In 2004 I had posted information about earth conductivity in an attempt to find out more about just what mechanisms are causing this. Since that earlier post I had found the articles about p-hole conductivity in deep rock and how the charges created by earthquakes are detectable at the earth's surface and in the ionosphere.
I had made inquires to academic sources concerning a statement made in many publications concerning outdoor activity, "mines and caves are dangerous during thunderstorms". I wanted to know if the potentials within caves and mines had ever been measured. An academic source at a school of mines responded, "No, this has never been done."
A spelunker, I do not know his scientific credentials or what his day job is, published a report in National Speleological Society publication commenting on the results of an earlier study, but I have yet to find anyone that has followed up on determining the natural of the unusual results. The title of his report is “GEOPHYSICAL STUDIES AT KARTCHNER CAVERNS STATE PARK, ARIZONA”. The pdf article is just 8k.
http://www.caves.org/pub/journal/PDF...62n1-Green.pdf
Apparently, the area above underground voids exhibits an increased electric potential relative to solid areas. I want to know if this changes appreciably when there are thunderstorms overhead or nearby.
