An Upper Bound on Rg to Lg Scattering Using Modal Energy Conservation

The Physical Basis of the Explosion Source and Generation of Regional Seismic Phases

“…They also provide an estimate of the effect of topographic scattering on the contribution of trapped pS to Lg. Modal scattering calculations (Stevens, et al, 2007) complement these results with a much more concrete estimate of the upper bound of the possible contribution of scattered Rg to Lg.…”

“…Most have focused on demonstrating the feasibility of the mechanism. Attempts have also been made to quantify the contribution to Lg from scattered Rg (Stevens et al, 2007). Stevens et al (2007) provide an explicit upper bound on the amplitude of Lg attainable from Rg.…”

“…Attempts have also been made to quantify the contribution to Lg from scattered Rg (Stevens et al, 2007). Stevens et al (2007) provide an explicit upper bound on the amplitude of Lg attainable from Rg. We use those results below to compare the maximum attainable Lg amplitude due to Rg scattering with Lg due to S*, pS, and direct S from nonspherical source elements.…”

“…To determine an upper bound on Lg from scattered Rg from both explosion and CLVD sources, we use a modal scattering calculation (Stevens et al 2007). In this calculation, all Rg energy is instantaneously forward scattered into higher modes and energy is conserved.…”

Comment on "An Upper Bound on Rg to Lg Scattering Using Modal Energy Conservation" by Jeffry L. Stevens, Heming Xu, and G. Eli Baker

“…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).…”