Premium
Observation and implications of nonlinear elastic wave response in rock
Author(s) -
Johnson P. A.,
McCall K. R.
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl03162
Subject(s) - nonlinear system , classification of discontinuities , harmonics , elasticity (physics) , amplitude , wave propagation , geology , seismic wave , physics , geophysics , mechanics , optics , mathematics , mathematical analysis , quantum mechanics , voltage , thermodynamics
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 ultrasonic frequencies, that the effect of nonlinear elasticity on seismic wave propagation may be large, and should be considered in modeling.