A METHOD FOR THE DYNAMICAL STUDY OF THE UNDERGROUND ELECTRICAL STATE BY A NETWORK OBSERVATION OF GEOMAGNETIC VARIATIONS

A consideration is made for the practical application of Weaver's formulae and for recording separately the external and internal parts of short-period geomagnetic variations in a region of local anomaly, and the possibility for detecting the magnetic effect which might be expected from a time-change in the underground electrical state is discussed. It is shown that the effect would be very small, but it might be possible to find out the effeect on the record if we employ magnetometers of very high sensitivity and the location of anomaly is not so deep.