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Orange Alert

Earthquake Shaking M 5.8, VIRGINIA

PAGER Version 3

Origin Time: Tue 2011-08-23 17:51:04 UTC (13:51:04 local) o o Location: 37.94 N 77.93 W Depth: 6 km

Created: 2 hours, 5 minutes after earthquake

Estimated Fatalities

Estimated Economic Losses

Orange alert level for economic losses. Significant damage is likely and the disaster is potentially widespread. Estimated economic losses are less than 1% of GDP of the United States. Past events with this alert level have required a regional or national level response.

78% 22%

1

10

10,000

100

1,000 Fatalities

9%

1%

Green alert level for shaking-related fatalities. There is a low likelihood of casualties.

1

100,000

26%

10

35%

21%

6%

1%

10,000 100 1,000 100,000 USD (Millions)

Estimated Population Exposed to Earthquake Shaking ESTIMATED POPULATION EXPOSURE (k = x1000)

- -*

19k*

9,627k*

2,285k

76k

23k

10k

0

0

Not felt

Weak

Light

Moderate

Strong

Very Strong

Severe

Violent

Extreme

none

none

none

V. Light

Light

Moderate

Moderate/Heavy

Heavy

V. Heavy

none

none

none

Light

Moderate

Moderate/Heavy

Heavy

V. Heavy

V. Heavy

ESTIMATED MODIFIED MERCALLI INTENSITY PERCEIVED SHAKING POTENTIAL DAMAGE

Resistant Structures Vulnerable Structures

*Estimated exposure only includes population within the map area.

Population Exposure 79.75°W Parsons Parsons

population per ~1 sq. km from Landscan

Inwood Inwood 77.75°W 76.75°W Charles Charles Town Town Columbia Columbia Germantown Winchester Winchester Germantown Leesburg Leesburg Stephens Rockville Stephens City City Rockville Potomac Potomac Strasburg Strasburg Reston Reston Front Royal Chantilly Chantilly WoodstockFront Royal Woodstock

Romney Romney 78.75°W

IV

Moorefield Moorefield Petersburg Petersburg

Saint Saint Charles Charles

Fredericksburg Fredericksburg Colonial Colonial Beach Beach Spotsylvania Spotsylvania Courthouse Courthouse

V Tappahannock Tappahannock

Weber City Weber City

IV

YanceyvilleRoxboro Roxboro Wentworth Wentworth Yanceyville

Selected City Exposure from GeoNames.org

Richmond Fort Fort Lee Lee Bellwood Bellwood Chester Chester Hopewell Hopewell Petersburg Petersburg

37.25°N

Waverly Waverly Wakefield Wakefield

Chase Chase City City

Norlina Norlina

Emporia Emporia

Courtland Courtland Franklin Franklin

IV

Roanoke Roanoke Rapids Rapids Murfreesboro South South Weldon Weldon Murfreesboro

PAGER content is automatically generated, and only considers losses due to structural damage. Limitations of input data, shaking estimates, and loss models may add uncertainty.

http://earthquake.usgs.gov/pager

38°N

Ashland Ashland Wyndham Wyndham Laurel Laurel

West West Lynchburg Lynchburg Blue Blue Ridge Ridge Appomattox Forest BedfordForest Bedford Timberlake Appomattox Farmville Timberlake Farmville Rustburg Rustburg Hampden Hampden Sydney Sydney Crewe Crewe Altavista North North Shore ShoreAltavista Blackstone Blackstone Brookneal Brookneal Union Union Hall Hall Victoria Victoria Gretna Gretna

Chase Chase City City Halifax Halifax South South Hill Hill km South Boston South Boston Chatmoss Chatmoss Clarksville Clarksville Danville 0Danville 25 50 Eden Eden

38.75°N

There were no earthquakes with significant population exposure to shaking within a 400 km radius of this event.

IV

Burke BurkeAlexandria Alexandria Dale Dale City CitySaint Saint Charles Charles

Burke Burke Manassas Manassas

VI

Clifton Clifton Forge ForgeLexington Lexington Buena Buena Vista Vista Glasgow Glasgow Amherst Amherst Buchanan Buchanan

Chatham Chatham

Historical Earthquakes (with MMI levels):

Washington

Mount Jackson Mount Jackson Luray Luray BroadwayStanley Broadway Stanley Culpeper Culpeper Harrisonburg Harrisonburg Bridgewater Bridgewater Grottoes Grottoes Orange Orange Verona Verona Staunton Staunton Gordonsville Gordonsville Craigsville Craigsville Waynesboro Waynesboro Charlottesville Louisa Louisa Stuarts Stuarts Draft Draft Charlottesville Lake Lake Monticello Monticello

Structures: Overall, the population in this region resides in structures that are resistant to earthquake shaking, though some vulnerable structures exist.

36.5°N

MMI City VII Louisa VI Gordonsville VI Newington VI Orange VI Weber City VI Lake Monticello V Virginia Beach V Washington IV Richmond IV Baltimore IV Annapolis bold cities appear on map

Population 2k 2k 21k 4k 1k 10k 425k 552k 191k 611k 36k (k = x1000)

Event ID: us082311a