Interpretation of the magnetotelluric impedance tensor: regional induction and local telluric distortion
Article Sidebar
Published:
Nov 5, 1987
Keywords:
MT tensor,
Static shift,
Structural dimensionality,
Separation into local and regional contributions
Volumes
Vols. 1-18 (1924-1944), ISSN 0044-2801
Main Article Content
Abstract
A method for the interpretation of the magnetotelluric (MT) impedance tensor, the telluric-vector technique, is presented. The phase information of all impedance tensor elements is used to distinguish between local telluric distortion and regional induction. A model incorporating a superposition of the effects of local surface anomalies and a regional 1-D, 2-D, or 3-D conductivity distribution is applied. In 2-D regional structures, a complete separation of the contributions of local and regional anomalies is possible if additional information from geomagnetic depth sounding (GDS) is used. A new skewness parameter derived from phases alone is introduced to measure the three-dimensionality of the regional structure independent of local distortions.
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Article Details
How to Cite
Bahr, K. (1987). Interpretation of the magnetotelluric impedance tensor: regional induction and local telluric distortion. Journal of Geophysics, 62(1), 119-127. Retrieved from https://journal.geophysicsjournal.com/JofG/article/view/129
Section
References
Bahr, K. (1983) Joint interpretation of magnetotelluric and geomagnetic data and local telluric distortions. J. Geomagn. Geoelectr. 35:555-566
Bahr, K. (1985) Magnetotellurische Messung des elektrischen Widerstandes der Erdkruste und des oberen Mantels in Gebieten mit lokalen und regionalen Leitfahigkeitsanomalien. Diss. Math.Nat. Fachb. Univ. Gottingen
Cerv, V., Pek., J., Praus, O. (1984) Models of geoelectrical anomalies in Czechoslovakia. J. Geophys. 55:161-168
Cevallos, C. (1986) Magnetotelluric interpretation - another approach. PhD thesis, Macquarie University, Sidney
Counil, J.L., Le Mouel, J.L., Menvielle, M. (1986) Associate and conjugate concepts in magnetotellurics. Ann. Geophys. 4, B2:115-130
Cox, C.S., Filloux, J.H., Gough, D.I., Larsen, J.C., Poehls, K.A., Herzen, R.P. von, Winter, R. (1980) Atlantic lithosphere sounding. J. Geomagn. Geoelectr. 32, Suppl. I, SI:13-32
Eckhardt, D.H. (1983) Geomagnetic induction in a concentrically stratified earth. J. Geophys. Res. 68:6273-6278
Eggers, D.W. (1982) An eigenstate formulation of the magnetotelluric impedance tensor. Geophysics 47:1204-1214
Gamble, T.D., Goubau, W.M., Miracky, R., Clarke, J. (1982) Magnetotelluric regional strike. Geophysics 47:932-937
Haak, V. (1972) Bestimmung der Obertragungsfunktionen in Gebieten mit lateraler Anderung der elektrischen Leitfahigkeit. Z. Geophys. 38:85-102
Jodicke, H., Untiedt, J., Olgemann, W., Schulte, L., Wagenitz, V. (1983) Electrical conductivity structure of the crust and upper mantle beneath the Rhenish Massif. In: Fuchs, K. (Ed.) Plateau uplift. Springer, Tokyo
Kemmerle, K. (1977) Magnetotellurik am Alpen-Nordrand mit Diskussion der lokalen Effekte und Darstellung einer Einzeleffekt-Auswertung. Diss. Fachb. Geowissenschaften, Munich
Larsen, J.C. (1977) Removal of local surface conductivity effects from low frequency mantle response curves. Acta Geodaet., Geophys. et Montanist. Acad. Sci. Hung. 12:183-186
LaTorraca, G.A., Madden, T.R., Korringa, J. (1986) An analysis of the magnetotelluric impedance tensor for three-dimensional structures. Geophysics 51:1819-1829
Mohr, K. (1978) Geologie und Minerallagerstatten des Harzes. Stuttgart: Schweizerbart
Schmucker, U. (1970) Anomalies of geomagnetic variations in the southwestern United States. Bull. Scripps. Inst. Ocean., Univ. Calif., 13
Schmucker, U. (1971) Neue Rechenmethoden zur Tiefensondierung. In: Weidelt, P. (Ed.) Protokoll Kolloquium Erdmagnetische Tiefensondierung, Rothenberge/Westfalen. 1-31, Geophysical Institute,
Univ. Gottingen
Schmucker, U. (1974) Erdmagnetische Tiefensondierung mit langperiodischen Variationen. In: Berktold, A. (Ed.) Protokoll Kolloquium Erdmagnetische Tiefensondierung, Grafrath/Bayern. 313-342, Geophysical Institute, Univ. Munich
Schwarz, G., Haak, V., Martinez, E., Bannister, J. (1984) The electrical conductivity of the Andean crust in northern Chile and southern Bolivia as inferred from magnetotelluric measurements. J. Geophys. 55:169-178
Swift, C.M. (1967) A magnetotelluric investigation of an electrical conductivity anomaly in the southwestern United States. Ph.D. thesis, MIT, Cambridge, MA USA
Tezkan, B. (1986) Erdmagnetische und magnetotellurische Untersuchungen auf den hochohmigen Kristallinstrukturen des Hochschwarzwaldes und des Bayerischen Waldes bei Passau. Diss. Math.-Nat. Fachb. Univ. Goettingen
Wannamaker, P.E., Hohmann, G.W., Ward, S.H. (1984) Magnetotelluric responses of three-dimensional bodies in layered earths. Geophysics 49:1517-1533
Yee, E., Paulson, K.V. (1987) The canonical decomposition and its relationship to other forms of magnetotelluric impedance tensor analysis. J. Geophys 61:173-189
Zhang, P., Roberts, R.G., Pedersen, L.B. (1987) Magnetotelluric strike rules. Geophysics 52:267-278
Bahr, K. (1985) Magnetotellurische Messung des elektrischen Widerstandes der Erdkruste und des oberen Mantels in Gebieten mit lokalen und regionalen Leitfahigkeitsanomalien. Diss. Math.Nat. Fachb. Univ. Gottingen
Cerv, V., Pek., J., Praus, O. (1984) Models of geoelectrical anomalies in Czechoslovakia. J. Geophys. 55:161-168
Cevallos, C. (1986) Magnetotelluric interpretation - another approach. PhD thesis, Macquarie University, Sidney
Counil, J.L., Le Mouel, J.L., Menvielle, M. (1986) Associate and conjugate concepts in magnetotellurics. Ann. Geophys. 4, B2:115-130
Cox, C.S., Filloux, J.H., Gough, D.I., Larsen, J.C., Poehls, K.A., Herzen, R.P. von, Winter, R. (1980) Atlantic lithosphere sounding. J. Geomagn. Geoelectr. 32, Suppl. I, SI:13-32
Eckhardt, D.H. (1983) Geomagnetic induction in a concentrically stratified earth. J. Geophys. Res. 68:6273-6278
Eggers, D.W. (1982) An eigenstate formulation of the magnetotelluric impedance tensor. Geophysics 47:1204-1214
Gamble, T.D., Goubau, W.M., Miracky, R., Clarke, J. (1982) Magnetotelluric regional strike. Geophysics 47:932-937
Haak, V. (1972) Bestimmung der Obertragungsfunktionen in Gebieten mit lateraler Anderung der elektrischen Leitfahigkeit. Z. Geophys. 38:85-102
Jodicke, H., Untiedt, J., Olgemann, W., Schulte, L., Wagenitz, V. (1983) Electrical conductivity structure of the crust and upper mantle beneath the Rhenish Massif. In: Fuchs, K. (Ed.) Plateau uplift. Springer, Tokyo
Kemmerle, K. (1977) Magnetotellurik am Alpen-Nordrand mit Diskussion der lokalen Effekte und Darstellung einer Einzeleffekt-Auswertung. Diss. Fachb. Geowissenschaften, Munich
Larsen, J.C. (1977) Removal of local surface conductivity effects from low frequency mantle response curves. Acta Geodaet., Geophys. et Montanist. Acad. Sci. Hung. 12:183-186
LaTorraca, G.A., Madden, T.R., Korringa, J. (1986) An analysis of the magnetotelluric impedance tensor for three-dimensional structures. Geophysics 51:1819-1829
Mohr, K. (1978) Geologie und Minerallagerstatten des Harzes. Stuttgart: Schweizerbart
Schmucker, U. (1970) Anomalies of geomagnetic variations in the southwestern United States. Bull. Scripps. Inst. Ocean., Univ. Calif., 13
Schmucker, U. (1971) Neue Rechenmethoden zur Tiefensondierung. In: Weidelt, P. (Ed.) Protokoll Kolloquium Erdmagnetische Tiefensondierung, Rothenberge/Westfalen. 1-31, Geophysical Institute,
Univ. Gottingen
Schmucker, U. (1974) Erdmagnetische Tiefensondierung mit langperiodischen Variationen. In: Berktold, A. (Ed.) Protokoll Kolloquium Erdmagnetische Tiefensondierung, Grafrath/Bayern. 313-342, Geophysical Institute, Univ. Munich
Schwarz, G., Haak, V., Martinez, E., Bannister, J. (1984) The electrical conductivity of the Andean crust in northern Chile and southern Bolivia as inferred from magnetotelluric measurements. J. Geophys. 55:169-178
Swift, C.M. (1967) A magnetotelluric investigation of an electrical conductivity anomaly in the southwestern United States. Ph.D. thesis, MIT, Cambridge, MA USA
Tezkan, B. (1986) Erdmagnetische und magnetotellurische Untersuchungen auf den hochohmigen Kristallinstrukturen des Hochschwarzwaldes und des Bayerischen Waldes bei Passau. Diss. Math.-Nat. Fachb. Univ. Goettingen
Wannamaker, P.E., Hohmann, G.W., Ward, S.H. (1984) Magnetotelluric responses of three-dimensional bodies in layered earths. Geophysics 49:1517-1533
Yee, E., Paulson, K.V. (1987) The canonical decomposition and its relationship to other forms of magnetotelluric impedance tensor analysis. J. Geophys 61:173-189
Zhang, P., Roberts, R.G., Pedersen, L.B. (1987) Magnetotelluric strike rules. Geophysics 52:267-278