Artículo
Abstract:
MT data obtained at an alluvial valley in Argentina showed a strong telluric current channeling along its axis. This effect was reflected in the MT curves as a very low response for the TM apparent resistivity for periods longer than 1 s. The cause of this channeling remained unsolved although the existence of shallow conductive structures may be related to this effect. The purpose of this work is to analyze in detail the magnetotelluric response of this kind of structures. The main objectives are to identify the relevant geometrical and electrical features that cause the anomalous TM response and to study the sensitivity of the MT modes to characterize this kind of structures. Starting from a previous 2D TE inversion, we modified the structure in order to reproduce the behavior of the MT curves. 2D and 3D forward modeling of different shallow conductive structures were carried out and synthetic data from related structures were inverted using the 2D RRI code. © 2002 Elsevier Science B.V. All rights reserved.
Registro:
| Documento: | Artículo |
| Título: | Numerical simulations of the current channeling effect on MT responses due to shallow conductive structures |
| Autor: | Chao, G.; Osella, A. |
| Filiación: | Dto. Fisica-Gr. Geofis Apl., Fac. Ciencias Exactas Nat., Universidad de Buenos Aires, Buenos Aires 1428, Argentina |
| Palabras clave: | 2D forward modeling; 2D inversion; Current channeling; Magnetotelluric; Codes (symbols); Computer simulation; Data reduction; Structural analysis; Telluric prospecting; Current channeling; Geophysics; electrical resistivity; magnetotelluric method; numerical model; sedimentary basin; Antinaco-Los Colorados Valley; Argentina; La Rioja Province |
| Año: | 2003 |
| Volumen: | 52 |
| Número: | 2-3 |
| Página de inicio: | 123 |
| Página de fin: | 137 |
| DOI: | http://dx.doi.org/10.1016/S0926-9851(02)00244-6 |
| Título revista: | Journal of Applied Geophysics |
| Título revista abreviado: | J. Appl. Geophys. |
| ISSN: | 09269851 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09269851_v52_n2-3_p123_Chao |
Referencias:
- Berdichevsky, M.N., Dmitriev, V.I., Pozdnjakova, E.E., On two-dimensional interpretation of magnetotelluric soundings (1998) Geophys. J. Int., 133, pp. 585-606
- Osella, A., Favetto, A., Martinelli, P., Cernadas, D., Electrical imaging of an alluvial aquifer at the Antinaco-Los Colorados tectonic Valley in Sierras Pampeanas, Argentina (1999) J. App. Geophys., 41, pp. 359-368
- Pomposiello, C., Osella, A., Favetto, A., Sainato, C., Martinelli, P., Aprea, C., Current channeling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina (1998) Geophys. J. Int., 135, pp. 339-351
- Smith, J.T., Booker, J.R., Rapid inversion of two- and three-dimensional magnetotelluric data (1991) J. Geophys. Res., 96, pp. 3905-3922
- Wannamaker, P.E., Advances in three-dimensional magnetotelluric modeling (1991) Geophys J. R. Astron. Soc., 11, pp. 1716-1728
- Wannamaker, P.E., Hohmann, G.W., Ward, S.H., Magnetotelluric responses of three-dimensional bodies in layered earth (1984) Geophysics, 49, pp. 1517-1533
- Wu, N., Booker, J.R., Smith, J.T., Rapid two-dimensional inversion of COPROD2 data (1993) J. Geomag. Geolectr., 45, pp. 1073-1087
Citas:
---------- APA ----------
Chao, G. & Osella, A. (2003) . Numerical simulations of the current channeling effect on MT responses due to shallow conductive structures. Journal of Applied Geophysics, 52(2-3), 123-137.http://dx.doi.org/10.1016/S0926-9851(02)00244-6
---------- CHICAGO ----------
Chao, G., Osella, A. "Numerical simulations of the current channeling effect on MT responses due to shallow conductive structures" . Journal of Applied Geophysics 52, no. 2-3 (2003) : 123-137.http://dx.doi.org/10.1016/S0926-9851(02)00244-6
---------- MLA ----------
Chao, G., Osella, A. "Numerical simulations of the current channeling effect on MT responses due to shallow conductive structures" . Journal of Applied Geophysics, vol. 52, no. 2-3, 2003, pp. 123-137.http://dx.doi.org/10.1016/S0926-9851(02)00244-6
---------- VANCOUVER ----------
Chao, G., Osella, A. Numerical simulations of the current channeling effect on MT responses due to shallow conductive structures. J. Appl. Geophys. 2003;52(2-3):123-137.http://dx.doi.org/10.1016/S0926-9851(02)00244-6
