Make us your home page
Instagram

Today’s top headlines delivered to you daily.

(View our Privacy Policy)

East vs. West quakes: Way different creatures

WASHINGTON — The East Coast doesn't get earthquakes often but when they do strike, there's a whole lot more shaking going on.

The ground in the East is older, colder and more intact than the West Coast or the famous Pacific Ring of Fire. So East Coast quakes rattle an area up to 10 times larger than a similar-sized West Coast temblor.

"They tend to be more bang for the buck as far as shaking goes," said Virginia Tech geology professor James Spotila.

Tuesday's 5.8-magnitude quake was centered in Virginia and was felt up and down the eastern seaboard for more than 1,000 miles. There hasn't been a quake that large on the East Coast since 1944 in New York.

Most of the time, quakes occur when Earth's floating giant plates shift, rub against or slip past each other. That's what happens along California's San Andreas fault when quakes happen there.

Tuesday's thrust earthquake was far from the edge of a plate — the nearest are thousands of miles away in the mid-Atlantic or California, said seismologist David Applegate, associate director of natural hazards for the USGS in Reston, Va.

The stresses that cause these kinds of quakes come from far away and mount ever so slowly over time, even building up from the retreat of glaciers at the end of the Ice Age, he said.

Another East vs. West contrast: The ground is different in the East in a way that makes the shaking travel much further, allowing people to feel the quake several states and hundreds of miles away.

The rocks in the Earth's crust in the East are colder, older and harder, which means seismic waves travel more efficiently and over greater distances. Rocks on the West Coast are relatively young and broken up by faults.

"An intact bell rings more loudly than a cracked bell and that's essentially what the crust is on the East Coast," USGS seismologist Lucy Jones said at a news conference in Pasadena, Calif.

East vs. West quakes: Way different creatures 08/23/11 [Last modified: Tuesday, August 23, 2011 11:34pm]
Photo reprints | Article reprints

© 2017 Tampa Bay Times

    

Join the discussion: Click to view comments, add yours

Loading...
  1. Rays send down Chase Whitley, Andrew Kittredge; add Chih-Wei Hu, acitvate Alex Cobb

    Blogs

    After having to cover more than five innings following a short start by Austin Pruitt, the Rays shuffled their bullpen following Wednesday's game, sending down RHPs Chase Whitley and Andrew Kittredge,

    The Kittredge move was expected, as he was summoned to add depth to the pen Wednesday in advance of RHP Alex …

  2. MLB commissioner Rob Manfred moves closer to wanting a decision on Rays stadium

    The Heater

    ST. PETERSBURG — Major League Baseball commissioner Rob Manfred called Wednesday for urgency from Tampa Bay area government leaders to prioritize and move quicker on plans for a new Rays stadium.

    MLB Commissioner Rob Manfred talks with reporters at Tropicana Field in St. Petersburg, Fla. on Wednesday, Aug. 23, 2017.
  3. Six home runs doom Rays in loss to Blue Jays (w/video)

    The Heater

    ST. PETERSBURG — A curve that didn't bounce was the difference Wednesday as the Rays lost 7-6 to the Blue Jays in front of 8,264, the smallest Tropicana field crowd since Sept. 5, 2006.

    Tampa Bay Rays shortstop Adeiny Hechavarria (11) greets center fielder Kevin Kiermaier (39) at the plate after his two run home run in the third inning of the game between the Toronto Blue Jays and the Tampa Bay Rays at Tropicana Field in St. Petersburg, Fla. on Wednesday, Aug. 23, 2017.
  4. Jones: Stop talking and start building a new Rays stadium

    The Heater

    ST. PETERSBURG — It was good to see Major League Baseball commissioner Rob Manfred at Tropicana Field on Wednesday, talking Rays baseball and the hope for a new stadium somewhere in Tampa Bay.

    Commissioner Rob Manfred is popular with the media on a visit to Tropicana Field.
  5. Ousted to political Siberia by Corcoran, Kathleen Peters sets sights on Pinellas Commission

    State Roundup

    TALLAHASSEE — The perks of power in Tallahassee are a coveted chairmanship, a Capitol office in a prime location and a prominent seat on the House floor. Now Rep. Kathleen Peters has lost all three, but here's the twist: Her trip to "Siberia" might actually help her reach the next step on the Tampa Bay political …

    Rep. Kathleen Peters, R-South Pasadena, has been relegated to the back row in the State House chamber, moved to a fouth floor office and stripped of her job as chairwoman of a House subcommittee after a series of disagreements with House Speaker Richard Corcoran. [SCOTT KEELER | Tampa Bay Times]