Comparison of phase velocities from array measurements of Rayleigh waves associated with microtremor and results calculated from borehole shear-wave velocity profiles - Liu, Hsi-Ping; Boore, D.M.; Joyner, W.; Oppenheimer, D.; Warrick, R.E.; Zhang, Wenbo; Hamilton, J.; Brown, L.T. (Open-File Report, 2000)