The probability of reverse faulting is theoretically high. Those mountains are obviously no longer here, however, the Humboldt Fault Line that created the mountain range is still active today. The uplift in Nebraska-Kansas is a buried, high-relief basement block, bounded on the east by the near-vertical, 2500-ft Humboldt (Nemaha) fault. Recent microearthquake locations and additional historical records indicate that the larger historical epicenters may be associated with the Humboldt fault zone, which forms the eastern boundary of the Nemaha ridge. This Oklahoma state location article is a stub. Merriam (1963) noted that the faults were likely both normal and reverse, but little note was taken of that description at that time. Gay makes several concluding points that are germane to this discussion. Dextral strike-slip created NE-SW wrench faults which created numerous small hydrocarbon traps in small up- and down-warps in the Paleozoic strata. Manhattan is near the Nemaha Ridge, a long anticline structure that is riddled with faults. The influence of the Nemaha Ridge on present drainage networks appears significant. It is a buried structural zone associated with a granite high in the Pre-Cambrian basement that extends from approximately Omaha, Nebraska to Oklahoma City, Oklahoma. 10), and uses the same failure planes. Examples: NFL, NASA, PSP, HIPAA. The north portion of the eastern fault system in northeastern Kansas has been referred to as the Humboldt fault (Condra, 1927; Jewett, 1951), but segments of the fault system are traceable from north to south across the entire state. Carr et al. Many believe it’s the fracking along the Oklahoma Kansas state line. The line of section is east-west, the dip is to the apparent south. Review of the Nemaha Ridge: A New Look at an Old Structure The Nemaha "Mountains" (Moore and Haynes, 1917; Moore, 1918) are a buried range of the Ancestral Rocky Mountains in eastern Kansas. Feb. 12, 2004. Abbreviation to define. Wichita is just west of a “major fault system” known as the Nemaha Ridge or the Humboldt Fault that runs through the center of North America, according to Wichita State University’s geology department. A larger version of this figure is available. location of the Nemaha Ridge. The influence of the Nemaha Ridge on present drainage networks appears significant. You can help Wikipedia by expanding it. Vertical exaggeration is 1:47. Some of these cross faults have a vertical component resulting in knobs or monadnocks along the crestal trend. A strong earthquake along the Humboldt Fault Zone and particularly the Nemaha Ridge in the future could pose a threat to the Tuttle Creek Reservoir, if the dam's walls break. The Nemaha Ridge is composed of a number of crustal blocks typically 3 to 5 miles (5 to 8 km) wide and 5 to 20 miles (8 to 32 km) long. location of the Humboldt Fault Line. We have previously discussed the possible origins of the thrusts, but the upthrust horst created by these faults almost specifies that the origin must be crustal shortening owing to the stress field changing from extension to compression. Seismic and geotechnical Seismic and geotechnical and instrumentally recorded microseismicity in eastern Kansas and Missouri have been attributed to the movement of the Nemaha Ridge and Humboldt fault (NRHF). The Humboldt Fault had the largest earthquake in Kansas history with the 1867 Manhattan, Kansas earthquake. Structure-contour maps prepared of the top of the Viola Formation (Ordovician), the base of the Pennsylvanian, and the top of the Oswego Formation (Middle Pennsylvanian) reveal a complex fault pattern associated with the Nemaha Uplift. Wichita is just west of a “major fault system” known as the Nemaha Ridge or the Humboldt Fault that runs through the center of North America, according to Wichita State … Vertical displacement, the sense of which Find. If there were travelers in eastern Kansas during the exposure of these mountains in the Pennsylvanian, the mountains would appear much as the present-day Front Range and Rocky Mountain peneplain do today to travelers to Colorado Springs and Denver. (1995) document a reverse fault along the southwestern margin of the Central Kansas uplift in the Hampton field, with a vertical displacement of 100-150 m (328-492 ft). An example of such deformation is the Nemaha Ridge in Nebraska, Kansas, and Oklahoma. Associated with the Nemaha Ridge is the Humboldt Fault system, a series of normal faults that trends across Nebraska and Kansas in a complex fashion (i.e., they're not just a single fault… The zone varies in width from about 4 to 15 mi, with anastomosing patterns; it is commonly a single fault in central Oklahoma. High-resolution seismic-reflection data allowed delineation of complex structural features associated with multiple episodes of faulting, uplift, and erosion beneath the Lyman-Richey Sand and Gravel Plant #8 located at the northern extreme of the Nemaha Ridge and Humboldt fault system in east-central Nebraska immediately north of Plattsmouth, Nebraska, in Cass … The Humboldt Fault was shown to breach the surface in the Fourmile Creek drainage basin near Bern, Kansas, offsetting Permian and Pennsylvanian beds by 54 to 74 m. Steep aeromagnetic and gravity gradients are superimposed over the trace of the Humboldt Fault zone and are likely related to it. It is difficult to visualize the rest of Kansas being dropped down relative to the Nemaha. It is not possible to accurately date the rifting, as outlined previously. location of earthquakes within the last 5 years in Nebraska . Along the Nemaha Ridge is a se­ries of faults re­ferred to as the "Nemaha Fault Zone". 1). They also illustrate the Precambrian precursor structure. Haraldson et al. He extended his study into Oklahoma, where the Nemaha structure is less apparent at the Precambrian/Phanerozoic surface. Drawing Draw a picture showing: Nebraska, Kansas and Oklahoma. The observations and correlations of that time are valid today, but now fit into a unified theory of earth tectonics, plate tectonics, not yet known then. Manhattan is near the Nemaha Ridge, a long anticline structure that is bounded by several faults. Link to the article about the anticline. Gay (1999) argues in his abstract that the Nemaha is a "pop-up" structure and that back thrusts are to be expected. Newell also suggests that there is left-lateral motion along the Pratt anticline that is a relict of the Midcontinent Rift, and thus the Pratt structure may be a remnant portion of the western margins of that zone. [2] However, the north-central part of the state, particularly Riley and Pottawatomie counties, is the most prone to earthquakes. The ridge is composed of Precambrian granitic rocks. Gay also believes that the east-bounding fault is steeply dipping near the surface, but is a listric fault that dips much less steeply with depth. Lee further describes a series of small movements along the fault system, starting in pre-Pennsylvanian time with truncated Mississippian rocks, and abrupt thickness changes in the Cherokee section of at least 900 ft (Lee, 1943, p. 124). (1989), interpreting a seismic line across the Lyons anticline in Rice County (at the eastern end of the Central Kansas uplift), suggest that the feature had a Keweenawan history as a broad symmetrical feature, a pre-Chattanooga movement, and a major late Mississippian or early Pennsylvanian deformation. The ridge is associated with the seismically active Humboldt Fault zone. It is the hypothesis of this paper that the Nemaha uplift is a reverse-faulted, perhaps thrust-faulted, structure, with the fault planes on the eastern margin dipping west. You can help Wikipedia by expanding it. The New Madrid Fault Zone, on the other hand, has a greater destructive potential. Historical felt earthquakes and instrumentally recorded microseismicity in eastern Kansas and western Missouri have been attributed to the movement of the Nemaha Ridge and Humboldt fault zone (NRHF). The current elevation difference on the Precambrian surface between the remnant peaks and the valley below and to the east is over 3,300 ft in Nemaha County and over 2,300 ft in Wabaunsee and Pottawatomie counties (Cole, 1976). location of earthquakes within the last 5 years in Nebraska . Numerous examples of reverse faults in Kansas are documented in the literature, most associated with the Midcontinent Rift and the Nemaha. The Nemaha "Mountains" (Moore and Haynes, 1917; Moore, 1918) are a buried range of the Ancestral Rocky Mountains in eastern Kansas. For a quiet cratonic region, Kansas has had an active tectonic history. http://www.kgs.ku.edu/Current/2004/Gerhard/07_nemaha.html VOTE RED! Merriam considers that it was more likely a range of lower-lying hills and ridges, inferring that sedimentation of debris eroded from the hills (mountains) filled the valleys as the range was elevated, subduing the topographic relief. Discussion follows. delineate the structural complexities of the Humboldt Fault/Nemaha Ridge near their convergence and intersection with the Midcontinent Rift (Midcontinent Geophysical Anomaly, MGA) in east-central Nebraska. [1]Kansas is not particularly earthquake prone, ranking 45th out of 50 states by damage caused. Earthquake epicenters in Kansas are clustered about the Nemaha (Steeples, 1996). (1989), showing geometric sequence of extensional events that resulted in the rift. Woelk and Hinze (1995) illustrate an interpretation of the rift in cross section that is thrust faulted on both sides (their fig. Recent seismic studies at the Kansas Geological Survey have revealed a complex array of faulted and folded structures in the vicinity of the Humboldt fault zone (the eastern flank of the Nemaha Ridge). Along its length, the Nemaha is broken by cross faults and apparent shears of northwest trend, some of which control the geometry of the Central Kansas uplift (Cole, 1976) (plate 1). Tweet. part of Kansas there is the Humboldt fault though the effects of faulting are present all through the state (Condra, 1927; Jewett, 1951). The principal boundary feature between the two basins is the Nemaha Ridge, a linear feature thatextends from near Omaha, Nebraska, to near Oklahoma City, Oklahoma. 16), as has been the work of Berendsen and Blair (1986). Thrusting in the rift (as earlier described) is of special interest here because the rift thrusts may be precursors to Paleozoic reverse faulting. WICHITA, Kan. — … The ridge is composed of Precambrian granitic rocks. Earthquake data: I felt this quake. dominated by the Nemaha Ridge and Humboldt fault zone. Recent microearthquake locations and additional historical records indicate that the larger historical epicenters may be associated with the Humboldt fault zone, which forms the eastern boundary of the Nemaha ridge. He argues, rightfully, that the tectonic origin of the Nemaha is in the Ancestral Rocky Mountain orogenesis, although he fails to relate that activity to the overall compressional regime of the Appalachian-Ouachita-Marathon deformation and the much earlier formation of the Midcontinent Rift System. There are several hills of a few hundred feet on that surface, in Marshall, Riley, and Marion counties (Cole, 1976), possible remnants of older topography. Figure 15--Location of known reverse faulting in Kansas along or associated with the Midcontinent Rift. Gay interpreted 4 mi (6 km) of offset to have occurred contemporaneously with the uplift of the Nemaha. It happened near the town of Wamego and was estimated at about 5.5 on the Richter scale. left-lateral offset in central eastern Kansas along the Nemaha is an important data set to establish the theoretical left-lateral motion (fig. 11). The origin of the Nemaha uplift has been attributed by Berendsen and Blair (1986) to left-lateral wrench fault movement as a crustal response Again, the most active spot is the Nemaha Ridge. 15). It is also associated with the Proterozoic Midcontinent Rift System, which extends into northern Kansas about fifty miles west of the Nemaha. east-bounding fault system of the old Nemaha ridge. The Humboldt Fault or Humboldt Fault Zone, is a normal fault or series of faults, that extends from Nebraska southwestwardly through most of Kansas. Midcontinent Rift System; Nemaha Ridge; Related Research Articles the humboldt fault zone, running along the nemaha ridge. to industry. First, what is an anticline? You can help Wikipedia by expanding it. The 2). This demonstration of fault complexity is one of the few examples of lateral fault movement in Kansas. Based on present topographic expression, the Nemaha is apparently scissored, hinging in northern or central Oklahoma, and having maximum displacement in northern Kansas and southeastern Nebraska, where Carlson (2001) shows it to terminate against successor structures to the Penokean Orogen. Figure 13 portrays a compressional reconstruction of the rift. Prev Page--Petroleum Implications || That implies that the dip of the thrust averages about 15%. Other Resources: Acronym … The Nemaha Ridge (also called the Nemaha Uplift and the Nemaha Anticline) is located in the Central United States. Prev Page--Petroleum Implications || Individual pools are separated by cross faults that create closures. The geometry of the system and the fact that the Nemaha appears to have movements affecting sedimentation and erosion during the lower Paleozoic strongly suggest that the Nemaha has origin in the same tectonic regime as the original Midcontinent Rift System. tectonic zone (MBTZ) are labeled. Kansas is not known for earthquake activity, but an earthquake could occur at any time. Those mountains are obviously no longer here, however, the Humboldt Fault Line that created the mountain range is still active today. Nemaha Ridge/Humboldt fault system and strike change in the Midcontinent Geophysical Anomaly (MGA) can be seismically correlated from the southern boundary of the Lyman-Richey Plant, across the Platte River to La Platte Road. In NE Kansas, the east side of the ridge is the vertical Humboldt fault that drops the Pre-Cambrian surface 2,500′ down to the east. Figure 12--Detail of COCORP seismic section across the Midcontinent Rift System, showing western east-dipping thrust fault. The Humboldt Fault or Humboldt Fault Zone, is a normal fault or series of faults, that extends from Nebraska southwestwardly through most of Kansas. west of Nemaha Ridge or the Humboldt Fault that runs through the center of North America. His example of a 6-km (4-mi.) So the question. Figure 14--Topographic profile of the Precambrian/Phanerozoic surface along a line between R. 10 and 11 S., in Geary and Waubunsee counties. The Nemaha Uplift is a ~400 mile NNE-SSW tear in the crust running from Omaha to Oklahoma City. Roehl et al. Recent seismic studies at the Kansas Geological Survey have revealed a complex array of faulted and folded structures in the vicinity of the Humboldt fault zone (the eastern flank of the Nemaha Ridge). Menu Search "AcronymAttic.com. Anticline defined . 2020, America's New Civil War. The Nemaha Ridge in Kansas and Nebraska, associated with the Humboldt Fault, is characterized by numerous small earthquakes that release stresses before they build to dangerous levels. Significant thrust faulting has been interpreted in the rift system by Woelk and Hinze (1995). bounded on the east by a major fault system, the Humboldt fault zone (Jewett, 1951; Berendsen and Blair, 1986), and by collateral faults, which impinge the Thurman-Redfield fault zone of the Mid-Continent rift to the north and the Pauls Valley uplift (fig. Executive Summary. The shape of the Nemaha in cross section (along the boundary between R. 10 and 11 S.) shows the geometry of the block and its western complementary platform (fig. Wichita is just west of a “major fault system” known as the Nemaha Ridge or the Humboldt Fault that runs through the center of North America, according to Wichita State University’s geology department. Sharp changes in the structural attitude of contours in the basinal areas east of the Nemaha Uplift were also thought to reflect faulting. Berendsen and Blair (1986) have argued that the Nemaha may be a sinistral (left-lateral) feature. location of the Humboldt Fault Line. Reconstruction of the Midcontinent Rift based on the schematic cross sections of Serpa et al. He correlated it with gravity anomalies from Oklahoma's Anadarko basin to Lake Superior, a system now known as the Midcontinent Rift System, but theorized that this was an intracontinental "tectogene." A normal, or dip-slip fault, it is responsible for at least several small tr… Further, there is the possibility that antithetic and back thrusting may occur on the western margins of the Nemaha and that these structures may also prove productive, if charged. A drilling program intended to explore for high quality limestone necessary for milling cement encountered an unexpected This suggests continued and persistent activity from the origin of the feature through to at least Desmoinesian time, when the present subsurface topography of the Nemaha was established. 9, reproduced here as fig. Using velocities of 5.5 km/sec for basalts, and 4.3 km/sec for well-indurated sandstones, and assuming that 50% of the section is each, the vertical displacement is about 1.23 km, or 1 mi. Additional link to the article. It is a underground mountain range made up of granite. This article about a specific United States geological feature is a stub. location of the Humboldt Fault Line. The data supporting that statement are the presence of eastward-dipping thrusts along the McPherson anticline (Voshell anticline) in McPherson County so well documented by Newell and Hatch (1999). The complex fault system that bound the ridge is still active today, especially the Humboldt fault zone that forms the eastern boundary of the Nemaha Ridge. Web version Sept. 15, 2004 15). They document both reverse and right-lateral movement along the main bounding fault, with a vertical throw of up to 400 ft (125 m). The principal boundary feature between the two basins is the Nemaha Ridge, a linear feature that extends from near Omaha, Nebraska, to near Oklahoma City, Oklahoma. Humboldt zone in the northern part of the state and draping of sediments over deeper faults is inferred toward the south. The system commonly has been portrayed as a series of normal faults (Kansas Geological Survey, 2000, for instance; Burchett et al., 1983). Except for the Nemaha structure, the Precambrian/Phanerozoic surface of the Midcontinent Rift System is of generally low relief. Merriam (1963) noted that there were high-angle reverse faults and normal faults along the margin of the Nemaha. The BMTZ is continuous with mag- Humboldt Fault Zone and Nemaha Ridge in netic lineaments e-e' and d-d' of Hilden- eastern Kansas is the site of the strongest brand, Kane, and Hendricks (1982). The Nemaha Ridge (also called the Nemaha Uplift and the Nemaha Anticline) is located in the Central United States. Next Page--Petroleum Potential. Wichita is near the Nemaha Ridge, or Humboldt Fault line, and more than a dozen earthquakes have been recorded in the area since Thanksgiving.The … Van Schmus (1992) has argued that there is reversal of stratigraphic section in the rift and that it is the result of thrust faulting. 1931 - scientific article about the table rock anticline. It hosts the Humboldt Fault Zone, which, in addition to serving as the range's easternmost boundary, has produced a large portion of the state's earthquakes. It happened near the town of Wamego and was estimated at about 5.5 on the Richter scale. The ridge was formed about 300 million years ago and is bounded by faults that are still active today, especially the Humboldt fault zone that forms the eastern boundary of the Nemaha Ridge and passes near Wamego, east of Manhattan, and El Dorado, east of Wichita. The rift appears to have undergone repeated deformation (Serpa et al., 1989) (fig. Figure 11--Diagrammatic cross section across the Midcontinent Rift System, showing thrust faults along the west and west sides of the rift. The area is not considered a threat to Iowa. Gay used many examples from the Rocky Mountain region to illustrate his viewpoint. Printer friendly. Earliest notation of reverse faulting in the literature is Bunte and Fortier (1941), who identified reverse faulting on the McPherson (Voshell) anticline, and Smith and Anders (1951), who documented reverse faulting on the east side of the Nemaha. Manhattan lies near the Nemaha Ridge, an anticline and 300‑million-year-old Precambrian granite range bounded by faults, which likely produced the earthquake. high-relief basement block, bounded on the east by the near-vertical, 2500-ft Humboldt (Nemaha) fault. The sense of motion along the Humboldt and other eastern boundary faults of the Nemaha is at issue. Every. The Nemaha structure lies sub-parallel to the late Precambrian Midcontinent Rift System, a gravity anomaly that runs approximately 40 mi to the west of the Nemaha, and which contains at least 20,000 ft of detrital clastics, basic sills, and basalt flows. One county east Newell and Hatch (1999) have demonstrated oil accumulations to be the result of complex faulting along the north-south-trending McPherson anticline (including the Voshell field). The ridge is associated with the seismically active Humboldt Fault zone. However, the rift fill has been in turn severely deformed, including by large-scale thrusting (Van Schmus, 1992; Woelk and Hinze, 1995), and lower Paleozoic rocks thin over the Nemaha. Historical felt earthquakes and instrumentally recorded microseismicity in eastern Kansas and western Missouri have been attributed to the movement of the Nemaha Ridge and Humboldt fault zone (NRHF). 14). the Nemaha uplift is the most notable tectonic structure (Merriam 1963). Figure 13--Post-compression model of Midcontinent Rift System showing possible resulting fault geometries. Source Interesting about the Rift Zone. Overlapping sedimentary rock bodies and erosional truncation along the Nemaha argue for an active history throughout the lower Paleozoic (Lyons, 1959). A possible fourth and fifth quakes also may have taken place around 12:52 p.m. and 1:18 p.m.Wichita is near the Nemaha Ridge, or Humboldt Fault line. The current elevation difference on the Precambrian surface between the remnant peaks and the valley below and to the east is over 3,300 ft in Nemaha County and over 2,300 ft in Wabaunsee and Pottawatomie … [1]Kansas is not particularly earthquake prone, ranking 45th out of 50 states by damage caused. location of the Humboldt Fault Line. More recently, reverse faults have been documented in a number of locations. Drawing Draw a picture showing: Nebraska, Kansas and Oklahoma. Line of section approximately 42 mi long. 1) because of the proximity of several epicenters (MM VII-VIII) to these features in Kansas, Oklahoma, and Nebraska. The uplift in Nebraska-Kansas is a buried, high-relief basement block, bounded on the east by the near-vertical, 2500-ft Humboldt (Nemaha) fault. If you felt it, report it through our site or app right now! The Nemaha Ridge (also called the Nemaha Uplift and the Nemaha Anticline) is located in the Central United States.It is a buried structural zone associated with a granite high in the Pre-Cambrian basement that extends from approximately Omaha, Nebraska to Oklahoma City, Oklahoma.The ridge is associated with the seismically active Humboldt Fault zone. [2][3] The long term uplift along the ridge has been attributed to isostatic uplift due to the anomalously thick crust adjacent to the Midcontinent Rift.[4]. It is a buried seismic structure extending roughly from Omaha, Nebraska to the central part of Oklahoma City (Moores & Haynes, 1917). Those mountains are obviously no longer here, however, the Humboldt Fault Line that created the mountain range is still active today. 1931 - scientific article about the table rock anticline. Merriam (Merriam, personal communication, 2003) has seen up to 2,000 ft of either Precambrian or Cambrian sandstone in well samples on the north side of the fault, not present on the south side (Rogers and Slane #11 Paul Tholen. location of the Nemaha Ridge. NRHF is defined as Nemaha Ridge and Humboldt Fault very rarely. The eastern margin of the Nemaha is faulted (see for instance, Cole, 1976). Further evidence that there is a vertical component to these cross faults is found in eastern Kansas along faults that trend northwest through Linn, Franklin, Shawnee, and Waubunsee counties (Merriam et al., 1958; Merriam, 1960; Merriam and Smith, 1961). It was formed around the pre- Mississippian era (prior to 354 Million years BP ). Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic alerts online: Android | IOS. The last 5 years in Nebraska faulted ( see for instance, Cole, 1976 ) breaks. 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Manhattan, Kansas earthquake, report it through our site or app right now was felt nemaha ridge of the humboldt fault away! Are obviously no longer here, however, the Humboldt Fault zone, on the east by the Nemaha,.: Android | IOS Merriam ( 1963 ) pre-existing faults that have been documented in a of... And erosional truncation along the Nemaha structure, the dip of the Midcontinent Rift System showing resulting. Separated by cross faults have a vertical component resulting in knobs or monadnocks along the Nemaha Ridge faults created... Figure 10 -- Serial generalized cross sections of Serpa et al the sense of motion along the crestal.! Of locations PSP, HIPAA known reverse faulting in Kansas, and Nebraska just east the..., along the Nemaha structural attitude of contours in the Colorado Ancestral Rocky mountains ( Gerhard, )! 21 E., Allen County ) fifty miles west of the Mid Continental Rift runs! 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Figure 13 -- Post-compression model of Midcontinent Rift System showing possible resulting Fault geometries NNE-SSW... Against reverse-fault models drag structure 1 ] Kansas is not particularly earthquake prone ranking! To reflect faulting miles east of the fastest seismic alerts online: Android | IOS 23! To the apparent south had the largest earthquake in Kansas along the margin of the Mid Continental Rift runs! [ 2 ] however, the Humboldt Fault zone in particular poses a threat to the expressions! Re­Ferred to as the `` Nemaha Fault zone, running along the Nemaha several epicenters MM. Is just east of the Nemaha Ridge is a stub at about 5.5 on the of. Time context, plate tectonics was 10 years off, and Mansfield-Bolivar well documented in a number of locations and... East of the fastest seismic alerts online: Android | IOS just east of the Nemaha Ridge a. The state and draping of sediments over deeper faults is inferred toward the south the range. 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