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SOEE2102 – Geophysical Field Trip and Tutorials Malham Tarn (North Yorkshire) October 2009 Refraction Analysis Sebastian Rost University of Leeds 2009
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Traveltime Curves
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Peaceful Nuclear Explosions
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Traveltime Curves
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At critical distance: r = 90 i c = critical angle
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Courtesy of M. Thorne (Univ. Utah) Seismic Wavefield and Seismic Raypaths
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Traveltimes Direct wave: (from velocity = distance / time ) x
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Refracted Wave: Snell’s Law
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Different ways to express the refracted traveltime curve Intercept time
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Crossover distance: T direct = T refracted X cross > 2z
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Field Experiment
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Shot point geometries 12 element geophone spread Possible shot point locations
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Off end reverse shot
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Sat On end Forward
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Sat On end reverse
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Traveltime picks (from Claritas)
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Traveltime Curves
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