TWO FACTORS INFLUENCING THE ANOMALY OF WAVE VELOCITIES

[1] Kondratenko, A. M., and I. L. Nersesov, Some results of the study on change in the velocity of longitudinal wave and relation between the velocities of longitudinal and transverse waves in focal zone, Trudy. Inst. Fix. Zemli, 25, 130—150, 1962.

[2] Nersesov, I. L., A. N. Semenov, and I. G. Simbireva, Space—time destribution of the travel time ratios of transverse and longitudinal waves in the Garm area, The Physical Basis of Foreshocks, Nauka Publishers, Moscow, 1969.

[3] Whitcotnb, J. H., J. D. Garmany, and D. L. Anderson, Earthquake prediction: Variation of seismic velocities before the San Fernando Earthquake, Science, 180, 632—635, 1973.

[4] Ohtake, M., Change in the V_p/P_s ratio related with occurrence of some shallow earthquakes in Japan, J.Phys.Earth,21. 173—184,1973.

[5] Brace, W.F., B. W. Paulding,and C. Scholz, Dilatancy in the fracture of crystalline rocks, J. Geophy.Res, 71, 3939—3953,1966.

[6] Mjachkin, V. I, W. F. Brace, and G. A. Sobolev, Tow models for earthquake forerunners,Pageoph, 133, 169—181,1975.

[7] Nur, A., Dilatancy, pore fluids and premonitory variation of t_s/t_p travel times, Bull. Seismol. Soc. Amer, 62, 1217—1222, 1972.

[8] Gupta, I. N., Seismic velocity in rock subjected so axial loading up to shear fracture, J. Geophys. Res, 78, 6936—6942, 1973.