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Title: Wavelet analysis of velocity dispersion of elastic interface waves propagating along a fracture

Wavelet analysis of velocity dispersion of elastic interface waves propagating along a fracture A wavelet analysis is performed on seismic waveforms of elastic interface waves that propagate along a fracture. The wavelet analysis provides a direct quantitative measure of spectral content as a function of arrival time. The authors find that the spectral content of the interface wave signals is not stationary, but exhibits increasing frequency content for later arrival times, representing negative velocity dispersion. The dispersion increase from {minus}11 m/sec/MHz to {minus}116 m/sec/MHz as the stress on the fracture is increased from 3.5 kPa to 33 MPa. The negative velocity dispersion agrees with predictions from the displacement-discontinuity theory of the seismic response of fractures, and can be used to fit fracture stiffness. 16 refs., 3 figs., 1 tab.
Authors: ;
Publication Date:
OSTI Identifier:OSTI ID: 150485
Resource Type:Journal Article
Resource Relation:Journal Name: Geophysical Research Letters; Journal Volume: 22; Journal Issue: 11; Other Information: PBD: 1 Jun 1995
Country of Publication:United States
Language:English
Subject: 58 GEOSCIENCES; SEISMIC WAVES; FREQUENCY ANALYSIS; WAVE PROPAGATION; VELOCITY; DISPERSION RELATIONS; GEOLOGIC FAULTS