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http://cicese.repositorioinstitucional.mx/jspui/handle/1007/2034| Análisis de la transformación serie-paralelo y desarrollo de nuevos procesos para la interpretación de datos magnetotelúricos Analysis of the series and parallel trasformation, and devolepment of new processes for the interpretation of magnetotelluric data. | |
| Ricardo Guzmán Antonio Carpio | |
| JOSE MANUEL ROMO JONES ENRIQUE GOMEZ TREVIÑO | |
| Acceso Abierto | |
| Atribución | |
| Magnetoteluria,Serie-paralelo,Promedios,Sensibilidad,Datos magnetotelúricos | |
| El método magnetotelúrico la función de respuesta del subsuelo es un tensor de segundo rango. Los cuatro elementos de ese tensor son cantidades complejas que contienen la información de la resistividad y de la geometría del medio. The response function in magnetotellurics is a rank two tensor. The four elements of the impedance tensor are complex quantities that contain the information about subsurface resistivity and geometry. The series-parallel transformation (s-p), transform the original tensor into two impedances and two angular functions. The s-p impedances are a particular kind of averages of the original tensor elements. A particular property of these averages is that if applied recursively they converge to a value which is the determinant of the tensor. In this thesis I explore the usefulness of this feature to construct subsurface resistivity models. The experiments conducted show that a couple of recursions are enough to reach curves close to the determinant. Thus, the resulting models are not significantly distinct from those obtained using the determinant. The sensitivity functions of conventional TE-TM modes and that of invariant responses as s-p, recursive s-p and determinant impedances, was analyzed using simple synthetic models. In comparison with the TE-TM modes, the invariant responses are less sensitive to distant lateral effects and more sensitive to local effects beneath the observation site. The sensitivity of recursive s-p averages is not significantly different from that of the determinant. The capability of different response functions to recover a given subsurface resistivity model was investigated using 2-D inversion of profiles produced with a synthetic 3-D model. The s-p inversion and the TE-TM inversion produce similar results; both recover the model reasonably well. The determinant response produces the worst results, while the recursive s-p responses produce results of intermediate quality between those from s-p and determinant. In addition, two field data sets were analized: one of them consists of a profile along the Ojos Negros Valley, located to the east of Ensenada, and the other a profile in British Columbia, southwestern Canada, which has been used in the literature to test new processing techniques. The Ojos Negros profile runs across the main active faults in the region. It was modeled using both the s-p response functions as well as the traditional TE-TM modes. The resultant resistivity model shows a conductive zone beneath Ojos Negros valley, its top is 10-km deep and is dipping eastward to about 25 km deep. Seismic activity is concentrated in an intermediate resistivity zone (30 to 300 ohm-m) surrounding the conductive anomaly. | |
| CICESE | |
| 2009 | |
| Tesis de doctorado | |
| Español | |
| Antonio Carpio,R.G.2009.Análisis de la transformación serie-paralelo y desarrollo de nuevos procesos para la interpretación de datos magnetotelúricos.Tesis de Doctorado en Ciencias. Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California.78 pp. | |
| CIENCIAS DE LA TIERRA Y DEL ESPACIO | |
| Aparece en las colecciones: | Tesis - Ciencias de la Tierra |
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| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| 180271.pdf | Versión completa de la tesis | 5.16 MB | Adobe PDF | Visualizar/Abrir |