<thinks> I also supplied my friend with this * as he insisted that when at some locations his equipment developed problems he couldn't explain.
*
http://www.reeves.nl/upload/AustraliaMag1993title.bmp
(with the right equipment one can focus down on a small area, it is a phenomena related to the underlying geology being a medium for the magnetic forces generated deep within the earth due to the torsion and pressure and heat involved in metallic magmas, or in the case of a large quartz seam, producing piezoelectricity - and different 'rocks' create different types of resultant energies)
Since it is related to the geology of an area ... I wonder if there are any connections with 'sacred sites' , 'spiritual centres' etc ?
I have definitely experienced this, the effect of being able to perceive the same energy in different forms - better in some places than in others.
The great Australian artist Ainslie Roberts has written some very interesting stuff about this !
" Of all the sacred places that Ainslie Roberts visited in Central Australia, Palka Karrinya had the most profound influence. He believed that Universal archetypes manifested through myths and could be channelled by the artist. Mountford felt the original spirit of the land could be accessed through the ceremonies, art and myths of the Aborigines and glimpses of ancient powers and histories as old as time itself could be experienced. They used the services of an Aboriginal guide called One Pound Jimmy who currently features on the Aussie $2 coin
" Ainslie went on to take up full time painting and the first book of his paintings of traditional indigenous beliefs and practises called ‘The Dreaming’ was published in 1965 and it helped to fill the abyss that existed between the general Australian public and the rich and ancient cultural heritage of Australia."
Site:
http://www.veniceclayartists.com/wp-content/uploads/2013/11/Following-Warburton-s-1873-.jpg
Ainsley's paintings:
http://www.veniceclayartists.com/wp-content/uploads/2013/11/PalkaKarrinyaAinslieRoberts.jpg
&
http://press.anu.edu.au/dtf/html/images/08_rose-1.jpg
(You should read his bio about what happened to him when they went to spend a night at some sacred sites ! He became transformed from some useless depressive guy in Adelaide that drove his wife and friend so nuts, they bought him a one-way ticket to central Australia
.. he changed from a 'self-confused nobody' into one of our greatest and acclaimed artists (not without great effort and challenge though. )