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oa A New Regularization Technique in Magnetotelluric Inversion
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 5th International Congress of the Brazilian Geophysical Society, Nov 1997, cp-299-00203
Abstract
The use of electromagnetic fields induced by natural sources in the ionosphere and magnetosphere to determine the electrical conductivity of the earth's subsurface has a wide range of applications in geophysics. Appearing in various areas such as petroleum prospection, rrumng and search for groundwater, this inverse problem, also known as inversion of magnetotelluric (MT) data, has special relevance in the exploration of regions which are difficult to probe with conventional seismic methods. These areas usually involve either near-surface basalt layers, which cause very strong reflections, or regions where tectonic events have disrupted the sedimentary layer geometries and greatly complicated the seismic signature (Madden and Mackie, 1989).