MT and reflection: an essential combination
At many localities in the world there have been coincident
comprehensive electromagnetic (EM) studies and seismic reflection profiles
conducted. Unfortunately, over many more regions the seismic reflection
images are interpreted without the constraints afforded by electrical
conductivity information. This paper is an attempt to convince the reader that
a collocated magnetotelluric (MT) study should, in almost every case, be
made wherever a seismic reflection survey is undertaken. Examples are shown
from six studies in which the EM results aided the geologicaYtectonic
interpretations of the seismic sections.
Also, difficulties with the MT technique are discussed, and the
interpretations of conducting zones within the lower crust are examined.
Finally, a generalised model is proposed for the continental crust that may
account for both the reflectivity and conductivity of the zone at the top of the
Geophysical Journal of the Royal Astronomical Society, 89, 7-18, 1987.
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Alan G Jones / 8 October 2007 /