| Title | Controlled source electromagnetic deep sounding: theory, results and correlation with natural source results |
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| Author | Boerner, D E |
| Source | Surveys in Geophysics vol. 13, issue 4-5, 1992 p. 435-488, https://doi.org/10.1007/bf01903486 |
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| Year | 1992 |
| Alt Series | Geological Survey of Canada, Contribution Series 16891 |
| Publisher | Springer Nature |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Subjects | geophysics; mathematical and computational geology; e m surveys; electromagnetic fields; crustal studies; modelling; conductivity; computer simulations; e m interpretations |
| Illustrations | graphs; formulae; tables |
| Released | 1992 09 01 |
| Abstract | Controlled source electromagnetic (EM) methods represent a unique set of geophysical experiments which can be used to determine the properties and state of the deep continental crust. Unlike natural
source EM methods, an artificial EM source technique can be designed to optimize resolution and minimize interactions with local structure. The major drawbacks include restricted depth penetration, insufficient data sets and a limited number of
modelling algorithms. Information about the electrical conductivity at lower crustal depths can be obtained but at the expense of requiring large moment sources, sophisticated processing techniques and data redundancy. Moreover, EM data are
sufficiently complicated that numerical modelling is often necessary for quantitative interpretation. It is therefore essential to record enough information to justify the choice of interpretation algorithms, particularly since controlled source EM
forward modelling routines are generally very restrictive and not widely available. As most interpretations are based on layered earth models, observations of all the EM field components can be useful for testing the "dimensionality" of the data and
for justifying interpretations. |
| GEOSCAN ID | 215178 |
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