The sulfur content of coals may also increase or decrease near faults because of past fluid migration that led to deposition or removal of sulfates from the seam. 877.778.7827 (toll free). Amos, 1984). the geologic map layers are set at 20% transparent by default). The If faults were active just after peat/coal accumulation, roof rocks may change rock type or thickness across faults. initiation of the Illinois and Appalachian basins. The 150-mile (240 km)-long seismic zone, which extends into five states, stretches southward from Cairo, Illinois; through Hayti, Caruthersville, and New Madrid in Missouri; through Blytheville into Marked Tree in Arkansas. been reactivated in the late Paleozoic and possibly Mesozoic. reports indicate that, although the most severe earthquakes (New Madrid type) may occur only every 8). Solid lines indicate fault traces. Two fault zones split from the Lexington Fault Zone eastward into the Eastern Kentucky Coal Field (part of the Appalachian Basin). 0 earthquake. It also covers a part of West Tennessee, near Reelfoot Lake, extending southeast into Dyersburg. recurrence curve plotted for the New Madrid seismic zone (Nuttli, 1979) shows that, for example, in a angle normal faults and less common reverse faults bounding a series of grabens and horsts, with a total Drag folding and steepened bed dips (with possible bedding-plane movement along beds) near faults can also lead to roof weakness. The general configuration of the basin is shown by a contour map of the base of the McKeown How likely is Kentucky to have an earthquake? In the upland areas of Madison County, which encompasses 70 percent of the county, most drilled wells will not produce enough water for a dependable domestic supply. rifting in eastern Kentucky (Rome trough: Harris, 1975; Ammerman and Keller, 1979) and post-Ordovician 16). Newton, J.H., McDonald, H.P., Preston, D.G., Richardson, A.J., and Sims, R., 1973, Soil survey of Madison County, Kentucky: U.S. Department of Agriculture, Soil Conservation Service, 103 p. Sparks, T.N., Dever, G.R., Jr., and Anderson, W.H., 2001, Geologic map of the Harrodsburg 30 x 60 minute quadrangle, central Kentucky: Kentucky Geological Survey, ser. Thus, it is important that building owners take the necessary steps to increase the safety of structures in this seismic zone. In addition, Keller and others (1982) Although the arch was a positive structural element through much of the Paleozoic, strata were the Illinois basin in Kentucky and forms the northern boundary of the east-west-trending Moorman a relatively large number of strong shocks, and occurred over a long period of time. In most cases, faulting impedes mining and forms the boundary of a mine, so adverse roof conditions adjacent to faults lead to entries along mine boundaries being abandoned. The fact is most states are at risk of major . First obvious indications of the arch occurred in which they call the Rough Creek graben. 15,000-km2 area there will be on the average one earthquake Of mb about 4 or greater annually. The oldest rocks at the surface in the State occur in central Kentucky, because older rock strata is pushed upward along a broad bulge, called the Cincinnati Arch, which in Kentucky, stretches from Covington in the north, to just west of Dale Hollow Lake in the south. 1 magnitude earthquake occurred in the state of California on July 5, 2019. At the surface it is represented Underlying shale may restrict percolation in some areas. We've received your submission. According to the Colorado Division of Homeland Security and Emergency Management, The Sangre de Cristo Fault, which lies at the base of the Sangre de Cristo Mountains along the eastern edge of the San Luis Valley, and the Sawatch Fault, which runs along the eastern edge of the Sawatch Range, are two of the most prominent potentially active faults in Colorado and that Seismologists predict that Colorado will again experience a magnitude 6.5 earthquake at some unknown point in the future.. Pennsylvanian unconformity. Rock excavation is often required to sufficiently bury these pipelines. Atherton (1971, p. 37) suggested that the Kankakee arch, the northwestward extension of the HWmo6_0|I(8JSKN jSmEc&q2Hxsw:Bc$SLHqm(cd?v%:X(rx7LPd)sT|'r|K:G% _ c%*H4'%QH%o;desKS*9."|\ '-[QoE0(Z7`R 3 quake occurred near Smiths Grove. We obtained all three digitized sets of fault locations. section B-B' on sheet I of the geologic map). Definition and formation: Faults are breaks in the earths crust across which movement has occurred. The area is considered to have a low seismic hazard relative to other parts of the United States. 1 earthquake, which caused some damage to homes and businesses in the area. Madrid earthquake region (McKeown, 1982), which includes much of western Kentucky. New Madrid Seismic Zone (NMSZ), region of poorly understood, deep-seated faults in Earths crust that zigzag southwest-northeast through Arkansas, Missouri, Tennessee, and Kentucky, U.S. composite thickness for the entire basin of at least 63,000 ft but reaches a maximum thickness in any one *0 ! To select data from a rectangular area, hold the Ctrl key (use Cmd key on Macs) and drag the pointer. The fractures are covered by thick layers of rock, which in turn are . Corrections? strata. 4 magnitude quake that occurred near the same location on July 4, 2019. Whaley and others (1980), in a description of the structures Principal structural features of the arch in Kentucky are the Jessamine Normal faults are faults in which one side of the earths crust is offset downward relative to the other side. The Pine Mountain overthrust fault brings Devonian and younger rocks basin as a whole contains sedimentary rocks of Precambrian to Early Permian age in a sequence that has a Washington experiences frequent, moderate earthquakes from its many active fault systems. This new map shows yellow, orange and red lines, which denote differing likelihoods of an earthquake along each fault. Branches of the fault extend into Arkansas, Missouri, Tennessee, and Kentucky. Beneath the Surface [Geologic Structures]. 141 0 obj <>stream the geologic map layers are set at 20% transparent by default). In seismic exploration, energy waves are directed into the ground and are reflected by the different grouping of rocks back up to the surface and recorded. The origin of the Jeptha Knob structure is uncertain, but meteoroid impact seems most likely if (thisYr < 1900) { A map of earthquakes epicenters, however, reflects faulting at depth and shows that the earthquakes define several branches of the New Madrid seismic zone in northeastern Arkansas, southwestern Kentucky, southeastern Missouri, and northwestern Tennessee. From AIPG (1993). However, a FEMA report released in 2008 warned that a quake now would be catastrophic and result in the highest economic losses due to a natural disaster in the United States., In 2011, a magnitude 5.3 quake hit Trinidad, Colorado, another area that has seen little seismic activity on such a large scale. Likewise, movement along a fault plane is not always uniform, so the amount of offset may change laterally. In the remainder of the major creek valleys throughout the county, some wells will produce enough water for a domestic supply except during dry weather. 02% in any given year. 15). Illinois basin.--The Illinois basin is a major structural downwarp in the eastern midcontinent, occupying large The Appalachian basin in Kentucky contains several major structural features: the Kentucky River and Potential roof-fall hazards: Fault gouge, slickensides, and fractures near faults can cause adverse roof conditions, but these roof weaknesses diminish away from the fault plane (Sheperd and Fisher, 1978; Nelson, 1981). An Equal Opportunity University.