faults such as the Washita Valley fault which runs parallel to the Meers fault may also be capable of causing earthquakes. 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. [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. [1], In low sun-angle photography additional scarps and splays can be observed. 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. 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. Intraplate earthquakes also present significant seismic hazards, especially because they can affect densely populated regions with little preparation for seismic shaking. 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. 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. 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. 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 [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. [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. 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. 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 is currently no seismicity on the fault but it is considered an earthquake hazard. 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. [30] The development of the Meers fault may have been influenced by the South Oklahoma aulacogen. Meers Fault is a fault in Oklahoma that extends from Kiowa County to Comanche County. 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 … [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. 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