Lateral heterogeneities in the upper and mid mantle conductivity in Argentina

OSELLA, A.,; FAVETTO, A.; MARTINELLI, PATRICIA

PURE AND APPLIED GEOPHYSICS

BIRKHAUSER VERLAG AG

Lugar: BASEL; Año: 1993 vol. 141 p. 139 - 156

0033-4553

Regional studies of Sq variations measured at five permanent observatories in Argentina were performed to estimate the distribution of the electrical conductivity of the upper and mid-mantle, reaching a depth of approximately 800 km. After separating the total field into its parts of external andinternal origin, the induced field was modeled, applying two-dimensional techniques. Additionally, induction arrows and an equivalent apparent resistivity curve were calculated. A north-south heterogeneity was detected, showing an increase of the conductivity of the shallower layers north of the profile,which may be related to the presence of high volcanic activity in the area.