Conductive structures under the Canadian Cordillera

Abstract

Three major structures of high electrical conductance have been mapped and investigated by means of large arrays of three-component recording magnetometers. The first array was deployed during 1980 and covered an area of 500 000 km2 at a station spacing of about 150 km, with correspondingly low resolution. This array served to locate anomalies in the magnetovariation fields, two of which were mapped and studied by means of arrays with stations 50 km apart. cach covering about 50 000 km2, during 1981. These are denoted the 1981A and 1981B arrays.