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 …  More fault movements occurred in the Permian and the Pleistocene although there are no post-Permian rock formations in the area that could allow an estimation of post-Paleozoic movements. The primary example is the New Madrid Seismic Zone (NMSZ, Figure 1b). It is marked by a 22â26 kilometers (14â16 mi) long conspicuous fault scarp but the fault extends beyond the ends of this scarp. 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 , 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. 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 … However, Pleistocene sediments and Holocene alluvium have been offset, indicating fault movement during this time. 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 CVSZ, the New Madrid seismic zone, and the central Oklahoma seismic zone (COSZ) are all bisected by major river systems. Arkansas Earthquake Archive 1699-2019. 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) â An earthquake with a 4.7 magnitude shook Malatya province in eastern Turkey on Friday, sending people pouring out into the streets in fear.  Other regional faults such as the Washita Valley fault which runs parallel to the Meers fault may also be capable of causing earthquakes. Taiwanâs 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. A hydrograph Here, Levandowskiet al.  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. The New Madrid seismic zone (NMSZ) within the Reelfoot rift (Fig.  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. , Alternatively, the fault movement could have occurred through aseismic creep as there is little evidence of strong ground shaking in the area as well as evidence against strong ground motion although the soils found close to the fault trace show evidence of fast movement.  One interpretation is that the Meers fault is a "back-thrust" that dips northwards.  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. It may have begun as a rift margin fault in the Proterozoic-Cambrian associated with the Southern Oklahoma Aulacogen 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) and the Meers Valley formed along the fault. Globally, most of the seismic energy release associated with IPEs occurs within old rifts which contain LSCs most favorable for …  The dates have been obtained through radiocarbon dating on soil in trenches dug in the fault scarp and of offset alluvium deposits. The Meers Fault runs along the northern side of Meers Valley through Comanche County and Kiowa County and close to Caddo County in an east-southeast to north-northwest direction.  Underground, the fault may be over 100 kilometers (62 mi) long. , A conspicuous 5-meter (16 ft) high and 26-kilometer (16 mi)â22-kilometer (14 mi) long fault scarp just north of the Wichita Mountains is noticeable on Google Earth; it has formed on the Holocene part of the fault and continues southeastwards in the form of more subtle scarps although it may not exactly coincide with the path of the fault. , The USGS national hazard map states that the Meers fault has a recurrence interval of 4,500 years but estimates range from 100,000 years to 1,300 years. , Reconstructions of the intensity of the Holocene earthquakes indicates magnitudes of Mw 6.75â7.25 with possibly similar intensities, with the terrain north of the fault being shifted upwards and leftwards relative to the terrain to its south; this latter movement and the position of the Meers fault are consistent with the tectonic stress pattern of North America which favours movement along the Meers fault.  The activity of the Meers fault and other seismicity has been related to a continent-spanning fault zone and there might be a relation to the Brevard Zone in Atlanta as well. 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. Here, we explore the complex spatiotemporal patterns of intraplate seismicity using a 3D visco- State seismologist Jake Walter spent time early in the coronavirus pandemic to focus on this big project. 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 erosion/sedimentation patterns and the path of drainages such as Canyon Creek may have been influenced by movement along the fault, and topographic ridges are offset. , The Meers fault is a reverse fault (at first it was interpreted to be a normal fault) with a straight path despite a variable topography; it probably does take the form of a broad dislocation rather than of a plane and its expression varies depending on the substrate rock. The magenta line shows the boundary of the Mississippi embayment structure that, … , The Meers fault is among the most prominent tectonic structures in the region. 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). 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?  Assessing the hazard potential for the Meers fault suffers from similar problems but it is considered the largest seismic hazard source of the central United States as it has the potential to cause large earthquakes and earthquakes in the central United States usually affect much larger regions than those of the western United States.  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 which intersects with and is also connected to the Meers fault. 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. What magnitude? The tectonic  The development of the Meers fault may have been influenced by the South Oklahoma aulacogen. 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 … ", "My Favorite Outcrop(s): An Imposter Exposed?  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