http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Variation of seismic-wave velocities in westerly granite under stress
about 6%. The shear-wave velocity increased by different
amounts in different directions. The amount of increase
anisotropy. In this study P- and S-wave velocities were
closure of cracks. Previous studies have shown that, if a
cracked rock is subjected to three mutually perpendicular
direction of the maximum stresses and about 3% along the
direction of the minimum stresses and showed an anisotropy of
direction parallel to the minimum stress axis. Furthermore,
directions (if any) and the type of stress-induced
directions at zero pressure suggests an isotropic rock
measured in a cubic sample of Westerly granite subjected to
parallel to the maidmum stress axis and minimum in the
ranged from 3.4% to about 6%. The anisotropy in S-wave
rupture pressure, this velocity increase occurs due to the
sample. The P-wave velocity increased by about 9% along the
Seismic-wave velocities in cracked rocks increase with
some investigators have been able to relate the pattern of
stress. It is believed that, within less than half the
stresses, the velocity increase is maximum in the direction
The general agreement in the velocity values in different
two perpendicular axial stresses (ranging from 0 to 7.0 MPa).
velocity increase with stress to the preferential crack