Use of P Coda for Explosion Medium and Improved Yield Determination.
TELEDYNE GEOTECH ALEXANDRIA VA ALEXANDRIA LABS
Pagination or Media Count:
Spectral analyses of P and P coda on teleseismic recordings of nuclear explosions at Yucca Flats and Pahute Mesa regions of the Nevada Test Site NTS seem to provide explosion source medium information. The spectral ratio PP-coda on short-period vertical component records at NORSAR shows positive correlation with explosion medium velocity. It seems that the initial P from generally shallower explosions within a low velocity medium experiences significantly lower scattering Q and perhaps also inelastic Q as compared to generally deeper explosions in a high velocity medium. Near-source scattering of explosion-generated Rayleigh waves into teleseismic P also appears to play an important role. Author