2011 Virginia earthquake

2011 Virginia earthquake
Shake map showing the epicenter of the earthquake in Virginia
Date August 23, 2011[1]
Origin time 1:51:04 EDT
Magnitude 5.8 Mw[1]
Depth 6 km (4 mi)[1]
Epicenter 37°56′10″N 77°55′59″W / 37.936°N 77.933°W / 37.936; -77.933Coordinates: 37°56′10″N 77°55′59″W / 37.936°N 77.933°W / 37.936; -77.933
Type Oblique-slip
Areas affected Canada, United States
Max. intensity VII (Very strong)[2]
Peak acceleration 0.26g[3]

The 2011 Virginia earthquake occurred on August 23 at 1:51:04 p.m. local time in the Piedmont region of the US state of Virginia. The epicenter, in Louisa County, was 61 km (38 mi) northwest of Richmond and 8 km (5 mi) south-southwest of the town of Mineral. It was an intraplate earthquake with a magnitude of 5.8 and a maximum perceived intensity of VII (Very strong) on the Mercalli intensity scale. Several aftershocks, ranging up to 4.5 Mw in magnitude, occurred after the main tremor.

The earthquake, along with a magnitude–5.8 quake on the New York–Ontario border in 1944, is the largest to have occurred in the U.S. east of the Rocky Mountains since an earthquake centered in Giles County in western Virginia occurred during 1897,[4] with an estimated magnitude of 5.8.[5]

The quake was felt across more than a dozen U.S. states and in several Canadian provinces, and was felt by more people than any other quake in U.S. history.[6] No deaths and only minor injuries were reported. Minor and moderate damage to buildings was widespread and was estimated by one risk-modeling company at $200 million to $300 million, of which about $100 million was insured.[7][8]

The earthquake prompted research that revealed that the farthest landslide from the epicenter was 150 miles (240 km), by far the greatest landslide distance recorded from any other earthquake of similar magnitude. Previous studies of worldwide earthquakes indicated that landslides occurred no farther than 36 miles (58 km) from the epicenter of a magnitude 5.8 earthquake. The Virginia earthquake study suggested that the added information about East Coast earthquakes may prompt a revision of equations that predict ground shaking.

Geology

Cross-sectional illustration of normal and reverse dip-slip faults.
Generalized geologic map of the central Virginia Piedmont with faults and earthquakes (M>2, 1973–2011).

The earthquake occurred in the Virginia Seismic Zone, located in the Piedmont region.[9] The Virginia Piedmont area was formed originally as part of a zone of repeated continental collision that created the ancestral Appalachian Mountains, a process that started during the Ordovician period with the Taconic orogeny and finished during the Carboniferous Period with the Alleghenian orogeny. The reverse faults formed during the various orogenies were partly reactivated as normal faults in extension during the Mesozoic Era as the supercontinent Pangaea broke apart. During the Cenozoic Era, compression from the opening and spreading of the Atlantic has caused some of these structures to be reactivated in a reverse sense.[10]

The earthquake's epicenter and most of the aftershocks lie between the surface traces of two structures, the Spotsylvania Fault, a southeast dipping zone of high ductile strain, and the Chopawamsic Fault, a thrust fault.[11] The earthquake's focal mechanism shows reverse slip faulting on a north to northeast striking fault plane. The spatial distribution of aftershocks show that the causative fault dips to the southeast at 50–55°. There was no surface faulting associated with the earthquake.[12] The size of the rupture is as yet uncalculated, but similar quakes have been caused by slippage along fault segments that are 5 to 15 km (3 to 9 mi) long.[1]

After the earthquake, several websites speculated about whether hydraulic fracturing (fracking) for natural gas production could have caused or contributed to the quake.[13][14] There were not any fracking operations in Virginia at the time of the quake. The nearest fracking was occurring in the Marcellus shale in West Virginia.[13][15]

Aftershocks

Numerous aftershocks occurred after the main tremor. The first four (of magnitude 2.8, 2.2, 4.2 and 3.4) occurred within 12 hours of the main shock. A 2.5-magnitude shock occurred just after midnight on August 25, followed at 05:07 UTC by the strongest, a magnitude 4.5 aftershock that woke many residents in Northern Virginia and Washington, D.C., and was felt as far away as New England, Georgia, and Illinois.[16][17][18][19]

Research

Scientists have known that the difference between seismic shaking in the East versus the West is due in part to the geologic structure and rock properties that allow seismic waves in the East to travel farther without weakening, but during November 2012, the USGS announced that recent research showed that earthquake shaking in the eastern United States can travel much farther and cause damage over larger areas than previously thought. USGS scientists found that the Virginia earthquake caused landslides at distances four times farther— and over an area 20 times larger— than previous research had shown. USGS Director Marcia McNutt said, "Scientists are confirming with empirical data what more than 50 million people in the eastern U.S. experienced firsthand: this was one powerful earthquake. Calibrating the distance over which landslides occur may also help us reach back into the geologic record to look for evidence of past major earthquakes from the Virginia seismic zone."

The USGS found that the farthest landslide from the 2011 Virginia earthquake was 150 miles (240 km) from the epicenter. This is by far the greatest landslide distance recorded from any other earthquake of similar magnitude. Previous studies of worldwide earthquakes indicated that landslides occurred no farther than 36 miles (58 km) from the epicenter of a magnitude 5.8 earthquake. The study suggested that the added information about East Coast earthquakes may prompt a revision of equations that predict ground shaking. "What makes this new study so unique is that it provides direct observational evidence from the largest earthquake to occur in more than 100 years in the eastern U.S. Now that we know more about the power of East Coast earthquakes, equations that predict ground shaking might need to be revised."

In addition to the great landslide distances recorded, the landslides from the 2011 Virginia earthquake occurred in an area 20 times larger than expected from studies of worldwide earthquakes. Scientists plotted the landslide locations that were farthest out and then calculated the area enclosed by those landslides. The observed landslides from the Virginia earthquake enclose an area of about 33,400 km2, while previous studies indicated an expected area of about 1,500 km2 from an earthquake of similar magnitude.[20]

Effect

It is estimated that approximately one-third of the U.S. population could have felt the earthquake, more than any earthquake in U.S. history. People in certain areas of Pennsylvania, however, did not feel the earthquake at all despite being relatively close to the epicenter. About 148,000 people reported their ground-shaking experiences caused by the earthquake on the USGS "Did You Feel It?" website. Tremors from the Virginia earthquake were felt as far south as Atlanta, Georgia;[21] as far north as Quebec City, Quebec;[22] as far west as Illinois[23] and as far east as Fredericton, New Brunswick,[24] with damage reported as far away as Brooklyn, New York.[25]

Although earthquakes in the central and eastern U.S. are tens of times less frequent than in the western U.S., they are typically felt over a much broader region. East of the Rocky Mountains, an earthquake can be felt over an area as much as ten times larger than a similar magnitude earthquake on the west coast. Western rock is relatively young, therefore it absorbs much of the shaking caused by earthquakes. Thus, western earthquakes result in intense shaking close to the epicenter, but fade more quickly the farther the earthquakes travel. In the eastern United States the rock is much older, and the earthquake energy can therefore spread farther and have a greater impact. A magnitude 5.5 eastern U.S. earthquake can usually be felt as far as 300 mi (483 km) from where it occurred, and sometimes causes damage as far away as 25 mi (40 km). The relatively shallow depth of this earthquake also contributed to its widespread effects.[26][27]

United States

Soon after the earthquake, the U.S. Federal Aviation Administration ordered a ground stop along the East Coast, causing some flight delays. The Air Traffic Control tower at John F. Kennedy International Airport was evacuated.[28] Flights were delayed at several airports, including John F. Kennedy International Airport, Newark Liberty International Airport, Ronald Reagan Washington National Airport, Dulles International Airport, and Philadelphia International Airport.[29] At Ronald Reagan National Airport, ceiling tiles fell in one terminal, and flights were halted.[30][31][32]

A huge increase of cell-phone calls immediately after the event congested the AT&T, Verizon Wireless, Sprint Nextel, T-Mobile USA, and Frontier Communications networks in the Mid-Atlantic region, causing disruptions and loss of service for as much as an hour after the earthquake.[33][34]

Virginia

The epicenter of the earthquake was in Louisa County, Virginia, where damage was greatest and several minor injuries occurred. The town of Mineral, located 5 mi (8 km) north-northeast from the earthquake's epicenter, reported the collapse of two buildings, as well as minor damage to several other structures, including the collapse of the ceiling in its Town Hall. Only minor injuries were reported, including the hospitalization of several people reporting chest pains related to the stress of the experience.[35] Fallen chimneys and other structural damage to buildings was also reported in Louisa, the county seat. The Gilboa Christian Church, in Cuckoo, was heavily damaged and rendered unusable.[36] At Louisa County High School, cinderblocks fell in classrooms, and cracks were seen in walls. Six students had minor injuries. Louisa County schools were closed on August 24 while engineers assessed damage to school buildings.[37] The high school and Thomas Jefferson Elementary were closed for the remainder of the school year.[38] Inspections revealed that 65 homes sustained major or severe damage and 125 homes experienced mild to moderate damage.[39] Damage in Louisa County was estimated at $80.6 million, of which $63.8 million was from damage to public school buildings and $14.7 million was from damage to residences.[40][41] On August 25, county officials declared a state of local emergency in order to allow them to request state aid.[39]

Multiple reactor sensors at the North Anna Nuclear Generating Station, located 10 mi (16 km) northeast of the epicenter, detected a slight power reduction as a result of vibrations in the reactor or monitoring devices. This caused the two nuclear reactors to shut down automatically seconds before off-site power was lost.[41][42][43] The Nuclear Regulatory Commission sent additional inspectors to the Virginia plant after preliminary measurements suggested that the ground shook more than the two reactors were designed to handle. The damage was minimal and the NRC advised that further inspections should not be interpreted to mean that the plant was not safe.[44][45] After a $21 million inspection, engineers stated that they only found cosmetic damage.[46] On November 11, 2011, the NRC gave its approval for restarting the reactors.[47]

In Charlottesville, about 27 mi (43 km) west of the epicenter, a gas leak closed several streets, including West Main Street.[48]

Some employees evacuated the Pentagon moments after the earthquake.

In Spotsylvania County, the August 24 opening of public schools was delayed while damage to buildings was assessed.[49] Six patients were treated at the Spotsylvania Regional Medical Center for minor injuries resulting from the earthquake.[37]

Several buildings in Culpeper, about 37 mi (60 km) north of the epicenter, sustained structural damage. The brick façade of the Levy Building, built during 1848, collapsed and the building was condemned and demolished.[39][50][51] The walls of St. Stephen's Episcopal Church, constructed during 1821, buckled and were deemed unstable by town officials. Another church, Culpeper Baptist Church, built during 1894, lost its chimney. Schools in Culpeper County delayed their scheduled August 24 opening to assess damage to buildings.[49] Two minor earthquake injuries were reported by the Culpeper Regional Hospital.[50] Damage in Culpeper was estimated at $10 million.[41]

In Fredericksburg, about 37 mi (60 km) northeast of the epicenter, the Dickinson Building on the campus of Germanna Community College was deemed unusable for the rest of the semester, and the whole college was closed until alternative classrooms could be found, re-opening on September 6.[52] Also in Fredericksburg, a gas leak led to the evacuation of homes and businesses in a two-block radius.[37] Officials estimated the damage total at around $711,000.[41]

In Arlington County, a burst pipe flooded two corridors at the Pentagon. Employees, many of whom left the building when the earthquake was felt, were alerted to the flooding by an alarm system that was installed after the September 11 attacks.[53] Arlington County's Thomas Jefferson Theater—home to a middle school auditorium, a church, and several community theatre groups—closed for several months due to damage to its fly rack and proscenium.[54] Nearby Alexandria also reported structural damages, though not any injuries.[55]

In Prince William County, approximately 59 miles (95 km) north of the epicenter, damage to the dam for Lake Jackson was documented by officials in May 2012 though local residents had noticed lower water levels in the lake in 2011.[56][57] Most of the water in the lake was released to relieve pressure. The dam will be rehabilitated at a cost of approximately $900,000.[57][58]

Washington, D.C.

Security video in the Washington Monument during the earthquake. The earthquake occurs at the 1:44 mark.
Repair work at the central tower of the Washington National Cathedral due to damage caused by the earthquake
Damage to the Embassy of Ecuador

The White House,[59] the Capitol, and various other buildings were evacuated. The afternoon traffic rush hour was affected, with some traffic lights inoperative,[60] and the Washington Metro system's trains operated at reduced speeds while tracks and tunnels were inspected.[61]

A National Park Service spokesperson reported that surveys revealed cracks near the top of the Washington Monument, the world's tallest stone structure, which was closed indefinitely.[60][62] The earthquake damaged three of the four pinnacles (corner spires) on the central tower of the Washington National Cathedral, cracked some of its flying buttresses, and caused additional damage.[63][64][65] As the cathedral's insurance policy did not cover earthquake damage, cathedral officials stated that they would need to raise millions of dollars to fully evaluate the damage and to stabilize and repair its limestone exterior.[65] The Smithsonian Castle incurred damage to five decorative turrets, and fifty jars of preserved specimens fell from shelves at the Smithsonian's National Museum of Natural History.[66] The Embassy of Ecuador suffered structural damage, including three collapsed chimneys and cracked internal walls.[67] The Treasury Building suffered minor damage to exterior railings, some of which fell to the ground and caused closure of a sidewalk.[68] Fire department officials in Washington reported numerous minor injuries as a result of the earthquake.[69]

Other parts of the Mid-Atlantic region

In Wilmington, Delaware, blocks fell to the street from the steeple of St. Thomas the Apostle Church, and the New Castle County Courthouse was evacuated, as was the air traffic control tower of the New Castle County Airport in nearby Wilmington Manor. Fire marshals and building inspectors were called to assess structures throughout Dover, the capital city, where the city hall was evacuated. Numerous buildings in Georgetown, the Sussex County seat, were evacuated while crews checked for damage; the Emergency Operations Center there reported 200 calls to 9-1-1. Delaware Department of Transportation crews were dispatched statewide to inspect interstate highways, the under-construction replacement Indian River Inlet Bridge, the Delaware Memorial Bridge on I-295, and other bridges and roads.[70]

In Temple Hills, Maryland, residents were evacuated from two damaged apartment buildings.[71] In Kensington, the tops of four spires on the Washington D.C. Temple of The Church of Jesus Christ of Latter-day Saints fell to the ground along with several pieces of marble from the façade.[72] Near Brunswick, the earthquake caused "significant discoloration and a reduction in the quality of the water" of a spring, leading officials to warn against using the water until further notice.[73] In the Fells Point neighborhood of Baltimore, St. Patrick Catholic Church was deemed unsafe and was scheduled to be closed for weeks for repairs.[74] In Salisbury, the City Police station endured damage above doorways and in concrete block walls,[75] and there was also minor cracking in classroom walls at Salisbury University.[76] In Annapolis, several buildings at the United States Naval Academy were damaged.[77] In Suitland, eight jars of preserved fish specimens fell from shelves at a Smithsonian Institution storage facility.[66] The 1740 Mt. Calvert Mansion, a historic site and museum located on the Patuxent River in Upper Marlboro, received substantial structural damage and was closed indefinitely to the public.[78]

In Martinsburg, West Virginia, several government buildings were evacuated, and multiple citizens reported feeling their homes shaking violently enough to rattle picture frames off the walls.[79] In Charleston, the Kanawha County Courthouse, the West Virginia State Capitol campus, and several other downtown buildings were evacuated; Kanawha County dispatchers received more than 350 telephone calls in 45 minutes, but there were not any reports of damage to buildings and infrastructure other than minor plaster cracking in the old courthouse. In Philippi, part of a chimney collapsed at the Barbour County courthouse. The West Virginia Office of Miners' Health, Safety and Training stated that West Virginia coal mines were safe following the tremors.[80][81] A roof collapse in Patriot Coal Company's Big Mountain Complex forced the closure of the mine.[82]

Trembling was felt in buildings in Philadelphia, Pittsburgh, Altoona, Hollidaysburg, York, State College, Erie, Allentown, Reading, Harrisburg and elsewhere in Pennsylvania.[83] Just before 2:00 p.m., in the midst of an opening game between New England and Europe in the Little League Baseball World Series, many people in South Williamsport experienced a ground shaking LLBWS first. Staffers at the Altoona Mirror evacuated their building after it shook for about 10 seconds from the tremor. They returned about 2:25 p.m. The third floor of the Blair County Courthouse in Hollidaysburg was evacuated but court sessions continued on the second floor. A house reportedly was moved off its foundation and its roof buckled in the Three Springs area, Huntingdon County Emergency Management Director Adam Miller said. A minor rockslide occurred on Route 453 near The Grier School in Birmingham.[83] In Center City Philadelphia, a window shattered on a lower floor at the Independence Blue Cross building, and the company sent its 3,000 employees home for the day.[84] Other office buildings in Center City Philadelphia were also evacuated soon after the earthquake.[85] Workers at the PPL Corporation in Allentown evacuated the building.[84] However, the Three Mile Island nuclear plant south of Harrisburg continued to operate during the earthquake.[84] The Bucks County Courthouse in Doylestown was evacuated after the earthquake.[86] In Philadelphia, SEPTA Regional Rail trains were restricted to a speed of 25 mph (40 km/h) while tracks were inspected for damage, and PATCO Speedline trains were briefly suspended, with no damage reported. The Pennsylvania Department of Transportation inspected bridges across the state for damage. The Delaware River Port Authority reported no damage to its four bridges across the Delaware River.[87] Minor damage was also reported in the Pittsburgh area.[88]

Damage in New Jersey was minor. The state Emergency Management office reported two gas leaks in Gloucester County.[89][90] In Burlington, Temple B'nai Israel's synagogue building, built during 1801, sustained some water damage when tremor-caused openings in the roof allowed standing water to leak in, and about 20 bricks fell, damaging a congregant's car.[90] In Camden, a vacant house partially collapsed, and government buildings were evacuated, with city workers given the option of returning home for the day.[90] Due to damage done by the quake, the municipal government of Woodbury reported that the historic Colonel George Gill Green Opera House, which was built during 1880, would be razed.[91] No other infrastructure damage was reported in the state.[90]

People gather outside 40 Wall Street in New York City after the earthquake.

Tremors were felt to varying degrees throughout New York State, including by people in some buildings in Manhattan. Physical damage occurred in Brooklyn, where a chimney in Red Hook was toppled.[25] There were some disruptions, including building evacuations and delays at airports.[92] Amtrak train service at Penn Station was also delayed.[92]

New England

The earthquake was felt throughout much of the six New England states.[93] In New Haven, Connecticut, play at the 2011 New Haven Open at Yale tennis tournament was stopped for two hours and the main stadium was evacuated while the fire department checked it for damage. No damage or injuries were reported.[94] In Boston, Massachusetts, the Massachusetts Emergency Management Agency reported tremors and swaying buildings but no damage. The U.S. District Court in South Boston was evacuated and the University of Massachusetts Boston closed early.[95] In Maine, the earthquake was felt as far north as Augusta and Portland, but no damage was reported in the state.[96]

Midwestern states

In Columbus, Ohio the Huntington Center was briefly evacuated,[97] and occupants on the upper floors of the Rhodes State Office Tower and the Vern Riffe State Office Tower reported feeling strong shaking. Evacuations also occurred in Canton[98] and Akron.[99] In Cleveland, the press box at Progressive Field shook during the third inning of a Cleveland Indians baseball game.[100]

Tremors from the earthquake were felt as far north as Saginaw, Michigan,[101] and as far west as communities on Lake Michigan.[102] There were no reports of damage.[101] USGS also listed reports of tremors from as far west as Illinois, Indiana, Wisconsin, and Minnesota.[93]

Southern states

The earthquake was felt in several southern states as far from the epicenter as Alabama, Georgia, and Florida, but no damage was reported.[93]

Canada

Tremors from the earthquake were also felt in eastern Canada, mostly in Southern Ontario, as well as in parts of southern Quebec and the Maritime provinces. In Ontario, a few buildings in Toronto were evacuated, and roads were closed as a precautionary measure in case of building collapse in Sudbury[93][103][104][105] and Windsor.[106] The year 2011 is the second consecutive year in which an earthquake was widely felt in Southern Ontario and Quebec, the previous being the June 2010 Central Canada earthquake that also affected that region.

Internet activity and social media

The USGS "Did you feel it?" citizen-based earthquake intensity website received about 60,000 reports in the first two hours after the quake, and over 100,000 responses within four hours.[107]

According to Facebook, the word "earthquake" appeared in the status updates of 3 million users within four minutes of the quake. Twitter said users were sending as many as 5,500 messages ("tweets") per second, which exceeds the maximum rate immediately after the death of Osama bin Laden and was "on par with" the rate after the Tōhoku earthquake and tsunami.[108]

Due to the significantly slower propagation of seismic waves compared to the near-speed-of-light transmission of internet traffic, some Twitter users read about the earthquake seconds before feeling the tremors. For example, Twitter users in such cities as New York City and Boston reported reading tweets about the earthquake from users in Washington, D.C., or Richmond, Virginia, 15 to 30 seconds before feeling the quake itself.[109]

The English version of Wikipedia had an encyclopedia article dedicated to the earthquake by 2:03 PM, 12 minutes after the event, and it was mentioned in two other Wikipedia articles even earlier.[110]

Zoo animal reactions

Staff at the Smithsonian National Zoological Park in Washington, D.C., reported that some of the animals in the park appeared to show behavior suggesting that they anticipated the earthquake from seconds to minutes before it was felt in the area. The earthquake was felt at the great ape exhibits during afternoon feeding time. About three to ten seconds before the quake, many of the apes abandoned their food and climbed to the top of a tree-like structure in the exhibit. The red-ruffed lemurs sounded an alarm call about 15 minutes before the quake, and the flock of 64 flamingos rushed about and grouped themselves together just before the quake. During the quake, some animals vocalized, some ran or dove for cover, and some stood up and stared at the walls of their enclosures. Some of the animals remained agitated for the rest of the day, while others calmed quickly.[111] This reaction was similar to that of the 5.8 Wabash Quake in 2008, which struck during early-morning feeding at the St. Louis Zoo.

References

  1. 1 2 3 4 "Magnitude 5.8 – Virginia". United States Geological Survey. Retrieved August 23, 2011.
  2. ↑ "Pager– M 5.8– Virginia". United States Geological Survey. Retrieved August 23, 2011.
  3. ↑ Jibson, R. W.; Harp, E. L. (2012), "Extraordinary Distance Limits of Landslides Triggered by the 2011 Mineral, Virginia, Earthquake" (PDF), Bulletin of the Seismological Society of America (Seismological Society of America) 102 (6): 2369
  4. ↑ "Largest Earthquakes by State: List of Earthquakes". United States Geological Survey. Archived from the original on August 24, 2011. Retrieved August 23, 2011.
  5. ↑ Nuttli, Otto W.; Bollinger, G. A. and Griffiths, Donald W. (June 1979). "On the relation between modified Mercalli intensity and body-wave magnitude". Bulletin of the Seismological Society of America 69 (3): 893–909. Retrieved January 29, 2012.
  6. ↑ Ruane, Michael E.; Aratani, Lori (August 23, 2012). "Earthquake damage to Washington Monument was very rare occurrence". Washington Post.
  7. ↑ Morello, Carol; Wiggins, Ovetta (August 24, 2011). "Region tallies earthquake damage, mostly uninsured". Washington Post.
  8. ↑ Estimate by the Oakland, California-based catastrophe modeling and risk assessment company EQECAT, which estimated further that only 5 percent of East Coast property owners have earthquake coverage.
    Hofmann, Mark A. (August 24, 2011). "Insured losses in East Coast earthquake less than $100M: EQECAT". Business Insurance.
  9. ↑ Bentley, Callan. "The Mineral, VA earthquake of August 23, 2011". AGU Blog. American Geophysical Union. Retrieved August 24, 2011.
  10. ↑ Bailey, C.M. (2004). "Shaken! Earthquake Rocks Central Virginia" (PDF). What's New in Virginia Geology. Department of Geology, College of William & Mary. Retrieved August 24, 2011.
  11. ↑ Virginia Department of Mines Minerals and Energy. "August 23, 2011 1:51 pm; 5.8 Magnitude Earthquake". Archived from the original on November 16, 2011. Retrieved September 4, 2011.
  12. ↑ Bailey, C.M. (December 22, 2011). "All Shook Up! The 2011 Virginia Earthquake". Retrieved January 14, 2012.
  13. 1 2 Phillips, Susan (August 26, 2011). "How Fracking Causes Earthquakes, But Not the One in Virginia". National Public Radio.
  14. ↑ Reader, Stephen. "Explainer: Did Hydrofracking Have Anything to Do With the East Coast Quake?". WNYC. Retrieved August 23, 2011.
  15. ↑ Gilliland, Donald (August 24, 2011). "Marcellus Shale drilling to blame for Virginia earthquake? No fracking way, industry officials say". The Patriot-News. Retrieved August 24, 2011.
  16. ↑ "Aftershock Map for Virginia". United States Geological Survey. Retrieved January 7, 2012.
  17. ↑ Pugh, Kari (August 23, 2011). "Earthquake, aftershocks rattle Northern Virginia". Inside NoVA. Archived from the original on July 22, 2012.
  18. ↑ Radnofsky, Louise; Winslow, Ron (August 25, 2011). "Magnitude 4.5 Aftershock Hits Washington, D.C., Area". The Wall Street Journal.
  19. ↑ Felberbaum, Michael (August 31, 2011). "Aftershocks Continuing". The Free Lance-Star (Fredericksburg, Virginia).
  20. ↑ "USGS Release: New Evidence Shows Power of East Coast Earthquakes (11/6/2012 8:30:00 AM)". USGS. Retrieved 6 November 2012.
  21. ↑ Michael King (August 23, 2011). "Mag 5.8 earthquake felt in Metro Atlanta". WXIA-TV. Retrieved August 23, 2011.
  22. ↑ "5.9 magnitude quake hits northeastern U.S. and Canada". Maclean's. June 20, 2008. Retrieved August 23, 2011.
  23. ↑ Rhodes, Dawn (August 23, 2011). "Illinois residents may have felt Virginia quake". Chicago Tribune. Retrieved August 23, 2011.
  24. ↑ Lee-Anne Goodman (August 23, 2011). "Earthquake rattles parts of U.S. East Coast and Canada; no serious injuries". Global Toronto. The Canadian Press. Retrieved August 23, 2011.
  25. 1 2 Doll, Jen (August 23, 2011). "Earthquake Damage in NYC Is Minimal; Mike Bloomberg Is More Concerned About Hurricane Irene". The Village Voice. Retrieved August 23, 2011.
  26. ↑ "Magnitude-5.8 Earthquake Strikes National Capital Area". United States Geological Survey. Retrieved August 24, 2011.
  27. ↑ "Magnitude 5.8 – VIRGINIA: Summary". United States Geological Survey. Retrieved August 30, 2011.
  28. ↑ Lowy, Joan (August 23, 2011). "Thousands of travelers delayed, airport towers evacuated after East Coast quake". Newser. Retrieved August 28, 2011.
  29. ↑ "5.8 magnitude quake rocks East Coast". USA Today. August 23, 2011. Retrieved August 23, 2011.
  30. ↑ "Earthquake shakes Washington". Wichita Business Journal. August 23, 2011. Retrieved August 27, 2011.
  31. ↑ "Earthquake reported along the East Coast". The Washington Post. August 24, 2011. Retrieved August 23, 2011.
  32. ↑ Lewis, Bob (August 24, 2011). "Strongest quake since '44 jars East Coast". CNSNews. Retrieved August 27, 2011.
  33. ↑ Whoriskey, Peter (August 23, 2011). "Cellphone service falls short after earthquake". Washington Post. Retrieved August 24, 2011.
  34. ↑ Melvin, Jasmin (August 24, 2011). "Quake bolsters calls for public safety wireless network". Reuters. Retrieved September 2, 2011.
  35. ↑ Bello, Marisol (August 24, 2011). "Town at epicenter assesses damage". USA Today. Retrieved August 24, 2011.
  36. ↑ Dennen, Rusty (September 2, 2011). "Rebuilding Process Begins". The Free Lance-Star. Retrieved September 5, 2011.
  37. 1 2 3 Dennen, Rusty (August 24, 2011). "Quake Damages Buildings, Causes Injuries Across Region". The Free Lance-Star. Retrieved August 24, 2011.
  38. ↑ Smith, Portsia (August 27, 2011). "Louisa Shuts Two Schools". The Free Lance-Star. Retrieved August 27, 2011.
  39. 1 2 3 Dennen, Rusty (August 26, 2011). "Culpeper, Mineral clean up". The Free Lance-Star. Retrieved August 26, 2011.
  40. ↑ "Louisa Updates Earthquake Damage Estimates". Charlottesville Newsplex. Retrieved August 31, 2011.
  41. 1 2 3 4 Dennen, Rusty (September 29, 2011). "Damage Tops $90 Million". The Free Lance-Star. Retrieved September 29, 2011.
  42. ↑ Smith, Portsia. "Louisa works on school details". The Free Lance-Star. Retrieved August 30, 2011.
  43. ↑ "5.8-magnitude quake shakes central Virginia, East Coast". Richmond Times-Dispatch. August 23, 2011. Retrieved August 24, 2011.
  44. ↑ "More checks set at Va. nuke plant". Philly.com. Retrieved August 30, 2011.
  45. ↑ Squires, Paula C. (August 31, 2011). "NRC team begins three-week review of North Anna Power Station". Virginia Business News. Retrieved September 2, 2011.
  46. ↑ Wald, Matthew (October 21, 2011). "Virginia: Nuclear Reactors Expected to Reopen Soon". New York Times. Retrieved July 16, 2012.
  47. ↑ Koch, Wendy (November 11, 2011). "Nuclear power plant shut by quake gets OK to restart". USA Today. Retrieved July 16, 2012.
  48. ↑ "Charlottesville Gas Leak Likely Triggered by Earthquake". Charlottesville Newsplex. Retrieved August 25, 2011.
  49. 1 2 Gould, Pamela (August 24, 2011). "All Shook Up: Two school divisions delay start of the school year after earthquake". The Free Lance-Star. Retrieved August 24, 2011.
  50. 1 2 Johnston, Donnie (August 24, 2011). "Seismic Event Rattles Culpeper, Injuring Two and Buckling Historic Church". The Free Lance-Star. Retrieved August 24, 2011.
  51. ↑ Champion, Allison Brophy. "Going, going, gone". News. Star Exponent. Retrieved August 30, 2011.
  52. ↑ "GCC celebrates employees' seamless handling of massive changes necessitated by quake". Germanna Community College. Retrieved January 9, 2012.
  53. ↑ Dwyer, Devin. "US Capitol, Pentagon, State Department Shaken By 5.9 Magnitude Earthquake". ABC News. Retrieved September 2, 2011.
  54. ↑ "Thomas Jefferson Theater to Close Due to Earthquake Damage". arlnow.com.
  55. ↑ "Earthquakes and Historic Alexandria". Historic Alexandria. City of Alexandria. Retrieved September 7, 2011.
  56. ↑ "Baker Report for Prince William County" (PDF). Retrieved December 10, 2012.
  57. 1 2 "Funds approved to start Lake Jackson dam repairs". Retrieved April 26, 2013.
  58. ↑ Svrluga, Susan (July 21, 2013). "Without Lake Jackson Dam, town’s summer is sunk". The Washington Post. Retrieved July 20, 2013.
  59. ↑ Harris, Paul (August 24, 2011). "US earthquake leads to evacuation of White House". The Guardian (London). Retrieved August 27, 2011.
  60. 1 2 Achenbach, Joel (August 23, 2011). "5.8 Virginia earthquake shakes East Coast, rattles residents". The Washington Post. p. 2. Retrieved January 10, 2012.
  61. ↑ Pettus, Meta (August 23, 2011). "Metro: Inspections Continue, Trains At Reduced Speed". WUSA 9. Retrieved August 24, 2011.
  62. ↑ "Washington Monument Earthquake Update". National Park Service.
  63. ↑ "Earthquake FAQ".
  64. ↑ Gilgoff, Dan; Lazo, Larry (August 23, 2011). "National Cathedral damaged in earthquake". CNN.
  65. 1 2 Boorstein, Michelle (August 25, 2011). "Earthquake-damaged Washington National Cathedral needs to raise millions". Washington Post. Retrieved August 25, 2011.
  66. 1 2 "Update on Earthquake Damage at the Smithsonian (press release)". Smithsonian Institution. Retrieved August 24, 2011.
  67. ↑ "Ecuador embassy damaged in quake". The Times of India (India). Retrieved January 11, 2012.
  68. ↑ O'Keefe, Ed (August 26, 2011). "Earthquake Damaged U.S. Treasury Building". Washington Post. Retrieved August 26, 2011.
  69. ↑ Lewis, Bob (August 24, 2011). "East Coast quake was strongest since 1944; buildings damaged". Anchorage Daily News. Retrieved January 30, 2012.
  70. ↑ Delaware Department of Transportation (August 23, 2011). "DelDOT Inspecting Infrastructure After Earthquake". Retrieved January 11, 2012.
  71. ↑ "Md. residents homeless after East Coast earthquake". ABC News. Associated Press. Retrieved August 27, 2011.
  72. ↑ "East Coast quake damages people's nerves and temple spires". KSL-TV. August 23, 2011. Retrieved August 24, 2011.
  73. ↑ "Washington County residents warned not to drink water from Yourtee Spring line". The Herald-Mail. August 24, 2011. Retrieved August 24, 2011.
  74. ↑ Jones, Kevin. "Catholic churches damaged in northeast US quake". Catholic News Agency. Retrieved January 11, 2012.
  75. ↑ "Salisbury Police Department Suffers Slight Damages In Earthquake". WMDT-TV. Retrieved August 24, 2011.
  76. ↑ "Earthquake Causes Minor Damage to Salisbury University Buildings". WMDT-TV. Retrieved August 24, 2011.
  77. ↑ "Naval Academy Damaged in East Coast Quake". Maritime Security Asia. August 24, 2011. Retrieved January 11, 2012.
  78. ↑ "Mt. Calvert Historical & Archaeological Park". Md.-Nat'l Capital Parks & Planning Commission. Retrieved September 19, 2011.
  79. ↑ "Earthquake shakes region: Temblor in central Virginia elicits unfamiliar reaction in area". The Journal. Retrieved August 24, 2011.
  80. ↑ "Earthquake in Virginia felt throughout W.Va.". Charleston Gazette. Retrieved August 23, 2011.
  81. ↑ Kuykendall, Taylor. "Southern West Virginia shakes from quake". The Register-Herald. Retrieved August 23, 2011.
  82. ↑ Elmquist, Sonja (September 16, 2011). "Patriot Slumps After Reporting Reduced Coal Output, Higher Mining Costs". Bloomerg News (Bloomberg). Retrieved September 21, 2011.
  83. 1 2 "5.9 earthquake rocks mid-Atlantic". altoonamirror.com.
  84. 1 2 3 Mandak, Joe. "Earthquake centered in Va. rolls across Pa.". Houston Chronicle. Retrieved August 24, 2011.
  85. ↑ Adler, Danny and Laurie Mason Schroeder (August 24, 2011). "Residenrs: Temblor 'bizzare' and 'scary'". The Intelligencer.
  86. ↑ Weckselblatt, Gary (August 24, 2011). "Bucks courthouse evacuated after quake strikes". The Intelligencer.
  87. ↑ Ciavaglia, Jo and Danny Adler (August 24, 2011). "Bucks, Montco rumbles". The Intelligencer.
  88. ↑ "Earthquake shakes region; buildings evacuated". Pittsburgh Post-Gazette. August 23, 2011. Retrieved February 23, 2013.
  89. ↑ Carly Q. Romalino; Jessica Driscoll (August 24, 2011). "Gloucester County suffers minor earthquake damage, reports in Woodbury, Deptford". Gloucester County Times. Retrieved August 26, 2011.
  90. 1 2 3 4 Hicks, Joshua Adam (August 24, 2011). "Rattled by earthquake, but mostly unscathed in New Jersey". The Philadelphia Inquirer. Retrieved August 26, 2011.
  91. ↑ Romalino, Carly Q. (August 27, 2011). "Woodbury city pushes for G.G. Green building demolition after quake". Gloucester County Times. Retrieved August 29, 2011.
  92. 1 2 "NY gets tremors but no damage from quake in Va". The Wall Street Journal. Associated Press. August 23, 2011. Retrieved August 23, 2011.
  93. 1 2 3 4 "USGS Community Internet Intensity Map: Virginia, August 23, 2011". United States Geological Survey. Retrieved August 26, 2011.
  94. ↑ Eaton-Robb, Pat (August 23, 2011). "Earthquake Causes Evacuation At New Haven Open". Huffington Post. Retrieved August 24, 2011.
  95. ↑ Ellement, John R.; Finucane, Martin (August 23, 2011). "Va. earthquake shakes Boston area; no damage reported". The Boston Globe. Archived from the original on January 10, 2012.
  96. ↑ Hench, David. "Mainers report feeling tremors and wondering what's shaking". Portland Press Herald. Retrieved August 24, 2011.
  97. ↑ Hunt, Spencer; Ludlow, Randy (August 23, 2011). "Virginia quake shakes up Columbus". The Columbus Dispatch.
  98. ↑ "5.9 Earthquake Rattles East Coast, Northeast Ohio". The Repository. August 23, 2011. Retrieved August 24, 2011.
  99. ↑ "Earthquake Rattles Nerves in Akron Area". Akron Beacon Journal. August 24, 2011. Retrieved August 24, 2011.
  100. ↑ Manoloff, Dennis (August 23, 2011). "Shin-Soo Choo Homer in 9th Lifts Indians past Mariners, 7-5; Rumblings from Virginia Earthquake Felt in Bottom of 3rd". The Plain Dealer. Retrieved August 24, 2011.
  101. 1 2 Gonzalez, John (August 24, 2011). "Earthquake Map: Why Michigan residents felt the Virginia Earthquake". MLive.com. Retrieved August 24, 2011.
  102. ↑ "Tremor Felt in Southwest Michigan". The Herald-Palladium. August 24, 2011.
  103. ↑ "Aftershocks hit Sudbury just before 2, police report". Sudbury Star. Retrieved August 23, 2011.
  104. ↑ "Tom Davies Square evacuated as aftershocks felt in Greater Sudbury". Sudbury Star. Retrieved August 23, 2011.
  105. ↑ "Tom Davies Square evacuated after earthquake". Northern Life. Retrieved August 23, 2011.
  106. ↑ "5.8 earthquake rattles Canada, eastern U.S.". CBC News. August 23, 2011. Retrieved August 23, 2011.
  107. ↑ "USGS Community Internet Intensity Map: Virginia". United States Geological Survey. Retrieved October 1, 2011.
  108. ↑ Kang, Cecilia (August 23, 2011). "Facebook, Twitter report record earthquake messages". Washington Post. Retrieved August 23, 2011.
  109. ↑ Rebecca Ford (August 23, 2011). "Earthquake: Twitter Users Learned of Tremors Seconds Before Feeling Them". The Hollywood Reporter. Retrieved August 29, 2011.
  110. ↑ Montgomery, David (August 24, 2011). "Minutes after Virginia earthquake, it was on Wikipedia". Washington Post.
  111. ↑ Press Release: National Zoo Animals React to the Earthquake - National Zoo| FONZ

External links

Wikimedia Commons has media related to 2011 Virginia earthquake.
This article is issued from Wikipedia - version of the Saturday, April 23, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.