L12_WavesAndRays-page11

L12_WavesAndRays-page11 - P alone. The significant...

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Applied Geophysics – Waves and rays - I Head wave You can see: a head wave, trapped surface wave, diving body wave Applied Geophysics – Waves and rays - I Factors affecting velocity ρ µ κ 3 4 + = P V = S V Density – velocity typically increases with density ( κ and µ are dependant on ρ and increase more rapidly than ρ ) Poisson’s ratio – related to V P /V S This is used to distinguish between rock/sediment types. It is usually more sensitive than just V
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Unformatted text preview: P alone. The significant variations in sediments are usually due to porosity variations and water saturation. Water saturation has no effect on V S (for low porosities) but a significant effect on V P . Porosity and fluid saturation Increasing porosity reduces velocity. Filling the porosity with fluid increases the velocity. M F sat V V V φ − + = 1 1...
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This note was uploaded on 01/07/2012 for the course PHYSICS 384 taught by Professor Wei during the Spring '09 term at SUNY Stony Brook.

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