Exploring Earths structure using Occams Razor

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Exploring Earths structure using Occams Razor
Adapted from Braile, 2000 DLESE Teaching Boxes,
2008
Prepared by Michael Hubenthal, IRIS Consortium
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What is inside ?
How do you know what is inside?
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What is inside here?
How do you know what is inside?
Think, Write, Pair, Share
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How do you know?
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Occams Razor - All other things being equal, the
simplest solution is the best
Based on your evidence what is beneath our feet?
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Calvin and Hobbes by Bill Watterson
Why are model important in science?
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Could this help us test our model?
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Theoreticians
Seismologist
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Theoreticians
Seismologist
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Earths surface
Center of the Earth
Scale model of a homogeneous Earth
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Seismologists
Theoreticians
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• 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 velocity11 km/sec, distance scale 320 km/cm

10 30 40 50 70 80 100 115 130 150
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What is the cause of model and observations
mismatch?
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Shadow zone Something changes beyond 110 deg.
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Combine results from multiple earthquakes Assump
tions?
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?
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What has your data established so far?
Have we found any layers?
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First Arrivals
1st 1 deg - .5 min2nd 16 deg - 3.5 min
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