Rg scattering has often been suggested as the source of the regional Lg phase generated by explosions (e.g., Patton and Taylor, 1995; Gupta and Wagner, 1998). The main point of our paper (Stevens et al., 2009) was that it is very difficult to get enough energy out of Rg to generate the observed Lg and that direct generation of S by the source or pS conversion are likely to be stronger sources of Lg than Rg scattering. To compare the contributions of each mechanism, we derived an upper bound on the possible size of Rg...

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