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Exploring Earth’s structure using Occam’s Razor

Exploring Earth’s structure using Occam’s Razor. Adapted from Braile, 2000 & DLESE Teaching Boxes, 2008. Prepared by Michael Hubenthal, IRIS Consortium. What is inside ?. How do you know what is inside?. What is inside here?. How do you know what is inside?. Think, Write, Pair, Share.

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Exploring Earth’s structure using Occam’s Razor

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  1. Exploring Earth’s structure using Occam’s Razor Adapted from Braile, 2000 & DLESE Teaching Boxes, 2008 Prepared by Michael Hubenthal, IRIS Consortium

  2. What is inside ? How do you know what is inside?

  3. What is inside here? How do you know what is inside? Think, Write, Pair, Share

  4. How do you know?

  5. Occam’s Razor - All other things being equal, the simplest solution is the best Based on your “evidence” what is beneath our feet?

  6. Calvin and Hobbes by Bill Watterson Why are model important in science?

  7. Could this help us test our model?

  8. Theoreticians Seismologist

  9. Theoreticians Seismologist

  10. Earth’s surface Center of the Earth Scale model of a homogeneous Earth

  11. 140°

  12. Seismologists Theoreticians

  13. Creating a travel-time plot • Work in teams of ~ 2 • Each pair calculates 3 travel times • Each team makes 1 travel time plot, 0-180 degrees • Discuss results • Use velocity=11 km/sec, distance scale 320 km/cm 10 30 40 50 70 80 100 115 130 150

  14. What is the cause of model and observations mismatch?

  15. Shadow zone Something changes beyond ~110 deg.

  16. Combine results from multiple earthquakes Assumptions?

  17. ?

  18. What has your data established so far? Have we found any layers?

  19. First Arrivals 1st: 1 deg - .5 min2nd: 16 deg - 3.5 min

  20. http://rev.seis.sc.edu/

  21. Updated Version http://rev.seis.sc.edu/ > DLESE Teaching Boxes!

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