Geomagnetic Induction Studies in Scandinavia - II. Geomagnetic Depth Sounding, Induction Vectors and Coast-Effect
Alan G. Jones
In this paper an event of very favourable structure.
for induction purposes, which was observed by the Scandinavian
magnetometer array, is discussed and analysed in detail.
The responses derived, in both the time and frequency
domains, display a large coast effect at all coastal statiqns,
both on the sea coasts and on the Gulf of Bothnia. Two
relatively large inland anomalies are also delineated. The
more significant of the two, the Storavan anomaly, is apparent
using all the analysis techniques employed, and may
be associated with a remnant of the Svionian island arc
system. The less dominant anomaly, in the vicinity of Mieron,
has no obvious correlation with geology or tectonic formations,
and appears to be polarisation sensitive - it is only
energised by east-west magnetic fields.
First approximation modelling of the coast effect observed
by the northwestern stations illustrated that the responses are
well satisfied by the conductivity contrast between sea and
Finally, the validity of the derived induction vectors, and
the possible effects
Journal of Geophysics (Zeitschrift fuer Geophysik), 50, 23-36.
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Alan G Jones / 28 February 2010 /