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The frequency variation of the electrical parameters of a ssimple of Nevada tuff is modeled by a Debye relaxation model. Less success occurs for similar modeling of a dry granite sanaple. Data from R. L. Ewing are used to estimate the secondary electron mean lifetime in the dry granite sample as 2 x 10"^" sec with a mobility of 111 esu. Difficulties with similar estimates for tuff are mentioned, together with resulting uncertainty in calculated electromagnetic fields close to an underground nuclear explosion. Appendices show that the model obeys the KramersKronig relation and contain discussion of an interpretation of large dielectric constants.

MODELS FOR ELECTROMAGNETIC PULSE PRODUCTION FROM UNDERGROUND NUCLEAR EXPLOSIONS. PART IV. MODELS FOR TWO NEVADA SOILS.