MGDS References
Moschetti, M.P., M.H. Ritzwoller, and N.M. Shapiro, "Surface wave tomography of the western United States from ambient seismic noise: Rayleigh wave group velocity maps", Geochem Geophys Geosyst, 8: , 2007, DOI 10.1029/2007GC001655. (View Reference)
