Structural electrical anisotropy in the crust at the South-Central Chilean continental margin as inferred from geomagnetic transfer functions

Details Structural electrical anisotropy in the crust at the South-Central Chilean continental margin as inferred from geomagnetic transfer functions Structural electrical anisotropy in the crust at the South-Central Chilean continental margin as inferred from geomagnetic transfer functions

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pepi..173....7b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 173, Issue 1-2, p. 7-16.

Physics

2

Scientific paper

Induction vectors, as a visualization of geomagnetic deep sounding transfer functions, display an unique pattern at the South Chilean continental margin between latitudes 38°-41°S and longitudes 71°-74°W: at long periods of approx. 3000 s their real parts are uniformly deflected from the W-E direction (which would be expected due to the coast effect and/or anomalies beneath the roughly N-S striking Andean mountain chain) to the NE. Attempts to model this behavior with simple and geologically realistic 3-D models failed, but a reasonable data fit was obtained by employing 2-D models with a structurally anisotropic, lower crust. This anisotropy hints at a deeply fractured, fluid-rich crust with a major strike direction of 40°-50° (SW-NE), oblique to the continental margin and in accordance with the regional stress field in the region of the volcanic arc. A surprising result is that the anisotropy persists in the forearc and may even reach until the continental slope near the trench.

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