Bream, and A.J. Other damage included cracked house foundations, dislodged foundations, broken water pipes, and fallen glassware from shelves. migration of Potomac River waterfall from geologic boundary at I-66 bridge upstream to Great Falls (blue), and on to Seneca Creek (red) in next million or so years Virginia rivers flow eastward from the Blue Ridg and across the Piedmont to the Fall Line, then on to the Chesapeake Bay or to Albemarle/Pamlico Sound in North Carolina. With the use of USGS quad maps, we offer topos of every important region in the state. According the theory of plate tectonics, Earth's outer shell is made up of a series of plates.The map above shows names and generalized locations of Earth's major tectonic plates. The North American Plate is one of the 15 or so major "chunks" of crust that float on top of the hot mantle. Every map in the state of Virginia is printable in full color topos. On December 9, 2003, a 4.5 magnitude earthquake near Richmond, Virginia, was felt as far south as Raleigh. the Fall Line extends from New York to Georgia Source: US Geological Survey Open File Report 99-11, Color Shaded Relief Map of the Conterminous United States, Late Mississippian (325 million years ago), Hydrogeologic Framework Of The Virginia Coastal Plain, Professional Paper 1404-C: Hydrogeologic Framework of the Virginia Coastal Plain, Fredericksburg 7.5x7.5 topographic quadrangle, The River and the Rocks: The Geologic Story of Great Falls and the Potomac River Gorge, Washington West 7.5x7.5 topographic quadrangle, Geologic map of the Washington West quadrangle, District of Columbia, Montgomery and Prince George's Counties, Maryland, and Arlington and Fairfax Counties, Virginia, How the Fall Line Shaped Powhatan's Area of Control, How the Fall Line Shaped Colonial Settlement in Virginia, Frdericksburg 7.5x7.5 topographic quadrangle, Petersburg 7.5x7.5 topographic quadrangle, Geologic Map of the Potomac River Gorge: Great Falls Park, Virginia, and part of the C&O Canal National Historical Park, Maryland, State Profile and Energy Estimates - Virginia, https://jamesriverpark.org/science-in-the-park/geology/SouthGeoTour.pdf, https://archive.org/details/baronspotomacka00conwgoog, http://www.nps.gov/history/history/online_books/grfa/, http://www.dgif.virginia.gov/fishing/regulations/game.asp, Design, Revisions, and Considerations for Continued Use of a Ground-Water-Flow Model of the Coastal Plain Aquifer System in Virginia, Open File Report 99-11, Color Shaded Relief Map of the Conterminous United States, Rocks and Ridges - The Geology of Virginia. In 2011, a magnitude 5.3 quake hit Trinidad, Colorado, another … It also includes map plates showing faults compiled in the three seismically active areas of Virginia and a map of historic and modern earthquake epicenters. Source: EPA Chesapeake Bay Program, Bay Atlas Interactive Map Viewer and US Geological Survey (USGS), A Tapestry of Time and Terrain. 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. Wilkes County Earthquake – August 31, 1861. The epicenter feature class includes earthquake locations throughout Virginia between 1774-2017. “Tectonic map of the southern and central Appalachians: A tale of three orogens and a complete Wilson cycle.” In R.D. It had a magnitude of 5.6 Mfa (a seismic scale that is based on an isoseismal map or the event's felt area) and had severe effects in Narrows, where ground motion was observed and the flow of streams was disrupted. Medina, J.G. The plate includes both continental crust and heavier (iron- and magnesium-rich) oceanic crust. The USGS National Seismic Hazard Mapping Project develops these maps by incorporating information on known and potential earthquakes and the associated ground shaking obtained in science and engineering research and workshops, review by science organizations and state geological surveys, and advice from expert panels. the Fall Line zone (black line) separates the Coastal Plain of eastern Virginia (yellow) from the hard bedrock of the Piedmont The map above is a Landsat satellite image of Virginia with County boundaries superimposed. This causes several major differences in … Fault and structural zone data was compiled only for the seismically active areas of Virginia. Using very simplistic math, the remaining lifespan of Great Falls is about 1-1.5 million years. That physical pattern of rapids/waterfalls blocked ships from sailing further upstream, limiting water-based transportation of the European colonists. In Western North Carolina, the shaking produced effects such as broken windows, damage to masonry (especially weak masonry), ringing bells, and furniture being moved or broken. The epicenter of this earthquake was near Wilkesboro, where intense shaking caused bricks to fall from chimneys.

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