Wave properties

Wave properties - Chapter1GeneralPropertiesofWaves...

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Chapter 1- General Properties of Waves Reflection Seismology Geol 4068 Elements of 3D Seismology , 2nd Edition by Christopher Liner
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Outline-I General Properties of Waves  Physical Assumptions  Wave descriptions Body waves Surface waves Particle motion
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General Properties of Waves   Wave descriptions Graphical Mathematical Outline-II
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General Properties of Waves   General theorems and principles Reciprocity Theorem Fermat’s Principle Snell’s Law, Conservation of ray  parameter, critical angle Huygen’s Principle Outline-III
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Outline-I General Properties of Waves  Mechanical definition of a wave  Physical Assumptions  Wave descriptions Body waves Surface waves Particle motion
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t1 t2 t3 Homogeneous, isotropic medium … cylindrical  wavefronts-- rays are at right angles to  the wavefronts   Mechanical definition of a wave  Physical Assumptions
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t1 t2 t3 Anisotropic-- rays are  not at  right angles to the  wavefronts! Can be 10-20%   Mechanical definition of a wave  Physical Assumptions
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General Properties of Waves  Mechanical definition of a wave  Physical Assumptions  Wave descriptions Body waves Surface waves Particle motion
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Body Waves Direction of propagation of the body  wave Direction of particle  displacement Direction of propagation of the body  wave Direction of particle  displacement X Y Z Direction of propagation of the body  wave Direction of particle  displacement
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Body Waves - do not require a boundary to  travel Direction of propagation of the body  wave Direction of particle  displacement X Y Z SV Direction of propagation of the body  wave Direction of particle  displacement Direction of propagation of the body  wave Direction of particle  displacement SH P
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General Properties of Waves  Mechanical definition of a wave  Physical Assumptions   Wave descriptions Body waves Surface waves Particle motion
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Surface Waves X interface below a fluid (e.g., atmosphere or water) complex  particle motions in the rock are generated, such as Rayleigh  waves (air/rock) or Stonely waves (water /rock). These  motions   are retrograde elliptical at shallow depths to prograde elliptical at  increasing depths. SH waves can be trapped through multiple internal reflections in  layers near the surface and these can generate Love waves
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Surface Waves X Z Amplitude of Rayleigh wave decays with depth Adapted from Aki and Richards, 2002, p. 156
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 Mechanical definition of a wave
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This note was uploaded on 01/06/2012 for the course GEO 4068 taught by Professor Lorenzo during the Fall '10 term at LSU.

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Wave properties - Chapter1GeneralPropertiesofWaves...

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