Method and apparatus for passive detection of near-surface human-scale underground anomalies using earth field measurements
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United States of America Patent
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Aug 1, 2017
Grant Date -
Sep 18, 2014
app pub date -
Mar 14, 2014
filing date -
Mar 15, 2013
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Abstract
Methods and apparatus are provided for passively detecting the presence of near-surface human-scale underground anomalies using earth field measurements. A sensor is used to measure at least one electric or magnetic component of the Earth's electromagnetic field at a frequency of 5 kHz or greater in proximity to the Earth's surface for a given area. The measured intensities are used to identify variations indicative of the presence of a near-surface human-scale underground anomaly. Measuring the intensity of at least one component of the electromagnetic field at a plurality of frequencies of 5 kHz or greater can be used to determine the depth and characteristic of a near-surface human-scale underground anomaly.
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