Method and apparatus for transmitting electromagnetic signals into the earth at frequencies below 500 KHz from a capacitor emplaced on the surface of the earth or raised aloft in an aircraft

摘要: A method and apparatus comprising four co-planar metallic plates, two for transmission reception, in which each pair of co-planer plates overall length L are disposed either direct contact with the earth or elevated a distance Z above to form capacitor if Z=0 Z>0, air space earth. short voltage current pulse is applied this via transformer magnetic flux adjusted provide desired frequency composition air-earth propagation medium. This results controlled electromagnetic radiation into targeted subterranean geology at frequencies <500 KHZ. In preferred embodiment, that has propagated through subsurface iterated against theoretical model vertically traveling up-going down-going waves get solution magnitude electrical properties as function depth medium these have traveled. Electrical property vs profiles relative dielectric conductivity addition wave velocity attenuation rate recovered by iteration. For operation altitude surface earth, size capacitor, L, can be specified use spectrum below 500 khz.