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Resistivity
Resistivity has played a part in geophysics for many years, and is an
established and fundamental technique towards understanding the earth’s
makeup.
Traditional methods of resistivity sounding employed the Wenner or Schlumberger
techniques, however resistivity has in recent years seen a radical change
to deployment methods, and applications.
With the introduction in the late 1980’s of the resistivity imaging
technique, a number of electrodes (initially 25) would be addressed, alternating
from current to potential electrode by way of a computer program. The
use of such a program allows for a large number of electrodes to be sequenced
in differing order and with varying spacing thus offering automation of
the entire operation. The result of such automation is to produce pseudo-sections
of the ground below the electrodes of apparent resistivity, and with a
suitable inversion program such as RES2DINV or RES3DINV, applied resistivity
values are obtained.
With the introduction of larger systems employing greater numbers of electrodes,
much longer profiles can be obtained. Allied Associates offer the Allied
Tigre systems, which can deploy up to 128 electrodes from a single instrument,
which offers the user long profile options and increased resolution at
depth.
The resulting benefit of such imaging has offered a further dimension
in understanding the often-complex make-up of ground conditions.
Applications include:
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Allied
Associates
Concept House, 8 The Townsend Centre, Blackburn Road,
Dunstable, Bedfordshire, ENGLAND, LU5 5BQ
Telephone: +44 (0) 1582 606 999
Facsimile: +44 (0) 1582 606 991