Electrical Anisotropy Across the Kaapvaal Craton Derived From SAMTEX MT Studies Compared With SASE SKS Seismic Anisotropy Results

Abstract:

Data from part of the Southern African Magnetotelluric Experiment (SAMTEX) have been analysed using an impedance tensor decomposition method in order to gain a better understanding of the geoelectric directionality and dimensionality and electrical anisotropy properties of the region. The SW-NE transect from Sutherland to Messina, in South Africa is coincident with part of the Southern Africa Seismic Experiment (SASE) deployment. Shear-wave splitting observations, from SKS analyses, have been conducted on the SASE data, where it was observed that splitting delay times appear to exhibit geological control, with the Neoarchean regions showing greater anisotropy and the older Mesoarchean core in the SE exhibiting no detectable anisotropy. In contrast however to the inherent depth ambiguity with the SKS method, MT has the ability to place relatively accurate bounds on the depth at which the anisotropy …

Año de publicación:

2005

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