Publication 105
Improving Bahr's invariant parameters using the WAL approach
Marti, A., P. Queralt, A.G. Jones and J. Ledo
Abstract
In the magnetotelluric technique, several methods exist to perform dimensionality analysis of
the measured data using rotational invariants of the impedance tensor. Among these methods
there is some dilemma on the different criteria established, which sometimes lead to nonequivalent
interpretations. The aim of this work is to compare the Bahr andWeaver et al. (WAL
hereafter) methods, and to propose a new method that makes both dimensionality methods
consistent. This new method complements the parameters used in Bahr method with WAL
invariant Q, and redefines their threshold values. To accomplish this, we used the analytical
relations between both sets of parameters and re-analyse and compare the threshold values of
each method. Both the Bahr and WAL methods use sets of rotational invariant parameters of
the magnetotelluric tensor and establish a classification of their values
to determine the kind of dimensionality associated to the measured data.
Source
Geophysical Journal International, 163, 38-41, 2005.
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Alan G Jones / 21 April 2006 /
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