Patent ID: 9719343
Date: 2017-08-01
CPC Classifications: E21B,G01V

Claim:
1. A method for detecting a human-scale, subsurface anomaly at near-surface depths below an area of the Earth's surface, the method comprising: suspending a sensor for measuring one or more components of an electric field of the Earth's electromagnetic field over the area proximate to, non-contacting, and just above the ground-air barrier; measuring the intensity of the one or more components of the electric field over the area at a selected frequency by the sensor, wherein the sensor is in communication with a computer, wherein the selected frequency is a function of relative permittivity, relative permeability, and a resistivity of earth; and comparing said measurements at said selected frequency to identify a change in the intensity of said electric field within the area by the computer to detect the presence of a human-scale, subsurface anomaly at a near-surface depth below the area.