USGS Live

USGS Live

@USGSLive

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Reston, VA · http://usgs.gov

Tweets

  1. Feb 7

    Join us March 6th for our lecture on Geomagnetism with Dr. Jeffrey Love. See you then!

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  2. Feb 7

    Here's David Powars with part of a meteorite

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  3. Feb 7

    And that's it! Thanks for joining us tonight! Learn more about the Impact Crater:

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  4. Feb 7

    DP: So even though it happened 35 million years ago, the Impact Crater is still important to us today

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  5. Feb 7

    DP: The most recent significant earthquake in the area was in 1995

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  6. Feb 7

    DP: In addition, the continued activity of the crater is part of why there's seismic activity in the area

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  7. Feb 7

    DP: The subsiding of the crater also helps explain why there's more sea level rise in the than other places

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  8. Feb 7

    DP: Only after it clears the crater does the water then turn and flow out to the Atlantic Ocean

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  9. Feb 7

    DP: If you look at the direction of the flow of water in the , it flows directly to the crater

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  10. Feb 7

    DP: Because the crater is subsiding, it lowers the local area, drawing river flows to it

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  11. Feb 7

    DP: As the crater continues to subside, it affects us in that it helped form the as it is today

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  12. Feb 7

    DP: Now, the crater has not been still throughout time. It has slowly been subsiding, or sinking

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  13. Feb 7

    DP: Tektites are fuzed minerals created when silicon is shocked, such as from an impact

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  14. Feb 7

    DP: Another long-standing mystery we solved was why tektites were found all over the eastern U.S. from Houston to NYC to Miami

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  15. Feb 7

    DP: Here's what the crater looks like via cross-section:

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  16. Feb 7

    DP: People kept finding saltwater in wells where there shouldn't be any. They thought they must have been over-pumping

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  17. Feb 7

    DP: The crater also helped us explain a long-standing puzzle--the inland saltwater intrusion of Central Virginia

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  18. Feb 7

    DP: The smoking gun was the shocked minerals we found in the cores. There's no other way for those minerals to form except impacts

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  19. Feb 7

    DP: We worked with oil companies to use some of their overburden seismic data, which helped prove what the cores showed us

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  20. Feb 7

    DP: After obtaining more cores and exhausting other ideas, we hypothesized that it might be a crater

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