The Resolving Power of Geoelectric Measurements for Delineating Resistive Zones within the Crust

  1. John G. Heacock
  1. Theodore R. Madden

Published Online: 15 MAR 2013

DOI: 10.1029/GM014p0095

The Structure and Physical Properties of the Earth's Crust

The Structure and Physical Properties of the Earth's Crust

How to Cite

Madden, T. R. (1971) The Resolving Power of Geoelectric Measurements for Delineating Resistive Zones within the Crust, in The Structure and Physical Properties of the Earth's Crust (ed J. G. Heacock), American Geophysical Union, Washington D. C.. doi: 10.1029/GM014p0095

Author Information

  1. Department Of Earth And Planetary Sciences Massachusetts Institute Of Technology, Cambridge, Massachusetts 02139

Publication History

  1. Published Online: 15 MAR 2013
  2. Published Print: 1 JAN 1971

ISBN Information

Print ISBN: 9780875900148

Online ISBN: 9781118664049

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Keywords:

  • Apparent resistivity profile;
  • Delineating resistive zones;
  • Dipole-dipole configuration;
  • Geometries;
  • Magnetotelluric method;
  • Resistivity measurements;
  • Resistivity-thickness product;
  • Two-dimensional crustal model

Summary

Theoretical solutions for simple geometries and for layered mediums are examined to investigate the resolving power of surface electrical measurements for measuring crustal resistivities. It is shown that galvanic-resistivity measurements can determine only the resistivity-thickness product of the resistive zone and that magnetotelluric measurements can determine only the thickness. Neither method is practical for studying the resistive crust in areas where appreciable conductivity exists near the surface. Near-surface lateral variations are shown to give a large scatter to the measurements, but in areas of high surface resistivities one can still recognize the existence of extreme crustal resistivities, provided the resistive zone has a large enough lateral extent.