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

Journal Article · Thu Jun 01 00:00:00 EDT 1995 · Geophysical Research Letters

DOI:https://doi.org/10.1029/95GL01323· OSTI ID:150485

Pyrak-Nolte, L J ^[1]; Nolte, D D ^[2]

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1. Univ. of Notre Dame, IN (United States)
2. Purdue Univ., West Lafayette, IN (United States)

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.

• OSTI ID: 150485
• Journal Information: Geophysical Research Letters, Vol. 22, Issue 11; Other Information: PBD: 1 Jun 1995
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
SEISMIC WAVES
FREQUENCY ANALYSIS
WAVE PROPAGATION
VELOCITY
DISPERSION RELATIONS
GEOLOGIC FAULTS