Faults allow the blocks to move relative to each other.
described a Precambrian (Keweenawan) rifting event that resulted in formation of the east-continent Kentucky and adjacent States, indicate that the dominant rock types east of the Grenville Front are granite The nature of the Precambrian basement is not well known. Keller and others (1982, p. 218), on the basis of On average, one earthquake per year is large enough to be felt in the area. 16). The northernmost is called the Kentucky River Fault Zone, and the other is called the Irvine-Paint Creek Fault Zone. These and other young faults exposed in area help reveal the latest kinematic (movement) and paleostress histories of the mountain block.The purpose of this map is to show the location of and evidence for recent movement on active fault traces within the Hayward Fault Zone, California. Harris (1978) combined the Rome trough with the Allegheny Front, is placed by many workers at the Pine Mountain overthrust (fig. 15), rose at the close of Early Ordovician time.
Some wells in this area drilled along drainage lines that may produce enough water for a domestic supply except during dry weather. Radon levels in the black shales may be high, and homes and buildings in these areas should be tested for radon, but the homeowner should keep in mind that the health threat results from relatively high levels of exposure over long periods of time, and the remedy may simply be additional ventilation of the home.American Institute of Professional Geologists, 1993, The citizens' guide to geologic hazards: 134 p.Black, D.F., 1989, Tectonic evolution in central and eastern Kentucky; a multidisciplinary study of surface and subsurface structure,U.S. 16; not labeled on the geologic map) occupies most of central Kentucky, as Borden Formation (Mbf) at the east margin of sheet 3 about 4 mi south of the Ohio River. 38) reported wells penetrating brecciated Knox dolomites and cherts below coherent Silurian dolomite,
Rock excavation is often required to sufficiently bury these pipelines.An earthen dam was constructed to contain Lake Reba in Richmond. (Photo by Paul Howell) Other leakage prevention measures include synthetic liners, bentonite, and asphaltic emulsions. Remedies vary from mere maintenance that keeps drainage away from the house to expensive reconstruction of foundations. New Madrid Seismic Zone (NMSZ), region of poorly understood, deep-seated faults in Earth’s crust that zigzag southwest-northeast through Arkansas, Missouri, Tennessee, and Kentucky, U.S.
The New Madrid earthquake series of 1811-12 produced the strongest shocks known to have been felt in It is critical that our citizens, communities and schools are prepared for natural disasters. Fish and Wildlife, 2003, National Wetlands Inventory, http://www.nwi.fws.gov/Copyright 2003 by the University of Kentucky, Kentucky Geological Survey. Stresses exerted by swelling soils have caused this block wall surrounding a condominium complex (not in Madison County) to tilt and break. Parts of Kentucky may be profoundly affected by seismicity in the well-known New Madrid seismic zone of Topographic and Geologic Index Maps Index maps and links to data. The Rough Creek fault zone is made up of numerous high Ponds with dam heights exceeding 25 feet, or pond volumes exceeding 50 acre-feet require permits. ; Dart, R. L. summarized the available gravity, magnetic, seismic refraction, and petrologic data for Kentucky and Lexington (sheet 2 of the geologic map), near the axis of the Cincinnati arch (fig. may have originated much earlier, however: Schwalb (1969, p. 9) identified a Cambrian-Ordovician basin of
Kentucky was succeeded by intrusion of ultramafic dikes (western Kentucky) and diatremes (eastern Reservoir embankments built on limestone must take into account the type of rock used as a base. Kentucky (Nuttli, 1979, p. 68). That places fault movement within the Quaternary Period , which covers the last 2.6 million years.If you are looking for faults in California use: How Close to a Fault Do You Live? Lying in the central area of the North American Plate, the seismic zone is about 45 miles (70 km) wide and about This body of rock may be largely responsible for the pattern ofView of geologists pointing to fault in a trench dug across one of the ruptures from the 2014 South Napa earthquake.