By Alex A. Kaufman, A.L. Levshin

This monograph is the final quantity within the sequence 'Acoustic and Elastic Wave Fields in Geophysics'. the former volumes released by way of Elsevier (2000, 2002) dealt usually with wave propagation in liquid media.

The 3rd quantity is devoted to propagation of aircraft, round and cylindrical elastic waves in several media together with isotropic and transversely isotropic solids, liquid-solid versions, and media with cylindrical inclusions (boreholes). * incidence of actual reasoning on formal mathematical derivations * Readers wouldn't have to have a robust history in arithmetic and mathematical physics * unique research of wave phenomena in quite a few forms of elastic and liquid-elastic media

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Additional info for Acoustic and Elastic Wave Fields in Geophysics, III

Example text

In other words, it is understandable why the velocity of the bar increases with time even if the external force Fx is constant. 4. Motion of a body is accompanied by a periodic change of stress and strain at each of its points. 5. The geometric parameters of the bar and its density define a rate of change of the particle velocity v(t), that is, inertia of a body. 108) Ci where u(x,t) is the particle displacement of the bar, A and B are constants, and / and g are practically arbitrary functions of distance and time.

78. Assuming that the primary (incident) wave propagates along the x-axis, it is obvious that in the first portion of the bar, (x < 0), there are two waves - the incident and reflected waves - whereas in the second portion, (x > 0), we observe the transmitted wave. 80) P2 Of course, functions u\ and u2 satisfy the wave equation at each portion of the bar. Now it is proper to make a comment. We supposed that the incident, reflected, and transmitted waves are described by the same function /Kt±|)] 24 CHAPTER 1.

8a. Because of this force, a wave arises and propagates toward the opposite face. Since the volume is very small, the wave reaches the back face very quickly and the same force Fy acts on a medium behind the volume. 4 HOOKE'S LAW FOR SHEAR STRESSES AND TORSIONAL WAVES... 8: (a) Transmission of the shear force (b) Illustration of eqs. 128 (c) Stresses inside elementary volume (d) Forces acting on the rectangular parallelepiped aibiCidi 44 CHAPTER 1. HOOKE'S LAW, POISSON'S RELATION AND WAVES... —Fy.

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