Other
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..165j&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 3, p. 165-168
Other
15
Elastic Waves, Harmonics, Nonlinearity, Rocks, Seismology, Wave Propagation, Amplitudes, Equations Of Motion, Ultrasonics
Scientific paper
Experiments in rock show a large nonlinear elastic wave response, far greater than that of gases, liquids and most other solids. The large response is attributed to structural discontinuities in rock such as microcracks and grain boundaries. The magnitude of the harmonics created by nonlinear interactions grows linearly with propagation distance in one-dimensional systems. In the earth, a large nonlinear response may be responsible for significant spectral alteration of a seismic wave at amplitudes and distances currently considered to be within the linear elastic regime. We argue, based on observations at ultrasonics frequencies, that the effect of nonlinear elasticity on seismic wave propagation may be large, and should be considered in modeling.
Johnson Paul A.
McCall K. R.
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