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L15_SeismicReflectionII-page12

L15_SeismicReflectionII-page12 - Shorter wavelength...

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1 Applied Geophysics – Seismic reflection II Resolution of structure Consider a vertical step in an interface To be detectable the step must cause an delay of ¼ to ½ a wavelength This means the step (h) must be 1/8 to ¼ the wavelength (two way traveltime) Example : 20 Hz, α = 4.8 km/s then λ = 240 m Therefore need an offset greater than 30 m
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Unformatted text preview: Shorter wavelength signal (higher frequencies) have better resolution. What is the problem with very high frequency sources? Applied Geophysics – Seismic reflection II Resolution of structure When you have been mapping faults in the field what were the vertical offsets?...
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