Seismic visibility of fractures
Conference
·
OSTI ID:6967896
Laboratory measurements of seismic travel times of compressional waves, propagated through both intact and naturally fractured specimens of quartz monzonite, were used to determine velocities of propagation. Velocities calculated from a quasi-static model were found to be too low compared to the measured velocities. A theoretical velocity is derived, based on the displacement discontinunity model of wave propagation across a fracture, which depends on the dynamic stiffness of the fracture and on frequency. Comparisons of the measured velocities and those computed from the theory agreed, and confirm the appropriatness of the displacement discontinuity model to simulate wave propagation across the fracture. From this model, changes in group time delay and signal amplitude occur at the fracture and are not distributed throughout the rock. These effects are a function of frequency and the stiffness of the fracture. This suggests that the use of seismic tomographic techniques would yield both the location and mechanical properties of discrete fractures.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6967896
- Report Number(s):
- LBL-25310; CONF-870625-21; ON: DE88012023
- Country of Publication:
- United States
- Language:
- English
Similar Records
Seismic visibility of fractures
Transmission of seismic waves across single natural fractures
Anisotropy in seismic velocities and amplitudes from multiple parallel fractures
Thesis/Dissertation
·
Thu Dec 31 23:00:00 EST 1987
·
OSTI ID:6720988
Transmission of seismic waves across single natural fractures
Journal Article
·
Sun Jun 10 00:00:00 EDT 1990
· Journal of Geophysical Research; (United States)
·
OSTI ID:5009570
Anisotropy in seismic velocities and amplitudes from multiple parallel fractures
Conference
·
Tue Jul 10 00:00:00 EDT 1990
· Journal of Geophysical Research; (United States)
·
OSTI ID:5386950