Interesting equipment these European experimenters use.
 
http://www.vlf.it/
 
 
Some puzzling peaks at ~ 12 KHz & ~ 22 KHz
 
http://www.vlf.it/ed/earthprobes.html
 
 
Very Low Frequency (VLF) 9 KHz to 30 KHz:
 
http://www.jneuhaus.com/fccindex/10_khz.html#10_KHz

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