Study of Low and Lg from Explosions and Its Application to Seismic Monitoring of the CTBT

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-to-Lg scattering by assuming that 100% of Rg is scattered very quickly into Lg with no energy loss or conversion to other phases. This is almost certainly much more Rg-to-Lg scattering than actually occurs, and we showed that even this upper bound is only comparable to or less than direct generation of Lg or of Lg generated by P-to-S conversion at the free surface.Patton and Gupta (2009) disagreed with this analysis and made five specific points, which we subsequently address. We have summarized each of their points, followed by our response.

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confidence: 70%

Reply to "Comment on 'An Upper Bound on Rg to Lg Scattering Using Modal Energy Conservation' by Jeffry L. Stevens, Heming Xu, and G. Eli Baker" by Howard Patton and Indra N. Gupta

Stevens

Baker

2010

Bulletin of the Seismological Society of America

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“…This has been interpreted as evidence of Rg scattering (e.g. Gupta and Wagner, 1998) because Rg also falls off rapidly with frequency. Goldstein (1995) however provides an alternate explanation.…”

Section: Lg Spectral Slopesmentioning

confidence: 96%

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

Stevens¹,

Baker²,

Xu³

2007

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Study of Low and Lg from Explosions and Its Application to Seismic Monitoring of the CTBT

Cited by 2 publications

References 17 publications

Reply to "Comment on 'An Upper Bound on Rg to Lg Scattering Using Modal Energy Conservation' by Jeffry L. Stevens, Heming Xu, and G. Eli Baker" by Howard Patton and Indra N. Gupta

Reply to "Comment on 'An Upper Bound on Rg to Lg Scattering Using Modal Energy Conservation' by Jeffry L. Stevens, Heming Xu, and G. Eli Baker" by Howard Patton and Indra N. Gupta

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

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