P. Schmoldt, PhD - MTNet - DIAS

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2. Sources for magnetotelluric recording Fig. 2.17.: Deviation of phase φ and apparent resistivity ρa curves from true values for magnetotelluric (MT) and magnetovariational (MV) data, calculated for the model shown in the inset. The responses are given in terms of the position of the recording point with respect to the line electrojet, showing the underestimation of ρa and overestimation of Φ (overestimation of the impedance Z) close to the source region and the opposite case for distances greater than the extend of the electrojet, from Kao [1984]. 28
10 1 r a (Wm) 102 10 0 0 (km) (A) (B) (d) (e) (c) (b) (a) 10 -1 10 0 10 1 10 2 10 3 T (s) 1/2 70 50 f (degrees) 90 50 (km) (d) 100 Wm 10 Wm (a) (b) (c) (e) 30 10 -1 10 1 10 2 10 3 T (s) 1/2 2.3. Deviation from plane wave assumption f (degrees) 10 2 r a (Wm) 103 10 1 (d) (e) (c) (b) (a) 10 0 10 0 10 1 10 2 10 3 T (s) 1/2 90 70 50 30 (b) (d) 0 (km) 5 (km) 500 (km) (a) 10 10 -1 10 1 10 2 10 3 T (s) 1/2 (c) 10 Wm 1000 Wm 10 Wm Fig. 2.18.: Apparent resistivity ρa and phase φ variation curves obtained over an Earth model as defined in inserts (A) and (B) for electrojets of finite length (a, b, c). Half-widths for the finite-length electrojets are assumed to be (a) 400 km, (b) 800 km, and (c) 1000 km. The dotted curve (d) corresponds to the electrojet by Peltier and Hermance [1971], whereas the dashed line (e) depicts the traditional MT response (MKS units); modified from Hutton [1972]. (e) 29
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Multidimensional isotropic and anis
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Contents 2.3. Deviation from plane
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Contents 8.3. Inversion of 3D model
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List of Figures 2.1. Amplitude of t
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List of Figures 4.17. Visual repres
Page 13 and 14: List of Figures 8.2. Ambient noise
Page 15 and 16: List of Figures 10.10.RMS misfit va
Page 17: List of Figures A.15.Result of anis
Page 20 and 21: List of Tables xviii 5.5. Parameter
Page 22 and 23: List of Acronyms FE finite element
Page 25 and 26: List of Symbols Below is a list of
Page 27 and 28: Symbol SI unit Denotation φ · pha
Page 29: Abstract The Tajo Basin and Betic C
Page 32 and 33: Publications Poster presentations x
Page 34 and 35: Acknowledgements Team, namely Colin
Page 37 and 38: Introduction 1 The Iberian Peninsul
Page 39 and 40: ections from enhanced one-dimension
Page 41: Part I Theoretical background of ma
Page 44 and 45: 2. Sources for magnetotelluric reco
Page 67 and 68: Mathematical description of electro
Page 69 and 70: yields 3.2. Deriving magnetotelluri
Page 71 and 72: 3.2. Deriving magnetotelluric param
Page 73 and 74: 3.3. Magnetotelluric induction area
Page 75 and 76: Depth d s d 1 d 2 d n-2 d n-1 t 1 t
Page 77 and 78: 3.4. Boundary conditions materials
Page 79 and 80: 3.5. The influence of electric perm
Page 85 and 86: Distortion of magnetotelluric data
Page 87 and 88: 4.1. Types of distortion Fig. 4.1.:
Page 91 and 92: J s 0 s 0 4.1. Types of distortion
Page 95 and 96: Scale Type Terminology Example Atom
Page 97 and 98: 4.1. Types of distortion the use of
Page 99 and 100: 4.2. Dimensionality Fig. 4.12.: The
Page 101 and 102: 1D 2D local 3D/1D 3D/2D regional 4.
Page 103 and 104: 4.3. General mathematical represent
Page 105 and 106: 4.4. Removal of distortion effects
Page 107 and 108: Parameter Geoelectrical application
Page 111 and 112: 4.4.5. Caldwell-Bibby-Brown phase t
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Method Applicability Swift angle 2D
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5. Earth’s properties observable
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6. Using magnetotellurics to gain i
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Part II Geology of the study area I
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7. Geology of the Iberian Peninsula
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Recovering a synthetic 3D subsurfac
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direction direction Depth: 12 - 30
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8.2. Generating synthetic 3D model
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Distance from the centre of the mes
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3D N45W 3D-crust TE Rho TE Phi Peri
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8.3. Inversion of 3D model data sch
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Model variation RMS misfit Optimal
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Profile: 3D-crust (TM-only) Depth (
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Parameter Value 8.3. Inversion of 3
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Depth (km) 10 -2 10 -1 10 0 10 1 10
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Depth (km) 10 -2 10 -1 10 0 10 1 10
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Step 1: Isotropic 2D inversion Step
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8.3. Inversion of 3D model data par
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8.4. Summary and conclusions bution
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Regularisation order Smoothing para
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S N 1% 0 Depth (km) 3% Depth (km) 1
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9.1. Profile location Data collecti
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Location (degrees) Recording period
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Geological region Stations Geologic
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9.4. Segregation of data acquired w
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Phase (degrees) 135 90 45 0 Z xy -4
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0 km 10 km 30 km 100 km 300 km Dept
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Pseudo-sections crustal strike dire
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9.8. Analysis of vertical magnetic
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9.8. Analysis of vertical magnetic
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10. Data inversion WinGLink softwar
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a (horizontal smoothing) 10. Data i
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10. Data inversion Short period ran
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10. Data inversion TM+TE Depth (km)
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10. Data inversion (a) Constrained
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10. Data inversion the model into u
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10. Data inversion Depth (km) S N 0
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Depth (km) 10. Data inversion S N 0
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10. Data inversion Group velocity m
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10. Data inversion ductivity of thi
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10. Data inversion Shtrikman upper
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10. Data inversion in the lithosphe
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10. Data inversion isotropic 2D lay
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10. Data inversion Depth (km) Depth
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10. Data inversion tigation is usua
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Depth (km) Depth (km) 10. Data inve
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Modelled Observed Modelled Observed
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Depth (km) 10. Data inversion 0 30
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10. Data inversion Depth off LAB (k
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10. Data inversion Depth (km) S 0 5
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10. Data inversion 10.3. Summary an
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10. Data inversion owing to availab
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11 Summary and conclusions The key
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11.2. PICASSO Phase I investigation
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A. Appendix Eocene 54 Ma 42 Ma 36 M
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A. Appendix A.2. Auxiliary informat
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A. Appendix 292 Fig. A.3.: Issues i
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A. Appendix A.2.4. Computation time
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296 3D-mantle profile Inversion res
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298 07-centre profile The profile 0
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300 3D-crust profile The profile 3D
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302 J-centre profile The J-centre p
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A. Appendix Anisotropy Resistivity
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A. Appendix A.4. Auxiliary figures
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A. Appendix 314 ρ TE(Ω−m) φ T
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A. Appendix 320 pic003 (off-diagona
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A. Appendix 322 pic013 (off-diagona
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Bibliography Abalos, B., J. Carrera
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Bibliography Artemieva, I. M. (2006
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Bibliography Berdichevsky, M., V. D
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Bibliography Cebriá, J.-M., and J.
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Bibliography de Vicente, G., J. Gin
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Bibliography Egbert, G. D., and J.
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Bibliography Ganapathy, R., and E.
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Bibliography Haak, V., and R. Hutto
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Bibliography Hutton, R. (1972), Som
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Bibliography Jones, A. G., and R. W
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Bibliography Kurtz, R. D., J. A. Cr
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Bibliography Lviv Centre of Institu
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Bibliography Merrill, R. T., and M.
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Bibliography Newman, G., and G. Hoh
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Bibliography Pádua, M. B., A. L. P
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Bibliography Prácser, E., and L. S
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Bibliography Ritter, J. R. R., M. J
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Bibliography Serson, P. H. (1973),
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Bibliography Spitzer, K. (2006), Ma
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Bibliography Tikhonov, A. N., and V
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Bibliography Wanamaker, B. J., and
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Bibliography Xu, Y., C. McCammon, a
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P. Schmoldt, PhD - MTNet - DIAS

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