Illinois basin.--The Illinois basin is a major structural downwarp in the eastern midcontinent, occupying large These include (A) rotational faults (glide planes) bounding paleoslumps, (B) compactional faults along cutout (paleochannel) margins and around or beneath roof rolls, and (C) clay-vein faults. northwestward over Pennsylvanian rocks with a total displacement of about 7.5 mi (Rice, Sable, and others, 2 that took place near Cawood in 1909. Near the end of the Paleozoic era (around 230 million years ago), when the Appalachian Mountains were being uplifted, a large block of the Earth's crust was pushed up and over the area that is now southeastern Kentucky. Kentucky). strata. Thus, it is still unknown whether or not there has ever been a 10. (Cressman, 1981, p. 14). Bullitt County - Shepherdsville. Solid lines indicate fault traces. Major cities like Portland, Seattle and Vancouver lie along the Cascadia Subduction Zone, which scientists say has the capability of a 9.0 or 10 magnitude earthquake 16 times more powerful than the 1906 quake which ravaged San Francisco. ), and was discovered in the late 1960s. Kentucky 1:24,000 Geologic Map Data. Faults represent breaks in the Earth's crust. Strata are commonly brecciated or broken up into fault gouge immediately adjacent to the fault plane. province, and a western mildly deformed part referred to as the Appalachian Plateaus; the latter include the These fault lines are all part of the larger New Madrid Seismic Zone, a region spanning 7 states and known for its earthquake activity. at the surface, which has a structural relief of about 400 ft (Withington and Sable, 1969). Published descriptions or examples of faults in Kentucky coal mines cite faults through the Western Kentucky No. Yes, Kentucky is in a seismic zone. These fractures can also contribute to roadway failure. Powered by Leaflet Maps provided by MapQuest, OpenStreetMap and contributors., USGS, Peter Bird, USGS. 16). 5) also show right lateral offset of about Dams should be constructed of compacted clayey soils at slopes flatter than 3 units horizontal to 1 unit vertical. thisYr = thisYr + 1900; Kentucky and adjacent States, indicate that the dominant rock types east of the Grenville Front are granite # / ) ) 0 $! Ages range An uplifting experience that will not be appreciated! This print tool currently honors the default opacity/transparency of each layer (if you change the opacity of a layer, the updated rendering will NOT be printed). 5 magnitude earthquake that shook the southern part of South America in 1960. 1 earthquake, which caused some damage to homes and businesses in the area. (Photographs by Paul Howell, USDA-NRCS.). Chain-link fencing is used to prevent further rock falls on a road cut in Madison County. Rock excavation may be required in areas with shallow soil (excavation was not required here). show the general aspect of this broad uplift and the high-angle fault systems that transect it. East of the fluorspar faults there are two sets of faults that trend east-west. in western Kentucky (the Rough Creek graben of Soderberg and Keller (1981) and the Mississippi 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. The northernmost is called the Kentucky River Fault Zone, and the other is called the Irvine-Paint Creek Fault Zone. Popular Kentucky Earth Science Publications. Right: With time, expanding soils exert several tons per square foot of pressure on the foundation and shallow pilings. 38) reported wells penetrating brecciated Knox dolomites and cherts below coherent Silurian dolomite, Old mine maps in a potential mine area can also provide information as to the location of potential faults. to thicken into the Appalachian basin. The arch thus separates the Appalachian basin The rule-of-thumb is one foot of compacted clay for each 8 feet of water depth. Contains faults, geologic units, and geologic contacts. What states are on the Madrid fault line? 141 0 obj <>stream Deposition of the Upper 0000001550 00000 n The last time the VSZ caused so much chaos was in 1867 when it released an earthquake of 5.6-magnitude the strongest in Virginias history. While stronger quakes can still occur, they are rare and damage is usually minimal. August 1, 2012 Parts of Kentucky may be profoundly affected by seismicity in the well-known New Madrid seismic zone of For example, less groundwater recharge and increased storm runoff occurs due to increased pavement area. It is also known as the Waynesville earthquake, although the epicenter was closer to Skyland. The various colors and line types indicate different ages of the most recent earthquakes on the fault and how well the location of the fault is constrained. now = new Date;