syncline (fig. <]/Prev 1512027>> We've received your submission. For example, in 1980 New Madrid experienced a magnitude 5. Located in far Western Kentucky is one of our most popular outdoor areas: Land Between The Lakes (LBL). The following brief descriptions of the four structural provinces include discussions of their regional setting, The USDA-NRCS can provide guidance on the application of these liners to new construction, and for treatment of existing leaking ponds. First obvious indications of the arch occurred in 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. The Pine Mountain overthrust fault brings Devonian and younger rocks The potential for significant shaking and ground movement can cause considerable damage to structures in the region. The current form of the embayment in Kentucky was established in latest The origin of the Jeptha Knob structure is uncertain, but meteoroid impact seems most likely 1 magnitude earthquake occurred in the state of California on July 5, 2019. Lying in the central area of the North American Plate, the seismic zone is about 45 miles (70 km) wide and about 125 miles (200 km) long. The KyGeoNet is the Geospatial Data Clearinghouse for the Commonwealth of Kentucky. In some cases, where offset is not too great, mine plans can be altered to ramp (adjust the dip of the excavated entries up or down) across the fault to the level of the coal on the other side of the fault. GIS KT map from ArcGIS site: "1:24,000 Geologic Map Data for Kentucky in GeoSCiML. the Moorman syncline of western Kentucky as the "Eastern Interior Aulacogen" and traced the trough from 2 that took place near Cawood in 1909. That is because the strata on the left side of the photo have moved downward relative to the strata on the right side of the photo. Omissions? While stronger quakes can still occur, they are rare and damage is usually minimal. Output is the same text file with the converted values and the KY county and KY 1:24,000 quadrangle where a coordinate is located. An Equal Opportunity University. document.write(thisYr); When strata moves along a fault an earthquake occurs. However, there is evidence that Kentucky may be experiencing a spike in seismic activity since 2009, with more frequent tremors occurring throughout the state. stratigraphy or sedimentation of the Ordovician rocks that can be related to the arch (Cressman, 1973, p. 8; Silurian deformational event argues against an impact origin. It also covers a part of West Tennessee, near Reelfoot Lake, extending southeast into Dyersburg. The vertical component has been stretched or vertically exaggerated in the above diagram. There are some minor faults in eastern and western Kentucky, but they are not thought to be active. A detail of the western part of the block diagram, presented as a cross section (2-dimensional panel illustration) how the Tertiary and Cretaceous strata cut across the older Paleozoic strata, and dip into the Paducah-Memphis Basin. " $ #& In the photo above, one can see that rocks on one side of the break in strata are different than rocks on the other side. most movement on faults at the southern end of the Illinois basin took place at the end of the Paleozoic. 133 9 Harris (1970) has shown the fault to be a ramp on a bedding plane Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. These fault lines are all part of the larger New Madrid Seismic Zone, a region spanning 7 states and known for its earthquake activity. Roof support: Slickensides and fractures near faults can cause adverse roof conditions, and roofs may require supplemental support, as discussed for fractures. geologic map; evidence of these features has been reported from Mississippian and older rocks in The cross section shows numerous faults cutting across and offsetting the strata beneath the surface of Kentucky. suggesting a "crypto-volcanic" nature. xref 0000001642 00000 n This area, mostly on sheet 3 of the geologic map, forms a part province, and a western mildly deformed part referred to as the Appalachian Plateaus; the latter include the Popular Kentucky Earth Science Publications. 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. It has produced magnitude 8 to 8. (1983, p. 24). Carlisle County - Bardwell. Stresses exerted by swelling soils have caused this block wall surrounding a condominium complex (not in Madison County) to tilt and break. On Dec. 16, 1811, a magnitude 7.7 earthquake hit the New Madrid fault line, which lies on the border region of Illinois, Indiana, Missouri, Arkansas, Kentucky, Tennessee and Mississippi. Movement may not occur along a fault for hundreds or thousands of years, and then the fault may move an inch to several feet all at once. inclusion of the Cumberland thrust sheet of southeasternmost Kentucky in the fold-and-thrust province. 0000001185 00000 n If faults were active just after peat/coal accumulation, roof rocks may change rock type or thickness across faults. thisYr = thisYr + 1900; Fault gouge formed from movement along the fault. No, Pine Mountain in Kentucky is not a fault line. Topographical changes resulting from the earthquakes included fissures, landslides, subsidence (sinking) and upheavals, soil liquefaction, the creation and destruction of lakes and swamps, and the wasting of forests. A recent seismic study of the crustal The Moorman syncline extends into southern Illinois, where it is known as the Eagle endstream endobj 134 0 obj <>]/PageLabels 122 0 R/Pages 125 0 R/Type/Catalog>> endobj 135 0 obj <>/Font<>>>/Fields[]>> endobj 136 0 obj <>/ProcSet[/PDF/Text/ImageB]/XObject<>>>/Rotate 0/Type/Page>> endobj 137 0 obj <> endobj 138 0 obj <>stream hb```">&S ac`a8 _o9j{VkL*1{|icPGEO&u\w:=q$O\S-9 T ` ` @@ vfb3"|$2f b v` rY lY`a609060 `@X vH;3b :k0\U\(C&0@u0 FV\s mi. Reservoir embankments built on limestone must take into account the type of rock used as a base. Some seismologists believe that the maximum magnitude for a quake is 9. Whaley and others (1980), in a description of the structures Breckinridge County - Hardinsburg. For example, recent studies have suggested that deep-injection wells and hydraulic fracturing may cause minor earthquakes. Natural gas piplines (30-inch mains) are laid across a new subdivision in Kingston, Madison County. Mitchell County Earthquake - July 8, 1926. Cross sections and block diagrams (like the one above) can be used to illustrate why the units of geologic strata on the geologic map and corresponding land-surface features on the physiographic map occur where they do in the State. Updates? Fault planes are not always vertical, so the position of the fault may change with depth depending on the dip of the fault plane. basin as a whole contains sedimentary rocks of Precambrian to Early Permian age in a sequence that has a 19 earthquakes in the past 30 days. indicating growth faulting with a total throw at the top of the Precambrian of 5,000 ft along the northern mapping has revealed numerous minor normal faults and grabens, many en echelon in northwest-trending (Photographs by Paul Howell, USDA-NRCS. Carter County - Grayson. Left: All is well in this newly built home until water from percolation, drains, lawn sprinklers, leaking sewers, or water mains soaks swelling soil beneath the foundation. An expression (above) of the Kentucky River Fault occurring in limestone north of Clays Ferry bridge on I-75, which continues under the bridge itself (below). Madrid earthquake region (McKeown, 1982), which includes much of western Kentucky. Data set is derived from the 7.5-minute geologic quadrangle maps (scale 1:24,000); then attributed, edgematched, and compiled for statewide coverage. Seismic risk associated with these faults is very low. This is called a fault. major structural features, and tectonic history, including age of deformation where known.