Hi Mal!
I live in an area (very Eastern part of Austria) which has GAS/OIL
resources. During the past two decades, it was common here to search for
new sources with the method you described.
As far as I know, those cables aren't carrying any kind of signal, but
rather they are used to transfer signals detected by probes
(microphones) to a central data-processing station.
The sources of this "noise" detected by the probes could be either
explosive loads, detonated in drilled holes up to some hundreds of
meters in depth, or vibrations generated by special machines. Those
machines are kind of Caterpillars with a big vibrating metal plate at
the bottom which is transferring mechanical vibrations into the ground.
>From the radiation patterns, picked up by the many probes (microphones)
which are connected via a mesh of cables, geologists can tell about the
position of a undiscovered potential Oil/Gas - field.
So as far as I know and have experienced, there is no threat to our
activities.
73
OE3GHB
Gerhard
Am Donnerstag, den 23.08.2012, 15:13 +0000 schrieb mal hamilton:
> LF/MF
> Seemingly some cables are being layed through out some parts of the UK
> for GAS es OIL exploration. These cables will will carry a signal to
> penetrate the earth and detect if gas/oil is below. There will also be
> some small explosive charges at times in the earth and these will be
> detected also by the cable and fed to a master station.
> Does anyone know what frequency is transmitted down these cables or
> mode of transmission PULSE etc
> This could be a source of QRM for the LF/MF radio amateur and most
> people do not know it is taking place and wondering where the QRM is
> coming from.
> There will be a network of cables for hundreds of miles lying on
> fields and ditches etc while the exploration is going on
>
>
> de mal/g3kev
>
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