INVESTIGADORES
OSELLA Ana Maria
artículos
Título:
Current channeling and 3D effects detected from MT data at a sedimentary basin in Sierras Pampeanas, Argentina
Autor/es:
POMPOSIELLO, C.; OSELLA, A.,; FAVETTO, A.; SAINATO, C; MARTINELLI, PATRICIA; APREA, C
Revista:
GEOPHYSICAL JOURNAL INTERNATIONAL
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 1998 vol. 135 p. 339 - 351
ISSN:
0956-540X
Resumen:
Aquifer-bearing intermontane sedimentary basins of the Sierras Pampeanas in the
northwest of Argentina are in general very deep and narrow and contain economically
important deposits of Tertiary sediments. This paper presents the results of a study to
characterize the sedimentary basin bounded to the west by Sierra de Famatina and to
the east by Sierra de Velasco, where an electromagnetic sensing technique, the
magnetotelluric (MT) method, was applied. 12 MT sites were deployed along a 30 km
E?W transect. Some of the data collected were used to derive a 2-D resistivity model
of the basin. The model shows a subsurface trough with a thick (approximately 8 km)
sedimentary sequence above it. Anomalous behaviour of the E?W electric-field component
(Ey) was detected in the period range 1?100 s, where the amplitude of this
component was below the instrumental noise level. The cause of this anomaly is not
known, but it might be due to the presence of an embedded conducting body between
8 and 10 km, which would give rise to N?S current channelling.