A recent short note by Stevens et al. (2009a) presents upper bound estimates of Rg-to-Lg scattering amplitudes using an energy conservation approach for plane-layered Earth models. Their results are based on calculations for two velocity models, one for low-velocity structures at the Nevada Test Site (NTS) and the other for high-velocity structures at the Semipalatinsk Test Site (STS). Stevens et al. (2009a) conclude that for low-velocity structures Rg-to-Lg scattering is a viable mechanism only for Rg waves excited by the spherical source below 0.3 Hz; direct Lg from the spherical source will dominate above 0.3 Hz;...

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