## The Magnetotelluric Method: Theory and PracticeThe magnetotelluric method is a technique for imaging the electrical conductivity and structure of the Earth, from the near surface down to the 410 km transition zone and beyond. This book forms the first comprehensive overview of magnetotellurics from the salient physics and its mathematical representation, to practical implementation in the field, data processing, modeling and geological interpretation. Electromagnetic induction in 1-D, 2-D and 3-D media is explored, building from first principles, and with thorough coverage of the practical techniques of time series processing, distortion, numerical modeling and inversion. The fundamental principles are illustrated with a series of case histories describing geological applications. Technical issues, instrumentation and field practices are described for both land and marine surveys. This book provides a rigorous introduction to magnetotellurics for academic researchers and advanced students and will be of interest to industrial practitioners and geoscientists wanting to incorporate rock conductivity into their interpretations. |

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### Contents

19 | |

References | 47 |

Earths electromagnetic environment | 50 |

3B Description of the magnetosphericionospheric sources | 96 |

The magnetotelluric response function | 122 |

References | 162 |

References | 215 |

Acknowledgements | 295 |

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3D model A. G. Jones algorithm anisotropy apparent resistivity asthenosphere Bahr bounded inﬂuence Chave components computed conductor Craton crust crustal deﬁned deﬁnite depth dimensionality distribution Earth Planet effects electric and magnetic electric ﬁeld electrical conductivity electrode electromagnetic ﬁelds electromagnetic induction elements equations errors estimate Figure ﬁnite ﬁrst ﬁt ﬂow ﬂuid frequency galvanic distortion geomagnetic Geophys Geophysics gradient horizontal impedance tensor inverse problem ionospheric Kaapvaal Craton kimberlites layer least-squares linear lithosphere M-estimators magnetic ﬁeld magnetometers magnetosphere magnetotelluric data magnetotelluric method magnetotelluric response mantle matrix Maxwell equations measurements melt misﬁt MT data MT response MT surveys noise observed oceanic olivine parameters period phase tensor proﬁle range recording regional remote reference response function response tensor result robust seaﬂoor Section signiﬁcant Slave Craton solution source ﬁeld spatial statistical strike direction structure sufﬁciently telluric tensor TM mode values variations vector vertical zero zone