ERSC 3V93 Lecture Notes - Lecture 44: Seismic Wave, Seismology, Phase Velocity
4 May 2016
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Document Summary
Use artificial sound source to generate compressional (p-waves) in ground record travel times of reflected and refracted p-waves reflected/refracted at contrasting v and boundaries with. Sound waves propagated in solids (e. g. the ground) are called elastic waves: body waves - propagate through body of an elastic solid, surface waves - propagate along free surface or at boundary between dissimilar solids. S-waves - shear (secondary) waves particles oscillate at right angles to direction of travel. Rayleigh waves- elliptical retrograde particle motion displacements decrease with depth slower than s-waves (= 0. 9 vs) Love waves propagate at boundary between high/low velocity layers particle motion parallel to free surface transverse to direction of propagation. A seismic pulse in isotropic medium propagates at the same velocity in all directions as a spherical wavefront ray is a two-dimensional representation of a single pathway. As p wave propagates it is attenuated due to several factors including: spherical divergence (geometric spreading) absorption.
