fault lines in north carolinajoe's original dartmouth menu
The most significant fault in the region is the Brevard fault zone, which extends from Alabama to Virginia across North Carolina, where it coincides with a long, linear topographic low. Please note it is a large file.Click to display; right-click and"Save Link/Target As" (Windows) to download (large PDF files do not always load correctly in some browsers) A fault is a fracture or zone of fractures between two blocks of rock. The great earthquakes of 1811–1812 (magnitude 7.3–8.3) were centered in the Mississippi Valley near New Madrid, Missouri, and were felt throughout the state.
Most were formed during the Paleozoic mountain building episodes, around 480 to 300 million years ago. Wooten, K. Snider, and T.W. To view the full report, visit Bechtel, R., M.A.
In contrast, there are no active fault zones in North Carolina.” One of the strongest quakes to rattle the region reportedly occurred in Buncombe County in 1916 with a magnitude of 5.2. North Carolina North Carolina Geologic Map (1985) The North Carolina Geological Survey published this map in 1985. Accessed from: Hatcher, R.D., Jr., B.B. Seismic Hazard Maps. With further detailed geologic mapping, more fault lines will likely be identified.These faults are not visible as breaks in the ground surface due to their antiquity, and similarly the known faults do not correspond with the locations of historic earthquake epicenters. There is also evidence that a few faults in the region may be Mesozoic or younger in age, forming when the continents pulled apart as the modern Atlantic Ocean opened.
This level of seismic activity is due to North Carolina’s presence upon a passive, not active, continental margin – unlike West Coast regions, which experience frequent earthquakes along known and active fault zones. These characteristics of fault zones influence the quantity, quality, and flow directions of groundwater, can affect the stability of rock slopes, and can make them ideal sources of flagstone.A dike is a tabular igneous intrusion that is younger than the existing rock it crosscuts. A large, much studied fault in North Carolina is the Hayesville-Fries fault. The most significant fault in the region is the Brevard fault zone, which extends from Alabama to Virginia across North Carolina, where it coincides with a long, linear topographic low. In Western North Carolina, several generations of igneous dikes are exposed at the surface today, but are too small to be displayed on the regional map. Most faults produce repeated displacements over geologic 2007. Taylor, J.C. Reid, R.M. Faults may range in length from a few millimeters to thousands of kilometers. All of the known faults exposed on the surface in North Carolina are ancient and remain inactive. Accessed from: United States Geological Survey. Most of the earthquakes here are small, random, scattered movements of the Earth's crust. Another major fault in the region is the Linville Falls fault. McBride, and J.R. Martinez Catalan, editors, 4-D Framework of Continental Crust: Geological Society of America Memoir 200, p. 595-632, doi: 10.1130/2007.1200(29).North Carolina Department of Crime Control and Public Safety, Division of Emergency Management. During this time, the Earth’s crust in the region was buckled (folded) and shifted many miles to the northwest along thrust faults. The most recent generation intruded the crust along mainly NW-SE trending fractures that formed around 150-250 million years ago, during Mesozoic rifting of North America.
Accessed from: United States Geological Survey. The major faults of Western North Carolina discovered thus far are ancient, and none are known to be active.
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