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

Science Applications International Corporation , 10260 Campus Point Drive, San Diego, California 92121 Jeffry.L.Stevens{at}saic.com Heming.Xu{at}saic.com Glenn.E.Baker{at}saic.com

We use conservation of energy to place an upper bound on Lg generated by explosions through Rg scattering. We assume that all energy in Rg scatters very rapidly into the higher mode surface waves that make up Lg. We consider Rg generated directly by the explosion source and by a collocated but possibly shallower compensated linear vector dipole (CLVD) source. Rg scattering may be a viable mechanism for generating Lg at low frequencies (<1 Hz), but at higher frequencies Lg generated directly by the CLVD or explosion source is comparable to or greater than the upper bound on Lg generated by Rg scattering. For shallow sources at frequencies up to 2–3 Hz the direct CLVD waves may be smaller than the direct explosion or the upper bound limit on the scattered waves. Either the direct waves or scattering from the spherical explosion Rg will dominate over scattering from the CLVD generated Rg at all frequencies.

Related articles in Bulletin of the Seismological Society of America:

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

Howard J. Patton and Indra N. Gupta
Bulletin of the Seismological Society of America 2010 100: 408-415. [Extract] [Full Text]  

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

Jeffry L. Stevens, Heming Xu, and G. Eli Baker
Bulletin of the Seismological Society of America 2010 100: 416-421. [Extract] [Full Text]  

This article has been cited by other articles:

				H. J. Patton and I. N. Gupta Comment on "An Upper Bound on Rg to Lg Scattering Using Modal Energy Conservation" by Jeffry L. Stevens, Heming Xu, and G. Eli Baker Bulletin of the Seismological Society of America, February 1, 2010; 100(1): 408 - 415. [Full Text] [PDF]

				J. L. Stevens, H. Xu, and G. E. Baker 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 Bulletin of the Seismological Society of America, February 1, 2010; 100(1): 416 - 421. [Full Text] [PDF]