2. Seismic wave propagation

2. Seismic wave propagation - 2. Seismic Wave Propagation...

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2. Seismic Wave Propagation Kurt J. Marfurt CPSGG The University of Oklahoma 2-1 Introduction to Petroleum Geology and Geophysics
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Learner Objectives After this section, you will be able to: Differentiate between P- and S-waves by their velocities and polarization Differentiate between body waves and various kinds of surface waves Derive Snell’s Law from Fermat’s principle of least time 2-2
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Types of seismic waves 1. Body waves— pass through the interior of a body 2. Guided waves— are confined to a layer within or surface of a body Two vectors are needed to characterize each wave type: • A vector in the direction of propagation; • A vector in the direction of particle (or ground) motion. Ground motion can be displacement from a rest position, velocity (first derivative in time of displacement ), or acceleration (second derivative in time of displacement). Which one is measured depends on the type of geophone. 2-3
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Body Waves Compressional waves Particle motion is in the direction of propagation Compression and rarefaction occur at any point as a function of time Example of a compressional wave along a 1D elastic rod: 2-5 (Dobrin, 1988)
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Compressioanl wave 2-7 (http://web.ics.purdue.edu/~braile/edumod/waves/WaveDemo.htm) P W a v e r t i c l M o n
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2. Seismic wave propagation - 2. Seismic Wave Propagation...

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