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System and method for earth probing with deep subsurface penetration using low frequency electromagnetic signals

  • US 5,357,253 A
  • Filed: 04/02/1993
  • Issued: 10/18/1994
  • Est. Priority Date: 04/02/1993
  • Status: Expired due to Fees
First Claim
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1. A system for earth exploration by generating and radiating low frequency electromagnetic energy deeply into the earth and analyzing return information, the system comprising:

  • a) means for generating a series of pulsed electromagnetic signals in a low frequency range less than about 3 Megahertz, so as to form a series of electromagnetic pulses having respective spectra which collectively cover a portion of the low frequency range that is substantially larger than any individual pulse'"'"'s spectrum;

    b) means for radiating the electromagnetic pulses into the earth, so as to penetrate the earth to substantial depths;

    c) means for detecting electromagnetic reflections from subsurface layers or objects; and

    d) means for extracting deep subsurface return information from the electromagnetic reflections.

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