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Earth in Reverse: Understanding Magnetic Wiggles on the Ocean Floor

Join experts Dr. Chris Massell Symons and Dr. Anthony Koppers in an engaging NSDL/NSTA Web Seminar exploring the Earth's magnetic field and its reversals. Delve into how the ocean's magnetic wiggles provide insights into past geological events and the dynamics of seafloor spreading. Discover historical data from the Mid-Atlantic Ridge and learn why magnetic north isn't at the North Pole. This seminar highlights the importance of magnetic anomalies in understanding Earth's evolution and the mysteries surrounding these phenomena.

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Earth in Reverse: Understanding Magnetic Wiggles on the Ocean Floor

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  1. LIVE INTERACTIVE LEARNING @ YOUR DESKTOP NSDL/NSTA Web Seminar: Earth in Reverse: Magnetic Wiggles on the Ocean Floor Tuesday, January 29, 2008

  2. http://nsdl.org Today’s NSDL Experts Dr. Chris Massell Symons, Researcher at the Scripps Institution of Oceanography Dr. Anthony Koppers, Associate Professor of Marine Geology and Geophysics at Oregon State University http://earthref.org/ERESE

  3. http://nsdl.org How did we get from “blue” oceans to such great detail? Magnetic Wiggles!!!

  4. http://nsdl.org Earth’s Magnetic Field

  5. http://nsdl.org BUT…..Magnetic North is NOT at the North Pole

  6. AND…the Magnetic Field Reverses • Field reverses ~1 time every 200,000 years on average. • 400 times in last 330 million years. • Last reversal was 780,000 years ago. NORMAL REVERSE

  7. http://nsdl.org Poll Question! On average, how long does each magnetic reversal take to complete? • 10,000 years • 5,000 years • 1,000 years • 100 years

  8. http://nsdl.org Let’s pause for two questions from the audience….

  9. NORMAL REVERSE MID-OCEAN RIDGE http://nsdl.org Recording the Magnetic signature

  10. http://nsdl.org Sampling the Seafloor

  11. ICELAND Mid-Atlantic Ridge http://nsdl.org Early Maps of Seafloor Anomalies Raff and Mason, 1961 Heirtzler et al., 1966

  12. http://nsdl.org Sample Profiles across Mid-Ocean Ridges

  13. http://nsdl.org Changing Spreading Rate = Modified Wiggle Pattern

  14. http://nsdl.org Shipboard Magnetic Data Across the EPR MEXICO PROFILE 1 PROFILE 2

  15. http://nsdl.org East Pacific Rise MODEL PROFILE 2 Using the marker, identify the location of the spreading ridge on PROFILE 2.

  16. http://nsdl.org Solution - Matching Peaks 2 2 3 3 1 1 MODEL PROFILE 2

  17. http://nsdl.org How fast is the East Pacific rise spreading?

  18. GREENLAND ICELAND http://nsdl.org Mid-Atlantic Spreading Ridge

  19. http://nsdl.org Data across Reykjanes Ridge

  20. What is the average spreading rate at the Reykjanes Ridge over the last 10 million years? North American Plate Eurasian Plate 1 km/my 5 km/my 10 km/my Stamp One:

  21. http://nsdl.org Let’s pause for two questions from the audience….

  22. http://nsdl.org How old are the wiggles?

  23. http://nsdl.org Time Scale

  24. http://nsdl.org EXTREME AGES • Age of the Earth ~ 4.6 Billion Years • Oldest Rock ~ 3.5 Billion Years • Oldest Mineral ~ 3.0 Billions Years • Oldest Seafloor ~ xxx ???

  25. http://nsdl.org Seafloor Age Map

  26. http://nsdl.org Dating OLDEST Seafloor

  27. http://nsdl.org Ocean Drilling Program1983-2003http://www.odplegacy.org/

  28. http://nsdl.org From seafloor to analysis to storage…..

  29. http://nsdl.org Argon-40/Argon-39 Dating

  30. http://nsdl.org Unsolved Mysteries • Why does the Earth’s magnetic field reverse? • WHEN will be the next reversal? Blue = NorthOrange = South

  31. http://nsdl.org Dr. Chris Massell Symons csymons@ucsd.edu THANK YOU! Dr. Anthony Koppers akoppers@coas.oregonstate.edu http://earthref.org/ERESE

  32. http://nsdl.org Go to http://nsdl.org and click on the K-12 audience page to: • Download our Seminar Resource List • Utilize our blog featuring our presenters for the Fall Series sharing their insights on careers in science and science education: • http://expertvoices.nsdl.org/2007fall-nsta-sems/

  33. NLC screenshot http://learningcenter.nsta.org

  34. National Science Teachers Association Gerry Wheeler, Executive Director Frank Owens, Associate Executive Director Conferences and Programs Al Byers, Assistant Executive Director e-Learning NSTA Web Seminars Flavio Mendez, Director Danielle Troiano, Project Coordinator Jeff Layman, Technical Coordinator LIVE INTERACTIVE LEARNING @ YOUR DESKTOP

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