Abstract

The seismic electric effect is the name which has been given to the variation of earth resistivity with elastic deformation. An account is given of the use of this effect in recording seismic waves. The recording circuit employs a direct current sent through the ground by means of a storage battery and spaced electrodes, and the changes in current due to seismic disturbances are recorded. An analysis of the noise appearing in the recording circuit is given and methods of reducing the noise level are described. The results of measurements on the magnitude of the effect are given, and the sensitivity obtainable with the seismic electric method is compared with that given by an electromagnetic pickup.

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