Physics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3757b&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 19, p. 3757-3760
Physics
8
Geomagnetism And Paleomagnetism: Geomagnetic Induction, Information Related To Geographic Region: South America
Scientific paper
Long-period magnetotelluric investigations were carried out along two transects traversing the Southern Chilean Andes from the Pacific Ocean until the Argentinian border near latitude 39°S to study the mid- and deep-crustal distribution of electrical conductivity. Dimensionality analysis showed that the MT data may be regarded as 2-D with the exception of areas in the Longitudinal Valley and the region east of the volcanic chain; a subsequent multi-site decomposition of magnetotelluric impedances yielded approx. N-S regional strike directions for most parts of the two profiles. First 2-D inversion revealed a zone of moderately high conductivities (approx. 0.1 S/m) in the deep crust below the active volcanic arc, extending eastwards to the Argentinian border. Inversion results of both profiles are very similar, except of a good mid-crustal conductor in the Longitudinal Valley, which only appears in the north and may image a fault zone running obliquely to the main South Andean structures.
Brasse Heinrich
Soyer Wolfgang
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