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Hi Seasmith. I am sure that, in regards to your obvious current level of knowledge on the subject of transducers, you are smart enough here to realise the full implications behind my statement in the article. It is for that reason that this is a highly confidential area so I am unable to give you the precise information you would like. However I am quite happy to point you in the direction of the original research. This was done by a man called Louis Rota, an Italian/French scientists who called his transducers 'Blocks' which he buried in the ground. If you search online you will be able to find schematics of his work and enough detail to start your own research.You are right about the frequencies, they are down at the microhertz levels but I can tell you that the transducers do not pick these up directly. Not even supercooled gravimeters in Antartica can get down past 2500 microhertz. Regards Rory