Skip to Main Content
Book Chapter

Comparison of 2-D and 3-D Models of a Magnetotelluric Survey in Southern Portugal

F. W. Jones
F. W. Jones
Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1, Canada.
Search for other works by this author on:
A. Correia
A. Correia
Department of Physics, University of Évora, Évora 7000, Portugal.
Search for other works by this author on:
January 01, 1999


We constructed 2-D and 3-D models for an areal magnetotelluric (MT) survey covering about 2500 km2 in southern Portugal. The geology is complex because the Messejana fault and the Ferreira-Ficalho overthrust intersect within the region, but it was possible to choose some profiles crossing areas that could be considered 2-D. Data from 34 measurement sites were processed and inverted for 1-D models (below each site); 2-D models were constructed from the 1-D models toward the boundary of the study area, where the geology appears to be 2-D. A 3-D electromagnetic model was constructed for the central region of the study area. Comparison of the 2-D and 3-D results shows that some of the geoelectric characteristics found in the 3-D model are not obvious, or even visible, in the 2-D results. The 2-D analysis does not give any indication of the 3-D nature of the nearby region. Furthermore, comparison between field data and the 3-D model results indicates that the main geoelectric characteristics of the region are evident in the response of the 3-D model, despite its simplicity. For this area of southern Portugal, 2-D MT profiles do not seem to present a good picture the region’s geoelectric structure.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables


Geophysical Developments Series

Three-Dimensional Electromagnetics

Society of Exploration Geophysicists
ISBN electronic:
Publication date:
January 01, 1999




A comprehensive resource of eBooks for researchers in the Earth Sciences

This Feature Is Available To Subscribers Only

Sign In or Create an Account

This PDF is available to Subscribers Only

View Article Abstract & Purchase Options

For full access to this pdf, sign in to an existing account, or purchase an annual subscription.

Subscribe Now