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In a sense the thread title is outdated then, correct?
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The thread title was valid when it was first started, the knowledge about p-hole activity came about while researching "earth conductivity" issues. P-hole activity can occur in rock that contains no quartz, but unless the rock is pure quartz P-hole activity could be present at the same time piezoelectric action occurs (wonder how one would measure that?).
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What instrument is suitable to measure the currents near & in caves? I have lava tube caves in my area.
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I have posed that question to some of my correspondents whether "field mills" would be suitable for detecting the differences in the electric potential at the surface over voids. They are the only device that I know of that senses the potential of an electric field without an interconnection. It is the instrument of choice for measuring the relative electric field intensity at the earth's surface and in the atmosphere. I was told by a Professor of Earth Sciences that the potentials in caves and mines had never been measured, so what instrument is suitable there is not known. I suspect a field mill or similar differential detector device would have to be used.
Anytime you run a wire from the surface into an underground cavity it will disrupt the natural field, thus battery operated devices would have to be used to measure and record information. As noted in my previous post, there are few reports on the subject of measuring potential differences over underground voids.
