Exploring Earths structure using Occams Razor

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Exploring Earths structure using Occams Razor
Prepared by Michael Hubenthal, IRIS Consortium
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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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Station
Path of energy
Geocentric Angle
Epicenter
Creating our homogenous model
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Station
Path of energy
Geocentric Angle
Epicenter
Creating our homogenous model What model data can
we collect to compare to observed data?
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• Creating a travel-time plot
• Work in teams of 4, with 2 pairs of 2
• Each pair calculates 4 travel times
• 0-90 degrees or 91-180 degrees
• Each team makes 1 travel time plot, 0-180 degrees
• Discuss results
• Use velocity11 km/sec, distance scale 320 km/cm

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?
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What has your data established so far?
Have we found any layers?
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http//rev.seis.sc.edu/
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First Arrivals
1st 1 deg - .5 min2nd 16 deg - 3.5 min
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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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