Accession Number : AD0427989

Title :   SOME REMARKS APROPOS OF PRESENTLY KNOWN MAGNETOTELLURIC INVESTIGATION AND SOUNDING CURVES,

Corporate Author : CALIFORNIA UNIV BERKELEY SPACE SCIENCES LAB

Personal Author(s) : Fournier,H. ; Ward,S. H. ; Fournier,H.

Report Date : 19 NOV 1963

Pagination or Media Count : 17

Abstract : The examination of a collection of observed magnetotelluric amplitude curves, interpreted by the Tichonov-Cagniard method, shows three tendencies: (1) For the very long periods (diurnal or nearly so), this examination indicates the presence of a very conductive layer in the Upper Mantle. This layer should be situated at various depths, depending upon the region studied, between 250 and 1100 km, in accordance with the hypothesis of Tichonov-Lipskaya. (2) It appears frequently that the curves for the two orthogonal cardinal directions, for any one location, are different or sometimes very different. (3) It seems, for the rapid periods (about one second), that if the sedimentary basis is thick, then the mean value of the magnetotelluric apparent resistivity is low; this conclusion, however, requires substantiation by more experimental information. (Author)

Descriptors :   (*GEOMAGNETISM, GEOPHYSICS), STRATIGRAPHY, GEOLOGY, DIURNAL VARIATIONS, SEDIMENTARY ROCK

Distribution Statement : APPROVED FOR PUBLIC RELEASE