抄録
We showed in the past how the anomalous magnetic fields in the Rhine Graben can be interpreted by induction in elongated sedimentary conductive layers (DUPIS and THERA, 1982); these layers existence was confirmed by magnetotelluric (M. T.) soundings and by electrical logs. The problem is different for the Northern Pyrénées because of a lack of petroleum logs and of a significant number of M. T. soundings. The model developed in this paper is the result of a geological interpretation from a geological map, complemented by electrical soundings, M. T. soundings and DGS (differential geomagnetic sounding) information. It shows that the results obtained for the anomalous magnetic field (BABOUR and MOSNIER, 1979) and first interpreted as due to “channelling currents”, are perfectly described by the effect of induction in local structures.
